1

--------S ----R1-------

| R2

V |___

| R3 |( C

| | -----

--------------------------

instantaneous Voltage across R2 when switch S is closed :

a.V*R2/(R1+R2)

b.V*R2/(R1+R2+R3)

c.0

d.V

Ans V*R2/(R1+R2+R3)------is what I wrote

2

---------R----------

| |

V L

| |

_______________

as freq increases which of the following increases

ans : Z and V(L)

3 q? on setup time and dealy

diagram below given not very clear\

clock period is 10ns ,

setuptime of each ff is 2 ns

clk2Q delay is 3ns

Slew dew to inverter is 1ns

Wht is the max allowable dealy of block D hold time=0

Ans 10-2-3-1=4ns

D

Slew=1

CLK=10ns

4 o/p of the following gate

A

or

nand

B

nand

C D

and

not

e

ans : (a+b)c+de

5 SER=10^-4 the BER of a QPSK

a =SER

b <=SER

c>=SER

d =SER/2

ans >=SER

6 for 62db of PCM System what is the no of bits =10

7 for a 4 level pipeline processor the no of machine cycles required for
executing 4 and (someno I dont rember) with initially pipeline flushed

ans = 4+3 and +3

u add there for initial latency

8 An ideal LPF is

a causal

b non causal

c non stable

d none

ans: non causal ,

9 impluse func and white noise have same

a magnitude and phase response

b magnitude response

c phase response

d none

ans magnitude and phase response

10

y(t)=y(t-1)+0.1x(n) is what typr of filter

ans : IIR LPF

11 a signal s(t)=sin(omega*t) is sampled at fs, then the resulting signal
spectrum is periodic depends on:

a Omega/fs

b omega *fs

c omega

d fs

ans omega/fs

12 if 2 gaussian func of mean m1 and m2 are added the wht is the resulting PDF

a guassian func with mean m1+m2

b guassian func with mean m1+m2/2

c uniform with mean m1+m2

d rayelig with mean m1+m2

13 u(t)+ sumof( deltafunc(n-k)){n=- infinitive to+ infinitive ) is equaltent to

I hope I am made this clear it is a simple one

Ans u(-t-1) +2u(t)

14 if the probaba of drawing an even no is p the wht is the probailty of drawing
odd no in 2nd chance given 1st draw resulted in even one

a.p

b.(1-p)

c.p(1-p)

d.p/(1-p)

ans p(1-p)

15 no of multi required to mutli 2 upper triangular matrixes

a p(p+1)/2

b (p-1)(p+1)/2

c.summation (i=1 to p) i(i+1)/2

d..

ans:c

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