# Turbo Code MCQ [Free PDF] – Objective Question Answer for Turbo Code Quiz

1. The minimum Nyquist bandwidth needed for baseband transmission of Rs symbols per second is

A. Rs
B. 2Rs
C. Rs/2
D. Rs2

The theoretical minimum Nyquist bandwidth needed for the baseband transmission of Rs symbols per second without ISI is Rs/2.

2. The capacity relationship is given by

A. C = W log2 ( 1+S/N )
B. C = 2W log2 ( 1+S/N )
C. C = W log2 ( 1-S/N )
D. C = W log10 ( 1+S/N )

The capacity relationship from the Shannon-hartley capacity theorem is given by C = W log2 ( 1+S/N ).

3. Which parameter is called as Shannon limit?

A. PB/N0
B. EB/N0
C. EBN0
D. None of the mentioned

There exists a limiting value for EB/N0 below which they can be no error-free communication at any information rate. This EB/N0 is called as Shannon limit.

4. Entropy is the measure of

A. Amount of information at the output
B. Amount of information that can be transmitted
C. Number of error bits from the total number of bits
D. None of the mentioned

Entropy is defined as the average amount of information per source output.

5. Equivocation is the

A. Conditional entropy
B. Joint entropy
C. Individual entropy
D. None of the mentioned

Shannon uses a correction factor called equivocation to account for uncertainty in the received signal. It is defined as the conditional entropy of the message X given Y.

6. For an error-free channel, the conditional probability should be

A. Zero
B. One
C. Equal to the joint probability
D. Equal to individual probability

For an error-free channel, the conditional probability should be zero because having received Y there is complete certainty about the message X.

7. Average effective information is obtained by

A. Subtracting equivocation from entropy
C. Ratio of number of error bits by the total number of bits
D. None of the mentioned

According to Shannon, the average effective information is obtained by subtracting the equivocation from the entropy of the source.

8. Turbo codes are

A. Forward error correction codes
B. Backward error correction codes
C. Error detection codes
D. None of the mentioned

Turbo codes are a class of high-performance forward error correction codes.

9. Components used for the generation of turbo codes are

A. Inter leavers
B. Punching pattern
C. Inter leavers & Punching pattern
D. None of the mentioned

There are many instances of turbo codes, using different component encoders, input/output ratios, inter leavers, and punching patterns.

10. Decoders are connected in series.

A. True
B. False