1. If 3y + x > 2
and x + 2y≤3, What can be said about the value of y?
A. y = -1
B. y >-1
C. y <-1
D. y = 1
Answer: B
Multiply the second equation with -1 then it
will become - x - 2y≥ -
3. Add the equations. You will get y > -1.
2. If the price of an item is decreased by 10%
and then increased by 10%, the net effect on the price of the item is
A. A decrease of 99%
B. No change
C. A decrease of 1%
D. An increase of 1%
Answer: C
If a certain number is increased by x% then
decreased by x% or vice versa, the net change is always decrease. This
change is given by a simple formula −(x10)2= −(1010)2= −1%.
Negitive sign indicates decrease.
3. If m is an odd integer and n an even integer,
which of the following is definitely odd?
A. (2m+n)(m-n)
B. (m+n2)+(m−n2)
C. m2+mn+n2
D. m +n
Answer: C and D (Original Answer given as D)
You just remember the following odd ± odd
= even; even ± even = even; even ±odd
= odd
Also odd x odd = odd; even x even = even; even x
odd = even.
4. What is the sum of all even integers between 99 and 301?
A. 40000
B. 20000
C. 40400
D. 20200
Answer: D
The first even number after 99 is 100 and last
even number below 301 is 300. We have to find the sum of even numbers
from 100 to 300. i.e., 100 + 102 + 104 + ............... 300.
Take 2 Common. 2 x ( 50 + 51 +
...........150)
There are total 101 terms in this series.
So formula for the sum of n terms when first term and last term is known
is n2(a+l)
So 50 + 51 + ...........150 = 1012(50+150)
So 2 x 1012(50+150) =
20200
5. There are 20 balls which are red, blue or green. If 7 balls are green
and the sum of red balls and green balls is less than 13, at most how many red
balls are there?
A. 4
B. 5
C. 6
D. 7
Answer: B
Given R + B + G = 17; G = 7; and R + G < 13.
Substituting G = 7 in the last equation, We get R < 6. So
maximum value of R = 6
6. If n is the sum of two consecutive odd
integers and less than 100, what is greatest possibility of n?
A. 98
B. 94
C. 96
D. 99
Answer : C
We take two odd numbers as (2n + 1) and (2n - 1).
Their sum should be less than 100. So (2n + 1) +
(2n - 1) < 100 ⇒ 4n < 100.
The largest 4 multiple which is less than 100 is
96
7. x2 <
1/100, and x < 0 what is the highest range in which x can lie?
A. -1/10 < x < 0
B. -1 < x < 0
C. -1/10 < x < 1/10
D. -1/10 < x
Answer: A
Remember:
(x - a)(x - b) < 0 then value of x lies in
between a and b.
(x - a)(x - b) > 0 then value of x does not
lie inbetween a and b. or ( −∞,
a) and (b, −∞)
if a < b
x2 <
1/100 ⇒
(x2−1/100)<0⇒(x2−(1/10)2)<0⇒(x−1/10)(x+1/10)<0
So x should lie inbetween - 1/10 and 1/10.
But it was given that x is -ve. So x lies in -1/10 to 0
8. There are 4 boxes colored red, yellow, green and blue. If 2
boxes are selected, how many combinations are there for at least one green box
or one red box to be selected?
A. 1
B . 6
C. 9
D. 5
Answer: 5
Total ways of selecting two boxes out of 4 is 4C2 = 6. Now, the number of ways of selecting two boxes
where none of the green or red box included is only 1 way. (we select
yellow and blue in only one way). If we substract this number from total
ways we get 5 ways.
9. All faces of a cube with an eight - meter
edge are painted red. If the cube is cut into smaller cubes with a two -
meter edge, how many of the two meter cubes have paint on exactly one face?
A. 24
B. 36
C. 60
D. 48
Answer : A
If there are n cubes lie on an edge, then total
number of cubes with one side painting is given by 6×(n−2)2.
Here side of the bigger cube is 8, and small cube is 2. So there are 4
cubes lie on an edge. Hence answer = 24
10. Two cyclists begin training on an oval racecourse at the same time.
The professional cyclist completes each lap in 4 minutes; the novice takes 6
minutes to complete each lap. How many minutes after the start will both
cyclists pass at exactly the same spot where they began to cycle?
A. 10
B. 8
C. 14
D. 12
Answer: D
The faster cyclyst comes to the starting point
for every 4 min so his times are 4, 8, 12, ......... The slower cyclist
comes to the starting point for every 6 min so his times are 6, 12, 18,
......... So both comes at the end of the 12th min.
11. M, N, O and P are all different individuals; M is the daughter of N; N is
the son of O; O is the father of P; Among the following statements, which one
is true?
A.
M is the daughter of P
B. If B is the daughter of N, then M and B are
sisters
C. If C is the granddaughter of O, then C and M
are sisters
D. P and N are bothers.
Answer: B
From the diagram it is clear that If B is the
daughter of N, then M and B are sisters. Rectangle indicates Male, and
Oval indicates Female.
12.
In the adjoining diagram, ABCD and EFGH are squres of side 1 unit such that
they intersect in a square of diagonal length (CE) = 1/2. The total area
covered by the squares is
A. Cannot be found from the information
B. 1 1/2
C. 1 7/8
D. None of these
Answer: C
Let CG = x then using
pythogerous theoremCG2+GE2=CE2
⇒ x2+x2=(1/2)2⇒2x2=1/4⇒x2=1/8
Total area covered by two bigger squares = ABCD
+ EFGE - Area of small square = 2 - 1/8 = 15/8
13.
There are 10 stepping stones numbered 1 to 10 as shown at the side. A fly
jumps from the first stone as follows; Every minute it jumps to the 4th stone
from where it started - that is from 1st it would go to 5th and from 5th it
would go to 9th and from 9th it would go to 3rd etc. Where would the fly
be at the 60th minute if it starts at 1?
A.
1
B. 5
C. 4
D. 9
Answer : A
Assume these steps are in circular
fashion.
Then the fly jumps are denoted in the
diagram. It is clear that fly came to the 1st position after 5th
minute. So again it will be at 1st position after 10th 15th .....60th.
min.
So the fly will be at 1st stone after 60th min.
14. What is the remainder when 617+1176
is divided by 7?
A. 1
B. 6
C. 0
D. 3
Answer: C
617 = (7−1)17 =
17C0.717−17C1.716.11.....+17C16.71.116−17C17.117
If we divide this expansion except the last term
each term gives a remainder 0. Last term gives a remainder of - 1.
Now From Fermat little theorem, [ap−1p]Rem=1
So [1767]Rem=1
Adding these two remainders we get the final
remainder = 0
15. In base 7, a number is written only using
the digits 0, 1, 2, .....6. The number 135 in base 7 is 1 x 72 + 3 x 7 + 5 = 75 in base 10. What is the sum of the
base 7 numbers 1234 and 6543 in base 7.
A. 11101
B. 11110
C. 10111
D. 11011
Answer: B
In base 7 there is no
7. So to write 7 we use 10. for 8 we use 11...... for 13 we use 16,
for 14 we use 20 and so on.
So from the column d, 4 + 3 = 7 = 10, we write 0
and 1 carried over. now 1 + 3 + 4 = 8 = 11, then we write 1 and 1 carried
over. again 1 + 2 + 5 = 8 = 11 and so on
16. The sequence {An} is defined by A1 =
2 and An+1=An+2n what
is the value of A100
A. 9902
B. 9900
C. 10100
D. 9904
Answer: A
We know that A1 = 2 so A2=A1+1=A1+2(1)=4
A3=A2+1=A2+2(2)=8
A4=A3+1=A3+2(3)=14
So the first few terms are 2, 4, 8, 14, 22,
......
The differences of the above terms are 2, 4, 6,
8, 10...
and the differences of differences are 2, 2, 2,
2. all are equal. so this series represents a quadratic equation.
Assume An = an2+bn+c
Now A1 =
a + b + c = 2
A2 =
4a + 2b + c = 4
A3 =
9a + 3b + c = 8
Solving above equations we get a = 1, b = - 1
and C = 2
So substituting in An = n2+bn+c = n2−n+2
Substitute 100 in the above equation we get
9902.
17.Find the number of rectangles from the
adjoining figure (A square is also considered a rectangle)
A. 864
B. 3276
C. 1638
D. None
Answer: C
To form a rectangle we need two horizontal lines
and two vertical lines. Here there are 13 vertical lines and 7 horizontal
lines. The number of ways of selecting 2 lines from 13 vertical lines is 13C2 and
the number of ways of selecting 2 lines from 7 horizontals is 7C2.
So total rectangles = 7C2x13C2
18. A, B, C and D go for a picnic. When A
stands on a weighing machine, B also climbs on, and the weight shown was 132
kg. When B stands, C also climbs on, and the machine shows 130 kg.
Similarly the weight of C and D is found as 102 kg and that of B and D is 116
kg. What is D's weight
A. 58kg
B. 78 kg
C. 44 kg
D. None
Answer : C
Given A + B = 132; B + C = 130; C + D = 102, B +
D = 116
Eliminate B from 2nd and 4th equation and
solving this equation and 3rd we get D value as 44.
19. Roy is now 4 years older than Erik and
half of that amount older than Iris. If in 2 years, roy will be twice as
old as Erik, then in 2 years what would be Roy's age multiplied by Iris's age?
A. 28
B. 48
C. 50
D. 52
Answer: 48
20. X, Y, X and W are integers. The
expression X - Y - Z is even and the expression Y - Z - W is odd. If X is
even what must be true?
A. W must be odd
B. Y - Z must be odd
C. W must be odd
D. Z must be odd
Answer: A or C (But go for C)
21. Mr and Mrs Smith have invited 9 of
their friends and their spouses for a party at the Waikiki Beach resort.
They stand for a group photograph. If Mr Smith never stands next to Mrs
Smith (as he says they are always together otherwise). How many ways the group
can be arranged in a row for the photograph?
