1. The cyclic codes are designed using

A. Shift registers with feedback
B. Shift registers without feedback
C. Flipflops
D. None of the mentioned

Answer: A

The cyclic codes are a subclass of linear codes. It is designed using feedback shift registers.

2. A cyclic code can be generated using

A. Generator polynomial
B. Generator matrix
C. Generator polynomial & matrix
D. None of the mentioned

Answer: A

A cyclic code can be generated using a generator polynomial and block codes can be generated using a generator matrix.

3. The feedback shift register circuit is called as

A. Multiplying circuit
B. Dividing circuit
C. Feedback circuit
D. Shifting circuit

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Answer: B

The cyclic shift of a code-word polynomial and encoding involves the division of one polynomial by another. Thus this feedback shift register is also called a dividing circuit.

4. In the dividing circuit, the parity polynomial is obtained by the

A. Quotient
B. Remainder
C. Dividend
D. Divisor

Answer: B

The parity polynomial is the remainder after diving by the generator polynomial it is available in the register after n shifts through the n-k stage feedback registers.

5. The received code contains an error if the syndrome vector is

A. Zero
B. Non zero
C. Infinity
D. None of the mentioned

Answer: B

If the syndrome is an all-zero vector then the received code word is a valid code. If the syndrome is a non-non-rotor then the received code has errors.

6. Block codes are generated using

A. Generator polynomial
B. Generator matrix
C. Generator polynomial & matrix
D. None of the mentioned

Answer: B

Block codes are generated using generator matrix and cyclic codes are generated using generator polynomial.

7. Extended go-lay code is formed by

A. Adding overall parity bit to perfect go-lay code
B. Ex-oaring overall parity bit with perfect go-lay code
C. Ex-oaring each bit of go-lay code
D. Dividing the overall parity bit with perfect go-lay code

Answer: A

Extended go-lay code is formed by adding an overall parity bit with the perfect bit known as the Golay code.

8. Block length is the _____________ in the code word.

A. Number of elements
B. Distance between elements
C. Number of parity bits
D. None of the mentioned

Answer: A

The block length n is the number of elements in the code word.

9. The rate of a block code is the ration of

A. Block length to message length
B. Message length to block length
C. Message weight to block length
D. None of the mentioned

Answer: B

The rate of a block code is the ratio between its message length and the block length, R=k/n.

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10. Linear codes are used for

A. Forward error correction
B. Backward error correction
C. Forward error detection
D. Backward error detection

Answer: A

Linear codes are used in forward error correction. It allows for more efficient encoding and decoding procedures.

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