Constant Envelope Modulation MCQ’s

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This set of Wireless & Mobile Communications Multiple Choice Questions & Answers (MCQs) focuses on “Constant Envelope Modulation”.

1. In constant envelope family of modulation, class C amplifiers introduces degradation in spectrum occupancy.
a) True
b) False

2. Constant envelope modulation techniques occupy ______ bandwidth than linear modulation schemes.
a) Larger
b) Smaller
c) Same
d) Twice

3. In non-linear modulation, the amplitude of the carrier varies with the variation of modulating signal.
a) True
b) False

4. In BFSK __________ of constant amplitude carrier signal is switched between two values.
a) Phase
b) Angle
c) Frequency
d) Amplitude

5. What is the modulation index of MSK?
a) 0.1
b) 1
c) 0.5
d) 0

6. MSK stands for ________
a) Maximum shift keying
b) Minimum shift keying
c) Minimum space keying
d) Maximum space keying

7. The modulation index of an FSK signal is similar to modulation index of ________
a) Amplitude modulation
b) Phase modulation
c) QPSK
d) Frequency modulation

8. MSK is sometimes also referred as _________
a) Slow FSK
b) Fast FSK
c) Slow PSK
d) Fast PSK

9. The name minimum phase shift keying implies minimum _________
a) Frequency separation
b) Amplitude separation
c) Phase change
d) Amplitude deviation

10. Which of the following is not a property of MSK?
a) Variable envelope
b) Spectral efficiency
c) Good BER performance
d) Self synchronizing capability

11. GMSK is a ________ of MSK.
a) Integral
b) Opposite
c) Derivative
d) Similar

12. MSK is a special form of OQPSK.
a) True
b) False

13. MSK has complex demodulation and synchronization circuits.
a) True
b) False

14. Which of the following holds true for GMSK?
a) Minimum ISI
b) Minimum error rate
c) Good spectral efficiency
d) Variable envelope property

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