A. 20!
B. 19! + 18!
C. 18 x 19!
D. 2 x 19!
Answer: C
22. In a rectanglular coordinate system,
what is the area of a triangle whose vertices whose vertices have the
coordinates (4,0), (6, 3) adn (6 , -3)
A. 6
B. 7
C. 7.5
D. 6.5
Answer: A
23. A drawer holds 4 red hats and 4 blue
hats. What is the probability of getting exactly three red hats or
exactly three blue hats when taking out 4 hats randomly out of the drawer and
immediately returning every hat to the drawer before taking out the next?
A. 1/2
B. 1/8
C. 1/4
D. 3/8
Answer: B
24. In how many ways can we distribute 10 identical looking pencils to 4
students so that each student gets at least one pencil?
A. 5040
B. 210
C. 84
D. None of these
Answer: C
25. The prime factorization of intezer N is A x A x B x C, where A, B and C are
all distinct prine intezers. How many factors does N have?
A. 12
B. 24
C. 4
D. 6
Answer: A
26. Tim and Elan are 90 km from each other.they
start to move each other simultanously tim at speed 10 and elan 5 kmph. If
every hour they double their speed what is the distance that Tim will pass
until he meet Elan
A. 45
B. 60
C. 20
D. 80
Answer: B
27. A father purchases dress for his three
daughter. The dresses are of same color but of different size .the dress is
kept in dark room .What is the probability that all the three will not choose
their own dress.
A. 2/3
B. 1/3
C. 1/6
D. 1/9
Answer: B
28. N is an integer and N>2, at most how many
integers among N + 2, N + 3, N + 4, N + 5, N + 6, and N + 7 are prime
integers?
A. 1
B. 3
C. 2
D. 4
Answer: C
29. A turtle is crossing a field. What is
the total distance (in meters) passed by turtle? Consider the following two
statements
(X) The average speed of the turtle is 2 meters per minute
(Y) Had the turtle walked 1 meter per minute faster than his average speed it
would have finished 40 minutes earlier
A. Statement X alone is enough to get the answer
B. Both statements X and Y are needed to get the
answer
C. Statement Y alone is enough to get the answer
D. Data inadequate
Answer: B
30. Given the following information, who is
youngest?
C is younger than A; A is talled than B
C is older than B; C is younger than D
B is taller than C; A is older than D
A. D
B. B
C. C
D. A
Answer: B
31. If P(x) = ax4+bx3+cx2+dx+e has
roots at x = 1, 2, 3, 4 and P(0) = 48, what is P(5)
A. 48
B. 24
C. 0
D. 50
Answer: A
Saturday, 15 September 2012
1. Find X^y+y^x=46. Find X and Y values?
2. 3 white chips, 7 blue chips, 16 green chips, 2 chips drawn from the box in
succession what is the probability that one is blue and other is white?
a) 7/50 b) 8/30 c) 7/25 d) 20/26
3. If a person has to work 8 continuous day & he gets a rest on the 9th
day. If a person starts on Monday. What is the day of 12th rest day?
4. How many liters of a 90% of concentrated acid needs to be mixed with a 75%
solution of concentrated acid to get a 30 liter solution of 78% concentrated
acid?
a) 8 b)9 c) 7 d)6
5. 3 cars A, B & C are in the race. A is twice as likely to win as B and B
is thrice as likely to win as C. what is probability that B will win, if only
one can win the race ?
a) ½ b) 2/5 c) 3/10 d) 1/10
6. A cow & Horse brought for Rs.2000. The cow is sold at a profit of 20%
and the Horse is sold at a loss of 10%. Of The overall gain is Rs.40. The cost
price of the cow is :
a) 700 b) 800 c) 1200 d) 1300
7. The sum of 3 consecutive numbers of the four numbers A, B, C, D are
4613,4961,5010,5099 then what is the largest number among A,B,C,D ?
a) 1948 b) 1463 c) 1601 d) 1550
8. George printing press can print an edition of newspapers in 12 hours while
Paul’s press can print the same edition in 18 hours. What is the total no. of
hours the press working together but independent of one another to print the
same edition?
a) 15 b) 17.4 c) 7 d) 7.2
9. 87th number in the series 2, 10, 26, 50…….
10. 70, 54, 45, 41……. What is the next number in the given series?
11. If the sum of the numbers in each row column, diagonal are same then find
the value of (Y+Z)
12. If the sum of the numbers in each row column, diagonal are same then find
the value of (Y+Z)
13. In the simple subtraction problem Below , sum single digits (not
necessarily distinct) are replace by letters , find the value of 7*A + 7*B +6*C*D
A 7 C 2
- 4 B 6 8
--------------
5 4 3 D
a) 77 b) 95 c) 84 d) 70
14. How many polynomial functions f of degree >=1 satisfy f(X2) = (f(X)) 2
=f (f(X)).
a) 1 b) 0 c) 2 d) more than 2
15. What is the remainder when 50! (50 factorial ) is divided by 16 ^ 15 (1615)
Answer is: 1
16. 1,5,6 ,25, 26,30,31, 125,126,130,131,150,151,155,156,…………………
What is the value of 30th term in the given series?
a) 781 b) 3125 c) 776 d) 780
17. The climb from foot to top of a hill 800 meters, Jack can climb at 16
meters per minute and rests for two minutes or 20meters per 2 minutes and rest
for one minute. Paul can climb at 10 meters per one minute and rest for one
minute or
16 meters per minute and rest for 2 minutes. If take has to reach the top in
exactly two hours. What is the maximum number of rests that he can take?
a) 41 b) 42 c) 40 d) 43
18. If the 20th term of an AP=560 and 30th term of AP=840 then what is the sum
of 5th term and 40th term of the series.
a) 1450 b) 1560 c) 1260 d) 1340
19. Raj tossed 3 dices and there results are noted down then what is the
probability that raj gets 10?
a) 1/72 b) 1/9 c) 25/216 d)1/8
20. The diagonal of a square is twice the side of equilateral triangle the
ratio of Area of the Triangle to the Area of Square is?
a) √3:8 b) √2:5 c) √3:6 d) √2:4
21. Apple costs L rupees per kilogram for first 30kgs and Q rupees per kilogram
for each additional kilogram. If the price of 33 kilograms is 11.67and for
36kgs of Apples is 12.48 then the cost of first 10 kegs of Apples is
a) 3.50 b) 10.53 c) 1.17 d)2.8
22. 1,2,2,3,3,3,4,4,4,4,1,1,2,2,2,2,3,3,3,3,3,3,4,4,4,4,4,4,4,4,…………………………………..
Then what is the 2532 position of the number in the sequence?
a) 2 b) 1c) 3 d) 4
23.
1,2,2,3,3,3,4,4,4,4,1,1,2,2,2,2,3,3,3,3,3,3,4,4,4,4,4,4,4,4,…………………………………..
Then what is the 2320 position of the number in the sequence?
b) 2 b) 1c) 3 d) 4
24. How many 7’s are there between 0 to 400?
25. The letters in the word ABUSER are permuted in all possible ways and
arranged in alphabetical order then find the word at position 49 in the
permuted alphabetical order?
a) ARBSEU
b) ARBESU
c) ARBSUE
d) ARBEUS
26. The letters in the word TALION are permuted in all possible ways and
arranged in alphabetical order then find the word at position 33 in the
permuted alphabetical order?
27. The letters in the word SHOVEL are permuted in all possible ways and
arranged in alphabetical order then find the word at position 31 in the
permuted alphabetical order?
28. 15 students join a summer course. Every day 3 students are on duty after
school to clean the class rooms. After the course, it was found that every pair
of students has been on duty exactly once. How many days does the course last
for?
a) 35 b) 45 c) 105 d)none of these
29. Consider all permutations (i.e., arrangements) of digits 1, 2&3. We
will say that a hit has been scored if at least one digit occurs in its proper
position in the permutation. If 1 (one) occurs in the first position or 2 in
the second position or 3(three) in the 3rd position in how many ways of these
permutations is a hit scored?
a) 4 b) 1 c) 2 d) 3
30. If the word MONOS is permuted then the probability that O’s never come
together?
31. Next number in the given series 1, 7, 8, 49, 50, 56, 57, 343,
#First of all I want to clearly mention that
tcs has changed its whole question bank as well as the question set. So ull 99%
not be getting what u all are studying from the net ie the previous questions.
Id request you to go thru them as well but the questions i am posting are
equally important.
#The pattern is 80 mins and now 30 questions.
Q1. (#M40010866) TCS
aptitude question geometry
Q2. MOTHER
+DAUGHTER+INFANT AGE IS 74. MOTHER AGE IS 46 MORE THEN DAUGHTER AND INFANT. AND
INFANT AGE IS 0.4 OF DAUGHTER. FIND DAUGHTERS AGE.
Q3. SOME
CARDS QUESTION. PROBABILITY OF 1 ACE WHICH IS RED AND ONE SPADE. SOMETHING LIKE
THIS. DO GO THRU THE CARDS QUES. THE DECKS AND EVERYTHING.
Q4.THERE ARE
EXACTLY 4 THURSDAYS AND 4 SUNDYS IN A MONTH OF 31. FIND THE FIRST DAY. MY ANS
WAS SHAYD MONDAY. U CAN CALCULATE EASILY.
Q5. THEN
THERE WERE 2-3 QUESTIONS BASSED ON SPEED AND DISTANCE. EASY ENOUGH. ULL BE ABLE
TO MANAGE THEM.
ONE WAS LIKE
2 CARS START FROM A POINT X. CAR1 START AT 10 AM AND CAR2 AT SOME
TIME. BOTH THE CARS GO TILL THEY REACH A T POINT. ONE TAKES LEFT OTHER RIGHT.
IT WAS TO BE FOUND OUT HOW MUCH WAS THE DISTANCE BETWEEN THE 2 CARS
AT 2 PM.
Q6. ANOTHER
TIME DISTANCE, A PERSON RUNS AROUND A RECTANGULAR FIELD. TIME GIVEN SPEED
GIVEN. FIND THE DISTANCE. APPLY PERIMETER FORMULA 2(Length+breadth). And length
and breadth ratio given. Find area.
Q7.THEN
THERE WAS A SERIES COMPLETION QUESTION.
