Bandwidth Efficient Modulation MCQ’s

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This set of Digital Communications Systems Multiple Choice Questions & Answers (MCQs) focuses on “Bandwidth Efficient Modulation”.

1. The bandwidth efficiency of MFSK is
a) M/log2M
b) log2M/M
c) M/log10M
d) log10M/M

2. Which modulation requires more bandwidth?
a) QPSK
b) OQPSK
c) BPSK
d) BFSK

3. Which technique can be used for bandwidth reduction?
a) BPSK
b) QPSK
c) MPSK
d) MFSK

4. The primary communication resource is
a) Transmitted power
b) Received power
c) Efficiency
d) None of the mentioned

5. Which modulation is the most efficient one?
a) BPSK
b) BFSK
c) QPSK
d) QAM

6. The bandwidth efficiency increases as M increases.
a) True
b) False

7. Greater the redundancy lesser is the bandwidth expansion.
a) True
b) False

8. Which modulation has lower side lobe levels?
a) QPSK
b) OQPSK
c) BPSK
d) MSK

9. Which modulation scheme uses nonlinear transponders?
a) MSK
b) Offset QPSK
c) MSK & Offset QPSK
d) None of the mentioned

10. QPSK amplitude modulates
a) Sine function
b) Cosine function
c) Sine & Cosine function
d) None of the mentioned

11. QPSK is a composite of
a) Two BPSK
b) Three BPSK
c) Two FSK
d) Two M-ary PSK

12. The bandwidth efficiency of QFSK is _______ that of BFSK.
a) Greater than
b) Less than
c) Equal to
d) None of the mentioned

13. QAM is a combination of
a) ASK and FSK
b) ASK and PSK
c) PSK and FSK
d) None of the mentioned

14. Which modulation spectrum has narrow main lobe?
a) QPSK
b) OQPSK
c) BPSK
d) MSK

15. Which modulation is spectrally more efficient?
a) BPSK
b) MSK
c) QPSK
d) OQPSK

16. The IF transmission bandwidth of MFSK is
a) M/T
b) T/M
c) 2M/T
d) M/2

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