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paper of DC-503 Digital Communication SVITS RAVINDRA

# Course=DC-503Subject=Digital Communication

## Question no-1 (a)                  A

(b)                  B

(c)                  C

(d)                  D

Sollution

(c)                  C

## Question no-2 (a)                  A

(b)                  B

(c)                  C

(d)                  D

Sollution

(a)                  A

## Question no-3 (a)                  1

(b)                  2

(c)                  3

(d)                  3.5

Sollution

(c)                  3

## Question no-4 (a)                  A

(b)                  B

(c)                  C

(d)                  D

Sollution

(b)                  B

## Question no-5 (a)                  A

(b)                  B

(c)                  C

(d)                  D

Sollution

(d)                  D

## Question no-6 (a)                  A

(b)                  B

(c)                  C

(d)                  D

Sollution

(a)                  A

## Question no-7 (a)                  .39 to .41

(b)                  .29 to .31

(c)                  1 to 2

(d)                  4 to 5

Sollution

(a)                  .39 to .41

## Question no-8 (a)                  100

(b)                  200

(c)                  300

(d)                  400

Sollution

(d)                  400

## Question no-9 (a)                  A

(b)                  B

(c)                  C

(d)                  D

Sollution

(d)                  D

## Question no-10 (a)                  30

(b)                  31

(c)                  32

(d)                  33

Sollution

(c)                  32

## Question no-11 (a)                  .39 to .40

(b)                  .29 to .30

(c)                  .19 to .20

(d)                  1 to 2

Sollution

(a)                  .39 to .40

## Question no-12A continuous signal band limited to 5 khz the signal is quantized in 8 levels of a PCM system with the probabilities 0.25 , 0.2 , 0.2 , 0.1 , 0.1 , 0.05 , 0.05 and 0.05 . Entropy of the system

(a)                  1.74 bits/message

(b)                  2.74 bits/message

(c)                  3.74 bits/message

(d)                  4.74 bits/message

Sollution

(b)                  2.74 bits/message

## Question no-13A continuous signal band limited to 5 khz the signal is quantized in 8 levels of a PCM system with the probabilities 0.25 , 0.2 , 0.2 , 0.1 , 0.1 , 0.05 , 0.05 and 0.05 . Rate of information of the system

(a)                  17400 bits/s

(b)                  27400 bits/s

(c)                  400 bits/s

(d)                  7400 bits/s

Sollution

(b)                  27400 bits/s

## Question no-14An event has six possible outcomes with the probabilities p1= .5 , p2 = .25 , p3 = .125 , p4 =.0625 , p5 = .03125 and p6= .03125 . Entropy of the system

(a)                  1.7375 bits/msg

(b)                  1.9375 bits/msg

(c)                  1.1375 bits/msg

(d)                  1.0375 bits/msg

Sollution

(b)                  1.9375 bits/msg

## Question no-15An event has six possible outcomes with the probabilities p1= .5 , p2 = .25 , p3 = .125 , p4 =.0625 , p5 = .03125 and p6= .03125 . Information rate if there are 16 outcomes per second

(a)                  11 bits/sec

(b)                  21 bits/sec

(c)                  31 bits/sec

(d)                  41 bits/sec

Sollution

(c)                  31 bits/sec 