7^0,7^1 , 7^1+7^0,7^2… SOMETHING LIKE THIS
BUT I WAS NOT ABLE TO SOLVE IT SOME ERRORENOUS DETAILS WERE TPRESENT
Q8 THREE GROUPS :: X1,X2,X3
A,B COMMON TO ALL THREE. THEN ATLEAST 1 ELEMNT COMMON TO 2 IE
X1,X2,X2,X3,X3,X1. FINDMINIMUM ELEMENTS IN EACH GROUP. ANSWER IS 4.
Q9. U PEOPLE PROBABLY MUST HAVE DONE THE OPENSEESAME SAMPLE PAPER.
THERE WAS 1 FLY QUESTION THERE. IT JUMPS AT EVEY TICK 4 STEPS. THERE WAS A
SIMILAR QUESTION AND THE INSECT WAS JUMPING IN A CIRCULAR QUESTIONS.
Q10. Now A NEW ELEMENT.
THERE WERE2-3 VISUALIZING QUESTIONS ALSO.
A CUBE WAS GIVEN IN 1D. WITH DOTTED LINES. FACE WERE MARKED. WITH 1
FACE AS X. U HAD TO TELL THAT WHAT WILL BE FACE OPPOSITE X WHEN IT IS FOLDED AS
A CUBE.
Q11:
DI QUES
THERE WERE ATLEAST 6-7 QUESTIONS
LINES WERE GIVEN TO INTERPRET. WHOLE LOT OF LINES THEN WE HAD
TO ANSWER 1 QUESTION BASED ON THE CONCLUSION
SOMETHING LIKE THIS(THIS QUES IS JUST A SAMPLE)
Directions for
Q. 1 to Q. 5: Refer the data:
J, K, L, M and N collected stamps. They collected a total of 100 stamps. None
of them collected less than 10.
No two among them collected the same number.
(i) 3 collected the same number as K and M together.
(ii) L collected 3 more than the cube of an integer
(iii) The no. collected by J was the square of an integer.
(iv) Total no. collected by K was either the square or cube of an integer.
1. The no. collected by J was:
(1) 27 (2) 49 (3) 36 (4) 64
2. The no. collected by K was:
(1) 16 (2) 27 (3) 25 (4) 36
3. The difference of numbers collected by L
& M was:
(1) 3 (2) 2 (3) 5 (4) 9
THAT’S ALL FROM MY SIDE.ILL TRY TO POST YOU
MORE IF I CAN GET HOLD OFF.
MY ADVICE:
1. TRY TO DO ALL THE SMALL QUESTIONS FIRST.
DNT WASTE MUCH TIME ON THE DI LIKE QUES 11.
2 THE TEST IS NEW AND TOUGH SO CUTOFF WILL
BE LESS. I MYSELF ATTEMPTED ONLY 20 QUESTIONS, SO TRY NOT TO PUT ANY BLIND
GUESSES.
MY
BEST WISHES.
Thursday, 13 September 2012
Recent
Question Pattern of TCS Campus Placement 2013. It is the very first version we
found.
The answers of these question is given at d bottom. And if there is any other
questions let us know & if we have we’ll let you know.
1. An empty tankbe filled with aninlet pipe ‘A’ in 42 minutes. after 12 minutes
an outlet pipe ‘B’ is opened which can empty the tank in 30 minutes. After 6
minutes another inlet pipe
‘C’ opened
into the same tank, which can fill the tank in 35 minutes and the tank is
filled find the time taken to fill the tank?
2. A boy wants to make cuboids of dimension 5m,6m & 7m from small cubes of
.03m^3.Later he realized that he can make some cuboids by making it hollow.Then
it takes some cubes less.What is the number of cubes to be removed
a)2000 b)5000 c)3000 d)7000
3. Leena cuts small cubes of 3 cubic cm each.She joined it to make a cuboid of
length 10 cm,width 3cm, and depth 3 cm.How many more cubes does she need to
make a perfect cube?
a)910 b)250 c)750 d)650
4. What is the distance between the z-intercept from x-intercept in the eqn
ax+by+cz+d=0
5. 10 men and 10 women are there.They dance with each other.Is there
possibility that two men are dance with same girl and vice versa?
a)22 b)20 c)10 d)none of these
6. A father purchases dress for his three daughter. The dresses are of same
color but of different size .the dress is kept in dark room .What is the
probability that all the three will not choose their own dress…
a) 2/3 b) 1/3 c) 1/6 d) 1/9
7. Mr and Mrs smith had invited 9 of their friend and their spouses for party
at wiki beachresort.the stand for group photograph if mr smith never stand next
to mrs smith then how many way group arrange in row.
(A)20!(B)19!+18!(C)18*19!(D)2*19!
8. Tim and Elan are 90 km from each other, they start to move each other
simultaneously, Tim at speed 10 and Elan 5kmph, if every hour they double their
speed what is the distance that Tim will pass until he meet Elan?
(A)45(B)60(C)20(D)80
9. MOTHER +DAUGHTER+INFANT AGE IS 74. MOTHER AGE IS 46 MORE THEN DAUGHTER AND
INFANT.
AND INFANT AGE IS 0.4 OF DAUGHTER. FIND DAUGHTERS AGE.
10. The age of two people is in the ratio 6:8. the sum of their ages is 77.
after 2 years the ratio of their ages becomes 5:7. wat is their present age?
11. A Grocer bought 24 kg coffee beans at price X per kg. After a while one
third of stock got spoiled so he sold the rest for $200 per kg and made a total
profit of twice the cost. What must be the price of X?
$33 1/3 B. 66 2/3 C.44 4/9 D.50 1/3
12. Let exp(m,n) = m to the power n. If exp(10, m) = n exp(2, 2) where to and n
are integers then n = ………………?
13. Bhanu spends 30% of his income on petrol on scooter. ? of the remaining on
house rent and the balance on food. If he spends Rs.300 on petrol then what is
the expenditure on house rent?
14. Directions for Q. 1 to Q. 5: Refer the data:
J, K, L, M and N collected stamps. They collected a total of 100 stamps. None
of them collected less than 10.
No two among them collected the same number.
(i) 3 collected the same number as K and M together.
(ii) L collected 3 more than the cube of an integer
(iii) The no. collected by J was the square of an integer.
(iv) Total no. collected by K was either the square or cube of an integer.
1. The no. collected by J was:
(1) 27 (2) 49 (3) 36 (4) 64
2. The no. collected by K was:
(1) 16 (2) 27 (3) 25 (4) 36
3. The difference of numbers collected by L & M was:
(1) 3 (2) 2 (3) 5 (4) 9
15. A,B COMMON TO ALL THREE. THEN ATLEAST 1 ELEMNT COMMON TO 2 IE
X1,X2,X2,X3,X3,X1.
FIND MINIMUM ELEMENTS IN EACH GROUP.
16. How many kgs. of wheat costing Rs. 8 per kg must be mixed with 86 kg of
rice costing Rs. 6.40 per kg so that 20% gain may be obtained by Belling the
mixture at Rs. 7.20 per kg ?
17. The diagonal of a square is twice the side of equilateral triangle the
ratio of Area of the Triangle to the Area of Square is?
a) √3:8 b) √2:5 c) √3:6 d) √2:4
18. Raj tossed 3 dices and there results are noted down then what is the
probability that raj gets 10?
a) 1/72 b) 1/9 c) 25/216 d)1/8
19. 16 meters per minute and rest for 2 minutes. If take has to reach the top
in exactly two hours. What is the maximum number of rests that he can take?
a) 41 b) 42 c) 40 d) 43
20. length of minute hand is 5.4 cm, area covered by this in 10 min is ?
a)50.97 b)57.23 c)55.45 d)59.14
21. The climb from foot to top of a hill 800 meters, Jack can climb at 16
meters per minute and rests for two minutes or 20meters per 2 minutes and rest
for one minute. Paul can climb at 10 meters per one minute and rest for one
minute or16 meters per minute and rest for 2 minutes. If take has to reach the
top in exactly two hours. What is the maximum number of rests that he can take?
a) 41 b) 42 c) 40 d) 43
22. there r three buckets..of 8,5 n 3 litres…out of which only 8 ltr bucket is
fully filled…u hv to fill exact 4-4 ltr liquid in 8 and 5 litre bucket by using
only these buckets in minimm num of steps…..
23. A number has exactly 3 prime factors, 125 factors of this number are
perfect squares and 27 factors of this number are perfect cubes. overall how
many factors does the number have???
24. there are two boxes,one containing 39 red balls & the other containing
26 green balls.you are allowed to move the balls b/w the boxes so that when you
choose a box random & a ball at random from the chosen box,the probability
of getting a red ball is maximized.this maximum probability is
a)60 b)50 c)80 d)30
25. A dog taken four leaps for every five leaps of hare but three leaps of the
dog is equal to four leaps of the hare. Compare speed?
26. The milk and water in two vessels A and B are in the ratio 4 : 3 and 2: 3
respectively. In what ratio, the liquids in both the vessels be mixed to obtain
a new mixture in vessel C containing half milk and half water?
27. In what ratio must water be mixed with milk to gain 20 % by selling the
mixture at cost price?
28. x=(sin nx/n)=?
29. How much water must be added to 60 litres of mixture of milk? 1 ½ litres of
milk for Rs. 20. So as to have a mixture worth Rs.10⅔ a litre ?
30. Find the no of zeros in the product of 1^1*2^2*3^3*…..*49^49?
31. N is an integers and N>2 at most how many integers among N+2,N+4,N+5,N+6
and N+7 are prime integers?
a) 1 ,b)3 ,c)2, d)4
32. The sequence {A(n)} is defined by A(1)=2 and A(n+1)=A(n)+2n. What is the
value of A(100).
33. n! has 13 zeros than wat is the higest and lowest value of n??
CAUTION
: CAN NOT Be CONSIDERED to be legit :P , SOURCE : AS AVAILABLE OVER THE
INTERNET
In
SRM University .. the apti ques were totally
different frm rest of other col gets nt even single ques of other col guys got
... don't depend on new pattern or old pattern ...prepare both ... so guys
prepare well .....some of the ques dt was asked in SRW r....
