Digital Communications

Sampling and Quantization

Question 1
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 2
Marks : +2 | -2
Pass Ratio : 100%
In which mixing is easier?
Analog signal
Digital signal
Analog & Digital signal
None of the mentioned
Explanation:
Mixing of digital signals are easier than that of mixing analog signals.
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%
Transmitted pulse becomes distorted due to
Ideal transmission characteristic
Non ideal transmission characteristic
All of the mentioned
None of the mentioned
Explanation:
A transmitted pulse gradually becomes distorted due to non ideal transmission characteristic of the channel.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
To avoid aliasing
Reduce the bandwidth
Cut out high frequency
Reduce the bandwidth & Cut out high frequency
None of the mentioned
Explanation:
To avoid aliasing bandwidth should be reduced and high frequency should be cut out.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Using ARMA filter
Sampling can be done in real time
Gives sharp output
All of the mentioned
None of the mentioned
Explanation:
ARMA filter gives sharp output but sampling cannot be done in real time.
Question 7
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 8
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 9
Marks : +2 | -2
Pass Ratio : 100%
Which requires interpolation filtering?
Up-sampler
D to A converter
Up-sampler & D to A converter
None of the mentioned
Explanation:
Up-sampler and D to A conversion need interpolation filtering.
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.