Sampling and Quantization

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This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Sampling and quantization”.

1. Which signals are function of time?
a) Random signal
b) Deterministic signal
c) Random & Deterministic signal
d) None of the mentioned

2. Auto-correlation function is a
a) Even function
b) Odd function
c) Even & Odd function
d) None of the mentioned

3. Shot noise occurs in
a) Transistors
b) Valves
c) Transistors & Valves
d) None of the mentioned

4. Source coding reduces
a) Redundancy
b) Average bit rate
c) Redundancy & Average bit rate
d) None of the mentioned

5. Delay element in delta modulation acts as
a) First order predictor
b) Second order predictor
c) Third order predictor
d) Fourth order predictor

6. Non uniform quantization includes
a) Compression
b) Expansion
c) Compression & Expansion
d) None of the mentioned

7. The quantization will be finer when
a) Smaller the number of discrete amplitudes
b) Larger the number of discrete amplitudes
c) Does not depend on amplitudes
d) None of the mentioned

8. Different cases of sampling include
a) Ideal impulse sampling
b) Flat-topped sampling
c) Sampling with rectangular pulses
d) All of the mentioned

9. Transmitted pulse becomes distorted due to
a) Ideal transmission characteristic
b) Non ideal transmission characteristic
c) All of the mentioned
d) None of the mentioned

10. In which mixing is easier?
a) Analog signal
b) Digital signal
c) Analog & Digital signal
d) None of the mentioned

11. Which filter does not have sharp output?
a) Linear phase filter
b) Delayed symmetric filter
c) Linear phase & Delayed symmetric filter
d) None of the mentioned

12. Using ARMA filter
a) Sampling can be done in real time
b) Gives sharp output
c) All of the mentioned
d) None of the mentioned

13. To avoid aliasing
a) Reduce the bandwidth
b) Cut out high frequency
c) Reduce the bandwidth & Cut out high frequency
d) None of the mentioned

14. Which requires interpolation filtering?
a) Up-sampler
b) D to A converter
c) Up-sampler & D to A converter
d) None of the mentioned

15. A to D conversion process uses
a) Sampler
b) Quantizer
c) Sampler & Quantizer
d) None of the mentioned

16. Reconstruction filter is difficult to implement in hardware.
a) True
b) False

17. Which process requires low pass filter?
a) Up-sampling
b) Down-sampling
c) Up-sampling & Down-sampling
d) None of the mentioned

18. Decreasing the data rate is called as
a) Aliasing
b) Down sampling
c) Up sampling
d) None of the mentioned

19. Original signal came to be retraced from sampled version using
a) Low pass filtering
b) High pass filtering
c) Low & High pass filtering
d) None of the mentioned

20. The signal can be reconstructed
a) At Nyquist rate
b) Above Nyquist rate
c) At & above the Nyquist rate
d) None of the mentioned

21. Which device is needed for the reconstruction of signal?
a) Low pass filter
b) Equalizer
c) Low pass filter & Equalizer
d) None of the mentioned

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