1.f(n) is a
function...where f(f(n))+f(n)=2n+3.
f(n)=0;find f(2012)
2.one man
can do fill the truck in 9 min; how many truck can be filled in one and half
hours when 16 men work together?
3.what is
the probability of throwing 3 dices to get a sum of 10?
4.wat s 1st
of jan.. when it has 4 thursdays and 4 sundays in that month?
5.in six
yrs, raj father's age is twice raj's age. before 2 yrs raj mother's age is
twice as raj's age. raj age is 25 years ... 3 yrs from now.. wat is sum of
raj's parents age?
6.1-2,2-3,3-4,....-98+99=?
will
try to post other questions soon....ALL THE BEST GUYS TRY HARD SURE U LL..!!
Some
sample TCS questions which came yesterday in GCE, Aurangabad:
1.there are
4 exactly Sunday and 4 Thursday in the month of 31 days.so find the 1st day of
tht month.
2.sum of 2
no is 50 and sum of there reciprocal is 1/12. So find these number.
3 there was
1 Q based on critical reasoning.
4. I had 6
-7 Q on time and work,time and distance, probability, ages. But don’t remember
it nw.
5. I don’t
remember the exact value. But the Q was-
Wht
should be added in 6440 that is when divided by 460 gives reminder
35.
7.Arun was
all bent on building a new house. He carefully got the blue print of his house
designed buy his friend Ashwin, a civil engineer. He wanted to build a room of
dimension 27 by 48 ft and lay tiles in this room. Each tile was of dimension 2
by 3 ft. How many tiles should Arun buy?
216
8.Father is
aged three times more than his son Ronit. After 8 years, he would be two and a
half times of Ronit's age. After further 8 years, how many times would he be of
Ronit's age? a.2 b.5/2 c.3/2 d.1
Ans A)2
times.
Given
F=3S+S=4S ----(1)
F+8=5/2(S+8)----(2)
By
Substituting F=4S in (2) We get S=8
Therefore
F=32.
Since After
16 years,F=48,S=24
So Father's
age after 16 years is 2 times of Son's age.
9.Roy is now
4 year older than Erik and half of that amount than Lewis.If in two years Roy
will be twice as old as Erick,then in two year what would be Roy age multiplied
by Lewis age??
ans is 48
firstly two
equation from 1st sentence ..
suppose
roy=x, erik=y, lewis=z
so
x=y+4....(1)
2nd is
x=z+2...(2) (Roy is now 4 year older than Erik and half of that amount than
Lewis so 4/2=2)
also after 2
years erik and roy relation wil b
x+2=2(y+2)..
(3)
so put this
into 1st equ. u will get y=2..
and then
x=6,z=4(by substituting other)
nw asking
multiplication after two years of roy n lewis is (6+2)*(4+2)=48..
10.If there
are maximum acute angles then how many convex hectagons are there?
11.if a
divided by 5,3,2 respectively give the remainder 1,2,0.what is the no when
is divided by 2 3, 5
number
12.How many
polygon function of degree less than equal to 1 satisfy f(x)^2={f(n)^2={f{f(x))
13.The
number of bacteria was growing in a city exponentially.at 4 pm yesterday , the
number of bacteria was 400 and at 6 pm yesterday it was 3600.How many bacteria
were there at 7pm yesterday?
10800
14.maximun
number of identical pieces(of same size) of a cake by making only 3 cuts? -6
15.Find the
area (in square units) of the triangle formed by 2x+3y=5, y=x and X-Axis.
the points
of intersection for lines:
2x+3y=5 and
x=y => 5x=5 => x=1 and y=1 =>(1,1)
x=y and
y=0(x-axis) => x=0 and y=0 =>(0,0)
2x+3y=5 and
y=0(x-axis) => 2x=5 => x=5/2 and y=0 =>(5/2,0)
area of triangle
with vertices (x1,y1),(x2,y2),(x3,y3) is
|x1(y2-y3)+x2(y3-y1)+x3(y1-y2)|/2
=|1(0-0)+0(0-1)+5/2(1-0)|/2
=|1+5/2|/2
=7/4 sq
units...
16.The ratio
of perimeter of an equilateral triangle having an altitude equal to the radius
of the circle, to the perimeter of an equilateral triangle inscribed in that
circle is ?
17.35674
term in 1 ,2,3,4,5,6,7,8,9,10,11,12,13....
35674
Wednesday, 12 September 2012
tcs
placement drive in pondicherry engg. college!!
11th-12th september,2012
i had to write aptitude as my 10 th percentage was 74.5 % and
not 75 % nevertheless if u do things the right way there is nothing stopping
you from getting placed even when people keep saying its gonna be hard this
year.
i will share my experience with you all.
11th morning the aptitude rounds started.it was online.there were 30 questions
and 80 mins to do them. there were puzzles too as expected this year but also
there were questions which were doable and anyone who has practiced quants can
answer them.i just attempted 15 out of 30 questions.and most of them were right
according to my intuition.dont panic when u come to a question which luks
tough.just skip it.u will surely find questions which u can solve.dont go for
blind guesses am far as possible as there is negative marking too.ur accuracy
should be good.i think that plays an important role for clearing aptitude.
around 300 people attended apti round and the results were announced on 11th
evening. 102 people cleared the apti.
day-2: the interviews began today morning.there were around 24 panels and each
panel had 3 interviewers.separate panels for it and eis.just walk in the room
with confidence.dress well.greet all of them with a smile .shake hands.and take
the seat when u r offered.be clear in what u say and express yourself with
confidence.according to my personal experience,i think they r luking for soft
skills in u more than ur technical skills.but u should be ready with the
technical part too.for me they dint ask much technical questions.just about my
project.2,3 simple questions from my area of interest - computer networks.then
there were normal hr questions.again the key is to be precise and clear.the interview
lasted for 15 mins.some of my friends did have to face quite a few technical
questions.they told me that the key is not to say more than asked for as they
tend to form questions from your answers avoid using technical jargons which
you are not clear with, but if you do know what you are talking about then go
along with it. Be clear in explaining the concepts to them,
today evening around 7.30 results were announced and dey selected aroun 140.
remember confidence and ur communication skills is the key!!
all the best guys!!if u deserve it u will surely get in.
..............................................................................................................
##Kishore Kumar ' shares his Interview
Session :)
Congrats Kishore Kumar !!
So here it goes
MY Interview experience (30th Aug - 2011, at 12.25pm)
MY "2-MINUTE" TCS INTERVIEW EXPERIENCE:
Interview Panel: Two Middle Aged men (I represent as HR-1 & HR-2)
Place: Vice
Chairman Room (2nd hall to reception)
I was a bit nervous, on looking at previous candidates of same panel, for whom
questions were from digital, microprocessor. I was a bit nervous and I lose
hope entirely and came to mentality that "I CANT surely get thru"..
I thought "Anyhow I CAN'T get thru, summa I need to jus show some getthu
in interview"
and I entered in wit blank mind and wit some confidence..
HR-2 peeked at me and I gave him a good smile and wished "Happy noon
sir"
He returned me a smile and wished me back
HR-1 was busy looking my xerox copy of certificates.
Next,
HR-2: Wel Kishore right ? Have ur seat man!
ME: (smiling) thank u sir!!
HR-2 : Wel Kishore, let me hear something abt u!!
Me : Sure sir. I am Kishore, doing final year B.Tech in field of infrmation
technology in Sri mankula vinayagr eng colg.
I had done my schooling in 7th day adventist til from 1st til 12th standard,
and cleared out scoring 87% and joined this colg in merit seat.
regarding my family, My dad Mr.Sudarsan is working in private factory and my
mom Mrs. Latha is an excellent home maker. My bro karthik is working for an
private BPO.
Well .. thats all abt me sir
(Now HR-1 looked up at me and asked)
HR-1: Well u have created an website for ur placements right ?? wel wats
exactly was it ..
ME: (looking at both of them) Of Course Sir! I had created IT GROUPS and
PLACEMENT SITE for my colg. Actually the main objective was to share
information so that the information can reach all..
actually this has been created using webs.
(HR-2 interrupted me and asked)
HR-2: Wel how did u created it actually.. and wats the platform u used and
webserver ??
ME: Sir actually its created using free domain called webs, and the webserver
itself allows to store 5MB of files.. it has many predefined templates and
itself allows editor tools to edit pages easily.
HR-1 : so u havent created it using HTML? U have jus created using templates
that already were there.. isnt so.. wats spl in it ??
ME: wel sir. i created the site in my 5th sem, and i had HTML as a subject only
in 6th sem. by the time i created the site i only knew HTML a bit , but not wel
wel versed .. now i am trying learning it in detail to deploy using html..
(MIND VOICE: epadaiyao samaalichen da saami)
HR-1: wel wats the difference between XML and HTML..
(I Immediately replied)
ME: Sir,. user defined in xml and predefined tags in html.. sir also..
HR-1 interrupted me and asked "Well y tcs?"
ME: Wel sir, TATA itself has an brand name. WE CAN SAY ALMOST IN ALL DOMAINS
TATA has established its level. Sir for example .. consider this tea (I pointed
to a tea cup) .. this can be tetley tea.. a product of TATA..
Consider the TAP (Pointing to the steel tap).. this steel may be made of
TISCOL... a product of TATA.. Like wise TATA has domain in almost all fields
and since I am from an IT backgroud I prefer TATA's Software firm . ie TCS..
HR-2 Smiled ..and asked wel that cud also be an AVT tea and Steel cud also be
some othr brand na ??
ME: smiling a bit well.. of course yes sir .. i cud be also.. but thers a
probability that this cud be TATA's make..
HR-1 and HR-2 smiled & exchanged faces for a BIT of second!!
(IT WAS AN REMARKABLE SMILE OF MY LIFE)
HR-1: wel fine Kishore !! is there anything u need to know abt TCS ??
ME : (2 seconds delay) No Sirrr!
HR-2: R u sure ??
