Modulation and Entropy

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This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Modulation and Entropy”.

1. PCM includes the process of
a) Amplitude discretization
b) Time discretization
c) Amplitude & Time discretization
d) None of the mentioned

2. For which quantization process is used?
a) Amplitude discretization
b) Time discretization
c) Amplitude & Time discretization
d) None of the mentioned

3. Modulation process corresponds to ______ the amplitude, frequency or phase.
a) Switching
b) Keying
c) Switching or keying
d) None of the mentioned

4. Matched filter
a) Is a non linear filter
b) Produces maximum output SNR
c) All of the mentioned
d) None of the mentioned

5. Which has same probability of error?
a) ASK and FSK
b) ASK and PSK
c) PSK and FSK
d) None of the mentioned

6. Which has higher error probability performance?
a) Uni-polar base-band signalling
b) Bipolar base-band signalling
c) ASK
d) FSK

7. Time division multiplexing uses
a) High pass filter
b) Commutator
c) High pass filter & Commutator
d) None of the mentioned

8. In TDM, at the receiver end, ____ filter is used.
a) Low pass
b) High pass
c) Band pass
d) Band stop

9. Which provides more secure communication?
a) CDMA
b) FDMA
c) TDMA
d) None of the mentioned

10. Entropy is the measure of
a) Randomness
b) Information
c) Randomness & Information
d) None of the mentioned

11. Entropy calculation returns
a) Random variable
b) Deterministic number
c) Random number
d) None of the mentioned

12. Entropy of N random variables is the _____ of the entropy of individual random variable.
a) Sum
b) Product
c) Sum of squares
d) Average

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