June 12, 2021

Modulation Techniques MCQ’s

Read Time:1 Minute, 27 Second

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

1. Every frequency has ____ orthogonal functions.
a) One
b) Two
c) Four
d) Six

2. QAM uses ______ as the dimensions.
a) In phase
b) Quadrature
c) In phase & Quadrature
d) None of the mentioned

3. Simulation is used to determine
a) Bit error rate
b) Symbol error rate
c) Bit error
d) Symbol error

4. FSK reception uses
a) Correlation receiver
b) PLL
c) Correlation receiver & PLL
d) None of the mentioned

5. If we correlate the received signal with any one of the two orthogonal function, the obtained inner product will be
a) In phase
b) Quadrature
c) Zero
d) Cannot be determined

6. In non coherent reception _____ is measured.
a) Phase
b) Energy
c) Power
d) None of the mentioned

7. Average energy per bit is given by
a) average energy symbol/log2 M
b) average energy symbol * log2 M
c) log2 M/ Average energy symbol
d) none of the mentioned

8. If we correlate the received signal with both orthogonal function the inner product will be
a) In phase
b) Quadrature
c) In phase and quadrature
d) Unity

9. Which system uses QAM?
a) Digital microwave relay
b) Dial up modem
c) Digital microwave relay & Dial up modem
d) None of the mentioned

10. Which is called as on-off keying?
a) Amplitude shift keying
b) Uni-polar PAM
c) Amplitude shift keying & Uni-polar PAM
d) None of the mentioned

11. Matched filter is a _____ technique.
a) Modulation
b) Demodulation
c) Modulation & Demodulation
d) None of the mentioned

12. Which FSK has no phase discontinuity?
a) Continuous FSK
b) Discrete FSK
c) Uniform FSK
d) None of the mentioned

13. Which has same probability of error?
a) BPSK and QPSK
b) BPSK and ASK
c) BPSK and PAM
d) BPSK and QAM

14. FSK reception is
a) Phase Coherent
b) Phase non coherent
c) Phase Coherent & non coherent
d) None of the mentioned

Happy
Happy
0 %
Sad
Sad
0 %
Excited
Excited
0 %
Sleepy
Sleepy
0 %
Angry
Angry
0 %
Surprise
Surprise
0 %

Average Rating

5 Star
0%
4 Star
0%
3 Star
0%
2 Star
0%
1 Star
0%

Leave a Reply

Your email address will not be published. Required fields are marked *

Previous post Modulation and Entropy MCQ’s
Next post Spread Spectrum, TDMA and FDMA MCQ’s