MICROELECTRONICS PLACEMENT PAPER - 2007 (Technical and Aptitude)


a. 9*1 Apti Questions

b. Virtual memory is greater than physical memory

c. Cycle stealing is related to DMA?

d. Conditional operation are stored in flag seg?

e. Some question on stack of heap

f. Charging of MOS transistor

g. Question on current change in mor due to change in Vge.

h. Time constant of RL network

i. One more question on RL network

j. Solve the K-Map

k. Resistance of MOS transistor when the W/L relation is given

l. Which of then is memory related op, Buddying, monitor.


1. Question on counter (divide by 4, 50% DC)

2. 4's Complement of a no.

3. Max operating frequency of a sequential network (166.66 MHz)

4. Some que on microprocessor. Block diagram was given

5. Sampling is done at 210 Hz of a signal containing 50., 100 & 150 Hz signal.
Then the signal is passed there a LPF of 10.5 Mz cut off freq. What is the freq.
component of the output

6. There are poles of OP at 10 KHz Find the value of R1 & R2.

7. Some question on current consolidated current source

8. A signal contain band limited signal B0, 2B0, 3B0.......... NB0. Each of them
is sampled at nygyist rate and quatind to 8 bit.      
Now what is bit rate?

9. Find out noise margins of digital circuit V0,V10, V12, V02, I0n, I.........
were given

10. PCM. The no. of bits is microased from 6 to 8. What is the ratio of SNR and

11. V0/V1= jwt+ 104*2 / jw+ 104 w= 104 V1 = Cor (wt) Now determine V0.

Ans were in the form of Cos (wt + something)Sin (wt + something) ley (wt +

12. Multivibration using 555

13. Some question on transmission line.

Technical and Aptitude:-

1. There is pipe with given radius, a small pipe of given radius. How many pipes
of smaller radius will contain the same quantity of liquid kept by larger radius

2. A ladder is standing against a wall of 25m height at a distance of 7 km from
wall. Suddenly Ladder slips 4m down from top. How much will it move from the
earlier 7m distance from the wall?

3. A person likes 225 not 224, like 900 not 800, from given vat will he
like..1600, 1500.. (Answer is simply ny given square term(1600)..c pattern of
his liking

4. Three co-ordinates of triangle was given.. we had too find type of triangle
it is..

5. A square is cut from a circle and a circle is cut from that square..how much
area is remaining ...

6. In equilateral triangle a circle is drawn. In that circle one square is
drawn. Find the ratio of area of equilateral triangle to square?

7. Question on simple average speed..

8. Question on angle between hands of a clock..

Next questions are technicals

1. Int *p;

P=(int *p)malloc(100);

Wat is sizeof(p),sizeof(*p)

2. A question on find the worst case complexity of Quick Sort (ans :O(n2))

3. Piggy Backing is For ?(Acknowledgement)

4. In POP operation of Microprocessor how it process the instruction

Ans: it pops the instruction and decrements the stack pointer

5. Where does Global, Local and static variables of a program lie?

6. 3 questions on H/w ..that I could not solve...

7. 1 question on Boolean expression(a simple one)

2 marks questions..

1 #define xyz abc*cd

#define abc 10

#define cd 10



Int k;




Ans: -80

2. Static variables don't change their value as they are stored in

a) stack b) data segment c) heap d) none

3. #pragma pack(1)

Struct a


Int a:4;

Int b:45;

Char c;


4. a question on bitwise operator

5.int i=90;

Char *p;

P=(char *)&i ;


Pointer is I ncremented by 2,1,4 or none of these

6.#define scanf "%s is string"




Ans; %s is string is string

7. char str={"neha");

printf("hello \n" %s" \n",str);

output : ?

8. One question on page table. we had to find page size

9. One question on memory acces time of a program with given hit ratio and given
cache access time.. (revise the formula from OS)

10. Find the number of 1's in the following expression

(3*4096 + 16*1024+ 3)

11. 1 question on recursion

int i=89;

Int *p;

Char *t;


T=(char *)&I;

If( *p==*t)




Tell the o/p.

12.What is the size of struct if int is of four bytes.

Ans: 5