ME: YES sir .. boldly and a bit aloud!
HR-2 : Ok u can leave..
ME: ok sir.
I went til door and at that time i remembered to wish them .. i turned back a
bit while holding the door latch pulling it and said..
(to both of them)
have a nice day sir .. Thank u..
have a nice day sir .. Thank u..
thank u..
they too nodded back..
I returned..
On returning i was fully loaded wit heavy pain in heart, (Thinking AYYO POCHE!!
)
After that Meiappane sir comforted me and said a few good words..
slept in class til 4.45 pm after lunch and waited for result.
(I still had a prayer to my soul to get me a chance get thru)
Till 7.30pm, i was fully loaded wit many memories and events that happened in
all my 3.5 years of colg life..
Atlast came result from Cailasaame sir, names of all sorrouding me wre read ..
altlast wit my name in 29th order in 38..
GOsh my life came back!!!!!
Thanked GOD! and ringed my dad to inform !!
Thank GOD!
...........................................................................................................
All the BEST
GUYS DO PREPARE WELL !
Tuesday, 11 September 2012
DISCLAIMER: Please note that this Mock test is
intended to be supplementary and cannot substitute thorough preparation.
Questions in this picture are a collective resources which are
available over the Internet.However, test patterns and questions are likely to change
anytime without notice.
Monday, 10 September 2012
1.What
are the differences between voltage and current controlled devices?
Ans-In
any (electronic) device controlling parameter is current it is called current
controlled device. eg bilpolar transistor- output current is a function of base
current.
In
any (electronic) device controlling parameter is voltage it is called voltage
controlled device. eg Field effect transistor- output current is a function of
gate voltage.
It
depends on the inherent physical mechanism which defines the primary
(independent) controlling parameter.
2-
What is the difference between Power Amplifier and Voltage Amplifier?
Ans-Power
amplifiers basically amplify both current and voltage (p=v*i). Voltage
amplifiers only amplify the voltage.
In
power amplifier feedback employed is current feedback and In voltage amplifier
voltage feedback is employed.
3-
why the bjt is known as current controlled device and fet is known as voltage
controlled device ?
Ans-
1. In BJT because of the current the output will vary.
2.
Where as in FET by means of Voltage the output is varied.
4-What
is the difference between DCS & PLC & SCADA ?
Ans-PLC
stands for Programmable Logic ControllerDCS for Data control SystemSCADA for
Supervisory Control And Data Acquisition SCADA involves supervision by a user
in most cases the plant controller.Whereas PLC is the means by which he
performs the function of SCADA.DCS on the other hand stand only to control the
system and not to log any datain the process of controlling.DCS controllers are
faster than PLCs In DCS controller we can adjust the scan time DCS are costly
more inputs and outputs are there for DCS and SCADA does not have a dedicated
controller. In a DCS system there is SCADA ystem already in it but
for PLC sydtem addition all SCADA software must be provided.
5-What
is the difference between Silicon Controlled Switch (SCS) and Gate Turn-off
Switch (GTO)?
Ans-scs
is nothing but it is the silicon controlled switch as an SCR but gate turn off
is that in which one of the turnoff method of SCR
6-What
is the difference between emulator and simulator?
Ans-Simulator:
A software program impersonating a Hardware. Thus SIMULATING the scenarios
faced in the original hardware.
Emulator:
A Hardware (with or without software) impersonating another Hardware. Thus
ELIMINATING the need for the original.
7-
What is the difference between Circuit Switching and Packet Switching?Ans-Circuit
switching is the transmission technology that has been used since the first
communication networks in the nineteenth century. In circuit switching, a
caller must first establish a connection to a callee before
any communication is possible. During the connection establishment,
resources are allocated between the caller and the
callee.
packet
switching is a more recent technology than circuit switching which addresses a
disadvantage of circuit switching: the need to allocate resources for a circuit,
thus incurring link capacity wastes when no data flows on a circuit. Packet
switching introduces the idea of cutting data on a flow into packets which are
transmitted over a network without any resource
being allocated.
8-
the number of columns in a state table for a sequential circuit with
m flip-flops and n inputs is.
Ans-Its
2m+2n because.. If there are m flip-flops there should be 2m nodes.
If there are n inputs then each node will have 2n.
Q-Design
a digital circuit which has one input two output and one select line input
should be 1000khz output should be 500khz and 250Khz
select
line either 0 or 1
if
0 select 250khz
if
1 select 500khz
Ans-demux
is the circuit which satisfies the given requirement if 0 is given to the
selectline 250khz o/p is provided else 500khz o/p is provided.
9-
What are digital elctronic flip flops, State the different types of flip flop
and their uses.
Ans-Digital
electronic flip flops are temporary single bit storage devices. Different types
of flip flops are JK f/f RS f/f T F/F D f/f this flip flops are using as
storage device delay purpose as counter for toggled as shift register etc
10-
What is the difference between latches and flip flop ?
Ans-Latche
is a bistable circuit which responds to change of logic level as they occur. It
has no external inputs.
Flip
flop is a basic element of memory. It stores a single bit. It has a multiple
input.
Latches
are level sensitive devices where as Flipflops are edge sensitive device
so it is said that latches are level triggered and flip flop is edge triggered.
11-What
is the Tri State of a Signal?
Ans-In
digital ciruit the gate output can be only high or low. In highstate the output
source current at a minimum voltage greater than ~2.8V if load(fan out ) is
proper. In low state it will sink current at max output voltage less than
~0.8V.
Some
times it is desirable to have a state output both not high or low. with neither
sinking or sourcing (with high output impedance). This is called tristate.
Tristate output cannot change output condition of succeding logic gates unless
tristate is disabled.
12-
what is the main difference between 8085 and 8086 processors?
Ans-8085
is a 8 bit microprocessor,having 16-bit address bus.8086 is a 16-bit
microprocessor having 20-bit address bus.
Q-
What is a sequential circuit and What is a combinational circuit? Is there any
difference between them? If yes what is it?
Ans-Combinational
circuit are those whose output depends only upon the present inputs but in
sequential circuit the output depends upon both present and past inputs. that
is the difference
Combinational
circuit does not have any memory in the feedback path but the sequential
circuit has memory in the feedback path.
Ex
of SEQ Circuit: Encoder Decoder etc
Ex
of Comb Circuit; Flipflop
13. What
is the difference between masking and non-masking?
Ans-In
8085 processor TRAP is a non maskable interrupt.
Whereas
RST 7.5 6.5 5.5 intr are maskable interrupts.
Maskable
means this interrupts can be left without considering during the execution of
the program.
Non
maskable depicts that it has to be taken into account during the execution of
the program
14. What
is difference between Fixed-Bias Circuit & Self-Bias Circuit?
Ans-Fixed
bias circuits get their bias voltages from independently designed reference
voltage sources (or even something as simple as a voltage divider). Often is
the case that the bias may be left for the end-user to give some control over
the operation point of the circuit.
Self
biased circuits get their bias voltages from the circuit itself often in the
form of a negative feedback. This is very useful when a circuit is extremely
sensitive to bias points and it becomes impractical to provide external biases
that are correct to very high accuracies. This can happen in high gain
amplifiers with very high impedance output nodes such as a common source
amplifier with an active load. The operation of the circuit dependson the bias
of the active load. It would therefore be desirable to sacrifice some of this
gain by providing a negative feedback from the output to the gate of the active
load. This way you wont have to bias the circuit yourself but will lose some of
the gain of the circuit as a price.
15. What
is meant by filter? What are the different types of filters?
Ans-Filters
are the components of a circuit which remove distortion or ripples.Types of
filters :
1.
High pass filters
2.
Low pass filters
3.
Band pass filters
16. what
is meant by virtual ground in the op amp ?
Ans-Ideally
the output of op-amp should be zero. So for this to happen the 2 inputs must be
same. Hence one of the input is considered to be low or at ground potential.
But this input is not actually ground hence it is called as virtual ground.
17. What
is meant by saying at what current is transistor biased?
Ans-Bias
current of a transistor is the preset DC current when no input voltage signal
is applied to it.
18. What
is Race Around Condition in a JK FlipFlop?
Ans-IN
J-K FF , The clock time is higher than the output toggling time then for J=1
& K=1 , the output will be changed irrelavent of our input. This condition
is known as "RACE AROUND CONDITION"..
19. How
to Convert Binary to Excess 3 Code and vice versa?
Ans-A
number i binary can be converted to excess-3 just by adding the binary
equivalent of 3 to the binary number.similarly a number in excess-3 can be
converted to binary just by subtracting the binary equivaent of 3 from the
binary number.
20. How
to convert Binary to Gray Code
Ans-Take
XOR of binary no. starting from right with the next bit. Add 0 as leftmost bit
to get answer eg. Â 111=7
gray
code 0 xor 1,1 xor 1, 1 xor 1 i.e. 100 ans.
21. What
is the meaning of Tristate Signal in Electronics?
Ans-Tristate
device is 3 terminal device & it has three states. They are logic 0 logic 1
& high impedance state or tristate. This device can be used as switch. For
ON logic 0 or logic 1 (depending on active low or active high appl) OFF as high
independence state.
22. When
a sample of germanium and silicon having same impurity density are kept at room
temperature then Resistivity of silicon will be higher than that of germanium,
Why?
Ans-The
answer is simple. Consider the PN diode for Ge 0.3eV is the breakdown voltage
and in the case of Si its 0.7eV since the impurities are added in the same
amount the bond due to the other atoms of the Si makes it resistive compared to
the Ge.. thats all!
23. Why
gold is added to the p-n junction?
Ans-To
reflect heat. To reduce the recombination time.
24.
Why are the 2 input terminals of an op-amp are called as inverting &
non-inverting terminals?
Ans-Because
if we give input to one input means that will produce the same phase output
where as the other(Inverting) pin produce 180 degree phase shifted output.
25. What
is the equivalent of negative logic AND gate?
Ans-Negative
logic of AND gate is NAND.
26. What
are the main advantages of synchronous circuit?
Ans-All
the inputs are feed at the rising or falling end of the clock signal. This
makes the circuit to perform task in sync. so that the functional integrity of
the logic device is as expected.
