dc

6. Which of the following is correct?
(a) Channel coding is an efficient way of representing the output of a source
(b) ARQschemeoferrorcontrolisappliedafterthereceivermakesadecisionaboutthereceivedbit
(c) ARQ scheme of error control is applied when the receiver is unable to make a decision
about the received bit.
(d) Source coding introduces redundancy
7. Which of the following is correct?
(a) Source encoding reduces the probability of transmission errors
(b) In an (n,k) systematic cyclic code, the sum of two code words is another codeword of the
code.
(c) In a convolutional encoder, the constraint length of the encoder is equal to the tail of the
message sequence+ 1.
(d) Inan(n,k)blockcode,eachcodewordisthecyclicshiftofananothercodewordofthecode.
8. Automatic Repeat Request is a
(a) error correction scheme
(b) Source coding scheme
(c) error control scheme
(d) data conversion scheme
9. The fundamental limit on the average number of bits/source symbol is
(a) Channel capacity
(b) Entropy of the source
(c) Mutual Information
(d) Information content of the message
10. The Memory length of a convolutional encoder is 5. If a 6 bit message sequence is
applied as the input for the encoder ,then for the last message bit to come out of the encoder,
the number of extra zeros to be applied to the encoder is
(a) 6
(b) 4
(c) 3