June 12, 2021

Baseband Transmission – 2 MCQ’s

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This set of Digital Communications Systems Multiple Choice Questions & Answers (MCQs) focuses on “Baseband Transmission – 2″.

1. Which waveform scheme introduces bandwidth compression?
a) Duobinary
b) Manchester coding
c) Phase encoded waveform
d) Multilevel codes

2. Some of the M-ary waveforms are
a) PAM
b) PPM
c) PDM
d) All of the mentioned

3. Which waveform type has the feature of clocking?
a) Manchester coding
b) Bbi-p-M
c) Delay modulation
d) NRZ-L

4. In pulse modulation, reciprocal of T(time) is
a) Bandwidth
b) Symbol rate
c) Signal voltage
d) None of the mentioned

5. In which waveform one is represented by half bit wide pulse positioned during the first half and zero is represented by half bit wide pulse positioned in the second half?
a) Bi-p-L
b) Bi-p-M
c) Bi-p-S
d) Delay modulation

6. Which waveform has the feature of error detection?
a) NRZ-L
b) RZ-AMI
c) Manchester coding
d) Duobinary

7. For both PPM and PDM _______ is kept constant.
a) Amplitude
b) Time period
c) Frequency
d) Number of levels

8. Which waveform type has better noise immunity?
a) NRZ
b) RZ
c) Phase encoded
d) Multilevel codes

9. PCM word size can be described by
a) Time period
b) Symbol rate
c) Number of quantization levels
d) None of the mentioned

10. Which binary waveform uses three levels?
a) Bipolar RZ
b) RZ-AMI
c) Bipolar RZ & RZ-AMI
d) None of the mentioned

11. Application of phase encoded binary signals are
a) Optical communication
b) Magnetic recording
c) Satellite telemetry
d) All of the mentioned

12. In M-ary PPM waveform, modulation is effected by
a) Delaying
b) Advancing
c) Delaying & Advancing
d) None of the mentioned

13. Which method should be implemented for reducing bandwidth?
a) Multilevel codes
b) Multilevel signalling
c) PAM
d) PDM

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