27.
How does a Signal differ from a Wave
Ans-Signal
means information. Wave is something that carries the information from source
to destination.
28. Why
do we use two ground pins in the pin diagram of 8086?
Ans-There
are basically two reasons for doing so one is to remove GROUND BOUNCE one more
reason is circuit complexity demands a large amount of current flowing through
the circuits and multiple grounds help in dissipating the accumulated heat so
that device will be safe.
29. What
is the difference between Power Amplifier and Voltage Amplifier?
Ans-Power
amplifiers basically amplify both current and voltage (p=v*i).
Voltage
amplifiers only amplify the voltage.
30.
How to manufacture the CMOS inverter?
Ans-It
can be made by using pmos and cmos in series. Both gate are connected together
and act as input. Source of pmos is connected to supply. drain of pmos is
connected to drain of nmosand it serves as output. source of nmos is grounded.
31. What
are the advantages of using C band for satellite communication?
Ans-Its
frequency ranges from 12 to 18MHz
32. What
is a BCD? What are its advantages and disadvantages? Why is an excess-3 code is
called an unweighted code?
Ans-BCD
means Binary coded decimal its advantage is it can represent decimal numbers in
the form of binary value says (0000-0 to 1001-9).
Binary
codes are divided into weighted binary code and non weighted binary
code Excess 3 code is an example of non weighted codes since the
position of each bits in excess 3 code does not have weights says like ones
tens hundred in decimal and 2^0 2^1 2^2 in binary.
33. What
is power electronics?
Ans-
Power electronics is the technology associated with high power which is more
than 430v 3 phase supply.Generally it is consider in industries for
the efficient conversion control and conditioning of electric power by static
means from its available input form into the desired electrical output form.
34. What
are the differences between microprocessor and micro controller.
Ans-The
microprocessor is the integration of a number of useful functions into a single
IC package.
These
functions are: The ability to execute a stored set of instructions to carry out
user defined tasks. The ability to be able to access external memory chips to
both read and write data from and to the memory.
Basically
a microcontroller is a device which integrates a number of the components of a
microprocessor system onto a single microchip.
So
a microcontroller combines onto the same microchip : The CPU core Memory (both
ROM and RAM) Some parallel digital I/O Essentially a microcontroller is
obtained by integrating the key components of microprocessor RAM ROM and
Digital I/O onto the same chip die. Modern microcontrollers also contain a wealth
of other modules such as Serial I/O Timers and Analogue to Digital Converters.
35. What
is function of ALE in 8085 microprocessor?
Ans-AlE
stands for the address latch enableit 's working is that it differentiate the
address and data bus in microprocessor.when it is high it select address bus
.when it is low it select data bus.
36. Why
we are using the bridge rectifier in most of the circuits instead of full wave
rectifier eventhough the output of both are same?
Ans-In
bridge type (FWR) rectifiers center tapping transformer are not required so
small transformers are used and we will get twice of the out put voltage that
of the center tapped FWR.
37. What
type of architecture is used in 8085 microprocessor?
Ans-
INTEL 8085 is a 8-bit microprocessor.
It's
based on Von-Neumann architecture in which the data and instructions are in the
same memory space without any distinction between them.
Data
line: 8-bits--Can process 8-bits of data at a time.
Address
line: 16-bits--Can address upto 2^16(64KB) of address space.
38. What
is Edison Effect?
Ans-Edison
Effect is also refferred as "Thermionic emission". Here the charge
carriers flow from a charge-carrying surface due to vibrations caused by
thermal energy.
This
phenomenon can be seen in the house-hold electrical bulb in which is a metal
filament is heated by the thermal energy from electricity.
39. how
to design a software IC using VHDL ?
Ans-you
can use software like altera write the required programme download to the chip
here is your software ic
40. What
are semiconductor devices ?
Ans-Semiconductor
Devices is nothing but a device which conduct semi /partially conducting (
semiconductor which conduction property lies between conductor and insulator)is
termed as semiconductor device.
41. Why
the input resistance of an ideal OP-AMP is infinite and output resistance is
zero?
secondly,
how can we measure these resistances(input and output) in case of an ideal
OP-AMPand Real OP-AMP in the following conditions when
1-
load is not connected.
2-
load is connected.
Ans-
Ideal OP-AMP is a power ful concept.
If
one goes through the history of amplifying devices it becomes clear that less
it loads the previous stage better the output signal. ie. it is a trend toward
higher and higher input impedances.
Also
it is better to maintain the signal level irrespective of the LOAD connected at
the ouput. Lesser the output impedance less the signal amplitude reduction when
load is connected. ie. it is a trend toward lower and lower output impedances.
As
ideal opamp is a concept by virtue it has zero output impedance and infinite
input impedance and they are not physically measurable but has to be taken for
granted for the use in theoritical analysis.
To
measure input resistance of non ideal opamp connect a known source at the input
and give a signal (within Specifications) through a current meter of sufficient
precision. Input voltage by current gives the input impedance.
To
measure input resistance of non ideal opamp connect a known source at the input
and give a signal (within Specifications) through a current meter of sufficient
precision. Input voltage by current gives the input impedance.
To
measure output resistance of non ideal opamp connect a known source at the
input such that the output does not saturate and connect a load (within
Specifications ) through a current meter of sufficient precision and meaure the
output voltage. Output voltage by current gives the output impedance.
Please
refer application notes by device manufacturers freely available in internet
for more precise and practical solutions.
42. What
is Pulse Width Modulation?
Ans-Pulse
width modulation is a modulation technique in which the width of the pulse is
varied in accordance with the message signal. Pulse width Modulation is
abbreviated as PWM.
PWM
can be used to reduce the total amount of power delivered to a load without
losses normally incurred when a power source is limited by resistive means.
This is because the average power delivered is proportional to the modulation
duty cycle. With a sufficiently high modulation rate, passive electronic
filters can be used to smooth the pulse train and recover an average analog
waveform.
PWM
is used in sound synthesis circuits.
43. How
many type of resistor are there in diode?
Ans-They
are two types one is forward resistance
1.Forward
resistance
2.Reverse
resistance
1.Forward
resistance-This is the resistance offered in forward bias condition of the
diode. It is calculated by with the help of graph for voltage and current
characteristic.
2.Reverse
resistance-This resistance is offered in the reverse bias condition of the
diode. It is also calculated by the same method.
44. Why
the shape of OP-AMP is triangular not other shape?
Ans-The
Triangular shape symbolizes that it works for continous signals and hence forth
it is an analog device. ex: Opamp
If
it is square then it is digital device. ex: Multiplexer
If
the shape is both triangular and square then it is mixed signal device. ex: ADC
DAC
45
What is Interfacing?
Ans-The
peripheral (simple input/output devices ) connected with computer to perform
tasks is known as interfacing.
46
How microprocessor works without internal memory?
Ans-microprocessor
works without internal memory because it consists of adreess data and control
buses with some registers to process the task given to processor through the
external memory.
47.
What is a sequential circuit and What is a combinational circuit?Is there any
difference between them? If yes what is it?
Ans-Combinational
circuit are those whose output depends only upon the present inputs but in
sequential circuit the output depends upon both present and past inputs. that
is the difference.
48.
What are digital elctronic flip flops, State the different types of flip flop
and their uses.
Ans-digital
electronic flip flops are temporary single bit storage devices.different types
of flip flops are JK f/f RS f/f T F/F D f/f this flip flops are using as
storage device delay purpose as counter for toggled as shift register etc
49. What
CMOS Transistor?
Ans-CMOS-->>Complementary
Metal Oxide Semiconductor
Complementary
metal–oxide–semiconductor (CMOS) is a major class of integrated circuits. CMOS
technology is used in chips such as microprocessors microcontrollers static RAM
and other digital logic circuits. CMOS technology is also used for a wide
variety of analog circuits such as image sensors data converters and highly
integrated transceivers for many types of communication.
CMOS
is also sometimes explained as complementary-symmetry
metal–oxide–semiconductor. The words "complementary-symmetry" refer
to the fact that the typical digital design style with CMOS uses complementary
and symmetrical pairs of p-type and n-type MOSFETs for logic functions.
Two
important characteristics of CMOS devices are high noise immunity and low
static power supply drain. Significant power is only drawn when its transistors
are switching between on and off states; consequently CMOS devices do not
produce as much heat as other forms of logic such as TTL (transistor-transistor
logic). CMOS also allows a high density of logic functions on a chip.
The
triple compound "metal–oxide–semiconductor" is a reference to the
nature of the physical structure of early (and interestingly now the very
latest) field-effect transistors having a metal gate electrode placed on top of
an oxide insulator which in turn is on top of a semiconductor material. Instead
of metal current gate electrodes (including those up to the 65 nanometer
technology node) are almost always made from a different material polysilicon
but the terms MOS and CMOS nevertheless continue to be used for the modern
descendants of the original process. (See also MOSFET.) Metal gates have made a
comeback with the advent of high-k dielectric materials in the CMOS transistor
as announced by IBM and Intel for the 45 nanometer node and beyond
50
. What is Virtual Grounding?
Ans-Virtual
grounding is the shorting of the inverting and the non-inverting terminals of
the op-amp.
The
i/p resistance of opamp is v high. thus the base currents are v less approx 0.
thus no current flows thru i/p resistance. thus we can say that both the NI and
INV terminals of opamp are virtually shorted. i.e the voltage across both
terminals is same. thus if NOW one terminal is grounded due to virtual short
other terminal also will be grounded.
51. Why
the input impedance of OP-Amp is so high?
Ans-In
OPAMP we have 4 stages 1st stage i.e the input stage is a dual i/p balanced o/p
opamp whose i/p resistance is v high. and if we use FET in case of BJT for 1st
stage diffamp then i/p resistance will be v high in M ohms.
52. what
is meant by virtual ground in the op amp ?
Ans-The
op amp connected in a negative feedback configuration that is the o/p connected
to the inverting terminal tried to produce the same voltage at the inverting
node as we applied to the non-inverting terminal no matter whatever be the o/p.
