# Shannon Hartley Capacity Theorem

This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Shannon hartley theorem and turbo codes”.

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

a) Rs

b) 2Rs**c) Rs/2**

d) Rs2

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 )

3. Which parameter is called as Shannon limit?

a) PB/N0**b) EB/N0**

c) EBN0

d) None of the mentioned

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 total number of bits

d) None of the mentioned

5. Equivocation is the**a) Conditional entropy**

b) Joint entropy

c) Individual entropy

d) None of the mentioned

6. For a error free channel, conditional probability should be**a) Zero**

b) One

c) Equal to joint probability

d) Equal to individual probability

7. Average effective information is obtained by**a) Subtracting equivocation from entropy**

b) Adding equivocation with entropy

c) Ratio of number of error bits by total number of bits

d) None of the mentioned

8. Turbo codes are**a) Forward error correction codes**

b) Backward error correction codes

c) Error detection codes

d) None of the mentioned

9. Components used for generation of turbo codes are

a) Inter leavers

b) Punching pattern**c) Inter leavers & Punching pattern**

d) None of the mentioned

10. Decoders are connected in series.**a) True**

b) False

11. The inter leaver connected between the two decoders is used to

a) Remove error bursts**b) Scatter error bursts**

c) Add error bursts

d) None of the mentioned

12. In soft decision approach what does -127 mean?

a) Certainly one**b) Certainly zero**

c) Very likely zero

d) Very likely one

13. In soft decision approach 100 means?

a) Certainly one

b) Certainly zero

c) Very likely zero**d) Very likely one**

14. In soft decision approach 0 represents

a) Certainly one

b) Certainly zero

c) Very likely zero**d) Could be either zero or one**

View AnswerAnswer: d