Digital Communications

Sampling and Quantization

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Shot noise occurs in
Transistors
Valves
Transistors & Valves
None of the mentioned
Explanation:
Shot noise occurs in both valves and transistors.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Different cases of sampling include
Ideal impulse sampling
Flat-topped sampling
Sampling with rectangular pulses
All of the mentioned
Explanation:
The three cases of sampling are ideal impulse sampling, sampling with rectangular pulses and flat topped sampling.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Auto-correlation function is a
Even function
Odd function
Even & Odd function
None of the mentioned
Explanation:
Auto-correlation function is an even function of time.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Which signals are function of time?
Random signal
Deterministic signal
Random & Deterministic signal
None of the mentioned
Explanation:
Deterministic signals are function of time.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which filter does not have sharp output?
Linear phase filter
Delayed symmetric filter
Linear phase & Delayed symmetric filter
None of the mentioned
Explanation:
Linear phase filter or delayed symmetric filter does not have sharp output but sampling can be done in real time.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Non uniform quantization includes
Compression
Expansion
Compression & Expansion
None of the mentioned
Explanation:
Compression and expansion give the feature of non uniform quantization.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which process requires low pass filter?
Up-sampling
Down-sampling
Up-sampling & Down-sampling
None of the mentioned
Explanation:
Up-sampling requires low pass filter after increasing the data rate and down-sampling requires low pass filter before decimation.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Reconstruction filter is difficult to implement in hardware.
True
False
Explanation:
Reconstruction filter is simpler and easy to implement in hardware.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
A to D conversion process uses
Sampler
Quantizer
Sampler & Quantizer
None of the mentioned
Explanation:
A to D conversion process requires both sampler and quantizer.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Original signal came to be retraced from sampled version using
Low pass filtering
High pass filtering
Low & High pass filtering
None of the mentioned
Explanation:
Original signal can be obtained from its sampled version by using low pass filtering.