This happens because the opamp has a very high differential gain. so only way
to not to clip or saturate the o/p in either positive or negative side is to
make their both i/ps at the same potential. so when you apply the i/p to the
inverting terminal and you connect the feedback to the inverting node and your
non-inverting terminal is grounded then op amp tries to force the inverting
node at the ground potential and whatever the difference between these two
nodes are amplified.
53. Which
one is faster between NAND-SR FF and NOR-SR FF?
Ans-well
both deals with same principle.but i think NAND-SR FF is faster than NOR-SR FF
54. Cost
of storing a bit is minimum in
1.
Cache 2. Register
3.
RAM 4. Magnetic tape
Ans-Magnetic
Tape
56. How
many characters per sec (7 bits + 1 parity ) can be transmitted over a 2400 bps
line if the transfer is synchronous (1 start and 1 stop bit)?
1.
300 2. 240
3.
250 4. 275
Ans-
2400/(7+1+2) 240
57. What
does CE mean..U will see it on almost every chip(IC)..
Ans-The
CE mark is a mandatory European marking for certain product groups to indicate
conformity with the essential health and safety requirements set out in
European Directives. The letters 'CE' are an abbreviation of Conformité Européenne,
French
for European conformity. The CE mark must be affixed to a product if it falls
under the scope of the approx. 20 so called 'New Approach' Directives. Without
the CE marking, and thus without complying with the provisions of the
Directives, the product may not be placed in the market or put into service in
the fifteen member states of the European Union and Norway, Iceland and
Liechtenstein. However, if the product meets the provisions of the applicable
European Directives, and the CE mark is affixed to a product, these countries may
not prohibit, restrict or impede the placing in the market or putting into
service of the product.
Thus,
CE marking can be regarded as the products trade passport for Europe. The CE
mark is not a quality-mark. First, it refers to the safety rather than to the
quality of a product. Second, most quality markings are voluntary opposite to
the CE marking, which is mandatory for the products it applies to. CE indicates
conformity with mandatory European safety requirements. European conformity is
certified by following clear and understandable procedures, the so-called
‘conformity assessment procedures’
58. What
is the difference between PLC and DCS?
Ans-PLC
means Programmable Logic Controller, which can be used to control one
particluar control system such as a boiler or a injection system.
but
DCS is Distributed control syetem, which is used to monitor and control the
total process plant. in DCS we have no of controllers connected to a single
monitoring system.
59. why
the feeding frequency to a microprocessor s twice the operating
frequency.
Ans-since
8085 microprocessor operating frequency 5 mega hz but operating frequency is 10
mega hz because crystal effect in processor
60. Do
we have any negative frequency?
Ans-no
it can't be negative because freguency is simply the reciprocal of time and
time can't be negative.
We
use negative frequencies in our calculations just for easieness but remember at
last we neglect it also
61. what
is angle and amplitude modulation? what is noise in modulation?
Ans-
modulation means change. to send a message of low frequency to a far distance
we use a carrier of high frequency to carry the message. while transfering we
change some parameters of carriers for faithful tranformation of message
signal. if the amplitude of the carrier is varied in accordance with frequency
of message signal then it is called amplitude modulation. if either phase or
frequency is changed in accordance with the frequency of message signal then it
is called angle modulation.
noise
is an unwanted signal which enter in signal while transfering a signal and
makes the signal distorted.
62. what
is selective flooding?
Ans-
Selective Flooding is a method to compute the Qos of the system
63. what
is fixed bias with and without decoupling capacitor
Ans-
with ta decoupling capacitor u cannt get o/p bcz it blocks the DC and allows
only AC ok.... is u dont us it it give the o/p but it's DC only so no use to
hav a DC voltage in O/P
64. what
is the main application of scr in electronic field as well as in software
field?
Ans-
SCR is a rectifier we use this in power handling applications .
By
varying on time and off time of the scr i.e by giving the pulse to its gate we
can vary the average output power from the main power supply to the required
device .
software
part
we
can use microcontroller and write a programme so that to generate required
pulses to control the SCR.
65. What
is Biasing?
Ans-
Biasing is process of applying potential across any electronic equipment in
order to make it operate as we require.
Some more questions
1.
How do you make a memory card of mobile phone?
A
memory chip stores bits and mounted in a card with electrical contacts so a
computer or camera can send data to be stored. There is not much more to it
than that.
2.
Why do I not see the battery and capacitor combination for power backup?
There
are "super capacitors" that are used for power backup - they are
efficient for short-term power take-over, but they are leaky and are not good
for long term. Batteries tend to die slowly, more slowly than the leakage on a
power backup capacitor, so the capacitor does not do any good. Regular
capacitors store so little energy they cannot really be a power source.
3.
When recording infrasound waves or microwaves how do they differ from one
another? What is the best way to read them?
By
microwaves, do you mean radio signals, like in a microwave oven? These have
nothing to do with sound. There is no way to "record" microwaves
really.
Sure,
you can build a microwave transmitter with lots of power, enough to cook
everyone in a building if you wanted to. The military has a microwave gun that
heats up your skin painfully at a good distance (of course, all you do is wear
aluminum foil and it does not affect you at all).
4.
How can we prove that radio waves are sine waves? What makes them sine?
Fourier
says that only a sine wave has no harmonic content. The math works out that if
you have any wave shape other than a sign wave, you can break it down into a
group of sine waves of different harmonic frequency, phase, and amplitude. All
those harmonics go to zero when the wave shape is a pure sine. We can tell that
radio waves behave like a sine, you can run them through a narrowband filter,
and no energy is lost. Maxwell's equations predict propagation and fields based
on a sine wave, and anything other than that propagates as if it is multiple
frequencies, which do not propagate energy as well. So mathematically, radio
waves work as they measure to work only if you assume they are sine waves.
5.
Is it possible to reverse the order of a Variable Frequency Drive? Ex: I want
to be able to create 120v power from a variable speed engine, with at least 6kw
of power.
You
say many alternators, but really, you need only one. The more I think about
this, the more I think it is not so hard to do. If you have a 6KW alternator,
it's possible that it has some kind of voltage regulation, maybe the rotor is
not a permanent magnet, but an electromagnet with ring brushes, and there's a
regulator circuit that drives this to keep the voltage constant regardless of
frequency. If this is the case, what I would do (not many would try this) is
rectify this to make 150 volts DC with a simple rectifier bridge and filter cap
(total maybe $30). Then buy some 1KW inverters, and tap into them after the
DC-DC converter (the part where it takes in 12VDC and steps it up to 150 VDC),
drive the 150VDC in at that point, then let it switch this to AC for you. You
could put 6 of these all running from the same alternator, so you could run 6
1KW loads.
Now
taking this idea a step further, I would realize that the DC-DC converter is
most of what you are paying for in the inverter, and it is the source of
inefficiency in the inverter. So you are wasting a lot of money and watts, and
so I would copy the circuit out of it that does the switching (4 power FETs and
a 60 cycle driver) and have my inverter done much cheaper.
6.
Why does charging batteries take lengthy periods? What can be done to quicken
the speed?
Batteries
work through a chemical process, some kind of ion exchange where the battery
contains two elements that want to combine ions and give up an electron to
cause current flow. They do this energy release all by themselves with no
energy added, it wants this exchange to happen it is more stable after the
reaction. Therefore, to charge the battery you are forcing things to go
backwards, which the reaction does not like. By adding a current, you are
making the reaction reverse. This is not an efficient process, and usually
takes more energy than is given back, like more than twice as much takes
(depends on the battery type). Where does the extra energy go? It is into heat
mostly.
Therefore,
the problem with fast charging is you cannot put so much energy back that you
get the battery too hot and melt it down. You can charge a battery at a much
higher rate than you discharge it, so you can make the charge cycle take less
time than the discharge (this depends on the discharge rate as well, of
course). However, you are limited by the heat, so a 1-minute charge of your
electric car just is not possible.
7.
What do mean by "flow of electron"?
Flow
of electrons is just what it says - electrons flow down a wire that is what
current, is. Good conductors like copper and silver and aluminum have free
electrons in their outer shells, and they jump from atom to atom down a wire.
It is somewhat similar to water flowing down a pipe.
It's
kind of amazing that you can force this to happen with a battery or a magnet,
and that you can transfer energy this way, but that's what it does.
8.
What are encoder and the decoder? What are the uses of these two devices? Also,
write about how it works with circuit diagram.
There
are zillions of things in electronics called encoders. You can look up LCDs and
NAND gates as well and this is really basics.
9.
Do you have any ideas how to make a ping-pong ball launcher that reloads
automatic and shoots automatically?
Air
cannon is probably the simplest, PVC pipe from Home Depot and shoots things
very far, can make any size you want, need a tire pump or air compressor to
power it. It is also called Potato Cannons for obvious reasons. I shot a potato
over 1000 feet with 60 psi and 2" pipe.
10.
Is it possible to build an AC or DC variable-speed generator with a variable
field current, controlled by a signal from a torque sensor connected to the
shaft of the generator (i.e., net torque = 0)?
You
can control the field with anything, but why would you do it with torque? Why
do you say net torque=0? What is the significance of variable speed?
I
am trying to think of why you would do this. If the torque were low, you could
increase the field to generate more energy, which would make the torque go up.
That is positive feedback, but maybe it is constant power into a resistive load
(voltage would go up). If you did negative feedback, that would mean the field
would reduce as the torque went up, reducing the torque, so you would have a
torque regulator. This would probably be good for a wind generator, as you want
to control the torque to match the wind speed to get maximum energy out, but
this would also vary the output of the generator a lot. Maybe if you were
heating water this would work.
11.
What is the significance of "4-20 mA" signal in hart protocol?
The
HART protocol is an old Frequency Shift Keying way of sending data, typically
from highway sensors. This is a very old standard by today's standards there
are so much better ways to send data. Of course, 4-20 ma loops are even older,
dating back over 50 years, and still in common use. Must be something good
about it - it is simple.
