1. If x and y are independent
Gaussian random variables with average value 0 and with same variance, their
joint probability density function is given by:

(A) p(x,y)=p(x).p(y)

(B) p(x,y)=p(x)+p(y)

(C) p(x,y)=p(x+y)

(D) p(x,y)=p(x).p(y)+p(x)

Answer:

2. In order that a code is ‘t’
error correcting, the minimum Hamming distance should be:

(A) t

(B) 2t-1

(C) 2t

(D) 2t+1

Answer: D

3. The Boolean expression
x’y’z+yz+xz is equivalent to:

(A) x

(B) y

(C) z

(D) x+y+z

Answer: C

4. The characteristic equation
of a JK flip flop is:

(A) Q

_{n+1}=J.Q_{n}+K.Q_{n}
(B) Q

_{n+1}=J.Q’_{n}+K’.Q_{n}
(C) Q

_{n+1}=Q_{n}J.K
(D) Q

_{n+1}=(J+K)Q_{n}
Answer: B

5. In order to implement a n
variable switching function, a MUX must have:

(A) 2

^{n}inputs
(B) 2

^{n}+1 inputs
(C) 2

^{n-1}inputs
(D) 2

^{n}-1 inputs
Answer: A

6. The throughput of pure
ALOHA is given by:

(A) S=G

(B) S=e

^{2G}
(C) S=Ge

^{2G}
(D) Ge

^{-2G}
Answer: D

7. The Fiber Distributed Data
Interface uses:

(A) single mode fibers and LEDs

(B) multimode fibers and LEDs

(C) single mode fibers and ILDs

(D) multimode fibers and ILDs

Answer: B

8. To employ multi-access in
GSM, users are given different:

(A) time slots

(B) bandpass filters

(C) handsets

(D) frequency bands

Answer: B

9. With a four programs in
memory and with 80% average I/O wait, the CPU utilization is?

(A) 60%

(B) 70%

(C) 90%

(D) 100%

Answer: A

10. Assume N segments in memory
and a page size of P bytes. The wastage on account of internal fragmentation
is:

(A) NP/2 bytes

(B) P/2 bytes

(C) N/2 bytes

(D) NP bytes

Answer: A

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