# Linear Block Code - Cyclic & Convolutional Code - MCQs with Answers

## Linear Block Code - Cyclic & Convolutional Code - MCQs with Answers

Q1. For a (7, 4) block code, 7 is the total number of bits and 4 is the number of

a) Information bits
b) Redundant bits
c) Total bits- information bits
d) None of the above

Q2. Interleaving process permits a burst of B bits, with l as consecutive code bits and t errors when

a) B <= 2tl
b) B >= tl
c) B <= tl/2
d) B <= tl

Q3. The code in convolution coding is generated using

a) EX-OR logic
b) AND logic
c) OR logic
d) None of the above

Q4. For decoding in convolution coding, in a code tree,

a) Diverge upward when a bit is 0 and diverge downward when the bit is 1

b) Diverge downward when a bit is 0 and diverge upward when the bit is 1

c) Diverge left when a bit is 0 and diverge right when the bit is 1

d) Diverge right when a bit is 0 and diverge left when the bit is 1

ANSWER: a) Diverge upward when a bit is 0 and diverge downward when the bit is 1

Q5. A linear code

a) Sum of code words is also a code word
b) All- zero code word is a code word
c) Minimum hamming distance between two code words is equal to weight of any non zero code word
d) All of the above

ANSWER: d) All of the above

Q6. Graphical representation of linear block code is known as

a) Pi graph
b) Matrix
c) Tanner graph
d) None of the above