4-20
ma loops are a way to send an analog value, like temperature or position, over
a pair of wires. It is simple on the surface, 4 mA is the minimum, and 20 mA is
the maximum of the range. The cool thing about this is that it is constant
current, not a voltage, so line resistance does not matter. Anything, constant
current looks like an open circuit, so it is supposedly immune to noise (though
in reality it still has noise pickup problems). However, why not 0 to 20 mA the
cool thing is you can power the remote sensor. You are running a current
through the remote you have a voltage at the driving end why not use some of
that power to run the electronics in the sensor? Therefore, if the sensor pulls
less than 4 ma and you make the range 4-20, you always have enough current to
power the remote at the same time.
12.
The current through a resistor of 50 Ω in an AC circuit at t = 0.008 s is 65%
of the peak value. The smallest possible frequency of the generator delivering
the current is
If it is then this is easy, you take the arcsine of 65% that
gives you what angle you are at in the sine cycle, take the ratio of that to
360, and multiply that by 8mS to get the time of a full cycle, and then take
one over that to get frequency. This will be the lowest frequency. Note that
the 50 ohms has nothing to do with it, other than implying it is an RF circuit
where 50 ohms is common. You say "smallest possible frequency" which
also is not very clear I will assume you mean lowest frequency. There is no
highest frequency you can meet this requirement with an arbitrarily high
frequency.
13.
What is the difference between Photodiode and Solar cell?
A
photodiode is made to detect light quickly a solar cell is made to collect
energy from light. They are both typically silicon diodes, but modified to meet
their different requirements. A photodiode has to be fast, which means low
capacitance, which means small area of silicon. Therefore, it is not very
sensitive, and cannot generate much power from light. A solar cell has as large
an area as you can afford to buy, getting watts per square inch. There are
other differences in the way they are made, and how the PN junction is grown,
but they all relate to this difference in purpose.
14.
Can you explain electricity at atom level and if possible show some diagrams
please
If
you look at the classic Bohr model of the atom (from 1913), you have electrons
orbiting around a nucleus of protons and neutrons. Normally there are as many
electrons (negative charge) as protons (positive charge), so the net charge of
the atom is zero. The various shells or orbit radii of the model have different
characteristics as to how many electrons they are happy having orbiting in
them. The first shell likes 2 max, the 2, and 6, etc. If there is one less
electron that what the outermost used shell considers full, it will happily
take on another electron, even if this unbalances the charge. If it has just
one electron in a shell, it would happily give it up even if it unbalances the
charge. Copper, one of the best conductors of electricity, has 29 electrons,
which means in its 4th orbit, it has one electron. It is easily taken away by
something pulling on it. In fact, if you put a bunch of copper atoms together,
there is a cloud of electron sharing with that one electron moving from atom to
atom, and others taking its place.
Electricity
is current flow, and current flow is the movement of electrons. In a copper
wire, if you push the electrons with some electro-motive force, they will flow
and make a current. A battery has chemicals in it that push electrons with a
chemical reaction. A generator pushes electrons with a magnetic field. A solar
cell pushes electrons when photons hit a certain material and knock electrons
off. If you push electrons through something that does not want to give up its
electrons, it will resist and give off heat or light when electron flow is
forced upon it. This all gets very complicated in the details, but it explains
heaters, LEDs, and incandescent lights, etc. A moving electron flow creates a
magnetic field, which explains motors and electromagnets. Energy is therefore
passed by moving electrons through a wire, a very convenient effect for the
world.
15.
How can the electromagnetic can travel in air and not lose any information
contained in them?
There
is a limit to how far you can get television signals. The power is spreading
out the farther you are away from the source. At some distance, you reach a
point where the noise in the atmosphere becomes greater than the signal, and
you can no longer extract all the information from the signal. Digital
television has much error correction, many bits are sent just so corrections can
be made when there are errors. This helps on the fringe, but even this fails
when the signal gets weak enough. However, error correction makes the signal
perfect until you hit that exact point where the correction fails. Thus,
digital TV has a sharp cutoff point - you get a perfect picture, or it goes
away completely. Therefore, electromagnetic waves do lose information. Think of
someone aiming a flashlight at you. The person walks further and further away
from you. At some point, you are just not going to be able to tell. What if
there were fogs or lots of pollution in the air? Alternatively, 20 other
flashlights and you had to pick out just the one. It is easy and 100% when they
are close.
16.
How is the transmission of a signal in a computer over x number of clock cycles
translated into binary?
All
computer logic today uses FETs as switches. A FET is a switch with gain,
meaning that a small signal change on its input (the Gate) causes a bigger
signal in the Drain. Bigger does not mean bigger voltage, it usually means more
current at the same voltage, so it can drive many other inputs after it. Two
FETs can be connected together to make a logic gate, like an AND function. In
addition, gates can be connected together to make flip-flops and counters and adders,
etc.
Logic
"1" is usually a higher voltage than logic "0", and logic 0
is usually zero volts. In newer processors, the high voltage is less than a
volt, since the FETs are so small that 1.5V will blow them up.
Therefore,
it is not the presence of a signal or the lack of one; it is a high voltage and
a low voltage. There is nothing that the computer translates, that voltage is
it, throughout the computer. That is what binary means, one of two voltages.
There is no clock involved to make something binary all signals in the computer
are all binary logic with a voltage. Even a clock is just a logic signal that
goes between 1 and 0 at a periodic rate.
17.
Can we calculate the resistor if it is installed in circuit board?
You
can measure a resistor in a circuit but the circuit will most likely affect the
value read (usually making it look lower in resistance). A simple example would
be if there were two resistors in parallel in the circuit. If you measure one,
you will get the resistance of the two in parallel, and maybe other effects of
the rest of the circuit.
Most
resistors have markings on them, and they rarely fail unless they are cooked by
too much power. That is the easy way. If they are not marked, you want to know
the value, and it is in a circuit, then it is hard to figure out the value. It
might be easier to unsolder one end of it and then measure it.
Digital
electronics
1.
Flip flop and their working. What is
metastable state in flip-flops?
2.
Construct a d flip-flop from a t
flip-flop.Differentiate b/w flip-flop and latches
3.
What is totem pole?
4.
Draw the state graphs for a given
problem like sequence generator, flip flop etc
5.
Implement Boolean expressions using MUX
(2 to 4,3 to 8,etc)
6.
Design a decade counter
7.
Explain internal organization of memory
chips
8.
What is a bit? What is CMOS? Draw the
circuit of an adder using NAND gate
9.
What is a Karnaugh map?
10.
What are the four methods to reduce a
Boolean?
11.
What is the difference b/w half adder
and full adder?
12.
What are the advantages of CMOS and
TTL?What technology is used in CMOS logic?What are VLSI and ULSI? What is the
number of components in both?
13.
Explain synchronous and asynchronous
counter
14.
Minimize the function using Quine
McClusky:f=xy+x’y+yz+x’y’z’
15.
What is prime implicant? Which is the
universal flip-flop?
16.
What is SRAM and DRAM? Compare the two,
relative cost of the two.
17.
What will happen in the case of a power
failure for the above?
18.
What is tristate or high impedance
state?
19.
What are the difference between open
collector output and totem pole out put?
20.
Find the highest clocking frequency of a
digital circuit give the rise time ,fall time and propagation delay?
Electronic
Devices & circuits
1.
Obtain a square wave from sine wave from
Zener diodes.
2.
What is the difference between
oscillator and multivibrator?
3.
What is emitter follower? What is an
opamp?
4.
What is the ideal gain of an opamp?
5.
How is amplification possible in a
transistor?
6.
Classify power amplifiers
7.
How does a diode look(internally)?
Explain the working using internal diagram
8.
Explain processes taking place in the
depletion junction of a forward biased diode
9.
What is a buffer? What is the gain of a
buffer?
10.
What is an oscillator?
11.
How do you forward bias a transistor?
12.
What are the practical applications of a
transistor?
13.
What is reverse recovery time and how
does it affect a diode?
14.
Draw and explain the working of a
monostable vibrator using op amp
15.
State Thevenin’s theorem and Norton’s
theorem. What are their applications?
16.
What is the virtual ground in an op amp?
17.
Differentiate between intrinsic and
extrinsic semiconductor
Power
Electronics
1.
What is a thyristor and differentiate
between thyristor and a diode
2.
Switching action of an SCR and
triggering. Draw the diagram of thyristor
3.
Draw an internal block diagram of a
normal voltage stabilizer
4.
What is a reference variable?
Control
Systems
1.
Define control systems. Why are they so
important?
2.
What are the different types of control
systems?
3.
Explain open loop with block diagram
examples
4.
What are the advantages and drawbacks of
closed loop?
5.
How can you design a stable system?
Explain different stability criteria
6.
Explain Ruth-Hurwitz rule in one
sentence. What are poles and their significance?
7.
Is there any control system in this
room(interview hall)?
8.
Draw the block diagram of a control
system and write its transfer function
9.
What is ROC? Explain transformation
between s and z planes
10.
Differentiate between open and closed
loop control systems
11.
What is meant by adaptive control
system?
12.
Find the transfer function of a given
RLC circuit
Communication
1.
What is packet switching and circuit
switching? What is the protocol used in telephone network?
2.
What is modulation? Why is needed? What
are the various types?Compare AM,FM, PM.Which waves will travel a longer
distance- FM or AM and why?
3.
What is the mode of transmission of
television signals?
4.
Compare the bandwidth requirements of AM
and FM
5.
What do you know about antennae?
6.
Why is linking up frequency greater than
the down linking frequency?
Modern
trends and general questions
1.
What is a modem? Draw its internal
diagram
2.
What is VoIP?
3.
What is the most important advantage of
Bluetooth?
4.
What is wave studio? What is Bit rate?
5.
What is the difference between mp3 and
WAV formats?
6.
What is sampling? What is a database?
What is VHDL? What is a complier?
7.
What is FSF? Cite any current relevance
8.
Volume control in TV is logarithmic.
Why?
9.
What is the mathematics used in DSP and
from which domain to which domain is it converted?
10.
Differentiate between macros and
functions in C .Explain the booting process of a computer.What is round robin
technique of interrupt arbitration
