June 12, 2021

Modulation and Multiplexing MCQ’s

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

1. In bipolar codes, pulses can be
a) Positive
b) Negative
c) Absent
d) All of the mentioned

2. In time division, connection is established using
a) Data exchange
b) Galvanic connection
c) Data exchange & Galvanic connection
d) None of the mentioned

3. When probability of receiving a symbol is 1 then how much information will be obtained?
a) Little information
b) Much information
c) No information
d) None of the mentioned

4. To achieve high signal to noise ratio, delta modulation must use
a) Under sampling
b) Over sampling
c) Aliasing
d) None of the mentioned

5. Analogue switches provides
a) Good bandwidth
b) Low distortion
c) Low cost
d) All of the mentioned

6. Source of noise in delta modulation is
a) Granularity
b) Slope overload
c) Granularity & Slope overload
d) None of the mentioned

7. Space division has dedicated
a) Paths
b) Time slots
c) Paths & Time slots
d) None of the mentioned

8. Properties used to determine stream’s fidelity
a) Sampling rate
b) Bit depth
c) Sampling rate & Bit depth
d) None of the mentioned

9. Modulation process includes
a) Analog to digital conversion
b) Digital to analog conversion
c) All of the mentioned
d) None of the mentioned

10. In time division system, the actual switch is called as
a) Speech memory
b) Cross point
c) Connecting point
d) None of the mentioned

11. Delta modulation is ______ conversion.
a) Analog to digital
b) Digital to analog
c) Analog to digital and digital to analog
d) None of the mentioned

12. Operations performed by the switching system
a) Path establishment
b) Information exchange
c) Tariff computation
d) All of the mentioned

13. Switching exists in
a) Point to point communication
b) Broadcast communication
c) Point to point & Broadcast communication
d) None of the mentioned

14. The demodulator in delta modulation technique is
a) Differentiator
b) Integrator
c) Quantizer
d) None of the mentioned

15. In channel encoding procedure
a) Redundancy bits are added
b) Errors are corrected
c) Redundancy bits are added & Errors are corrected
d) None of the mentioned

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