Digital Communication Interview Questions & Answers on “Noise -2”.
1. Which noise is useful for dithering?
A. White noise
B. Pink noise
C. Brown noise
D. None of the mentioned
Answer: C
Clarification: Brown noise is sometimes useful for dithering.
2. Capacity of a channel can be increased by
A. Increasing channel bandwidth
B. Increasing signal power
C. Increasing channel bandwidth &signal power
D. None of the mentioned
Answer: C
Clarification: Capacity of a channel can be increased by increasing channel bandwidth and also by increasing signal power.
3. Capacity of the channel can be increased by reducing in band noise power.
A. True
B. False
Answer: A
Clarification: Capacity of a channel can be increased by reducing the in band noise power.
4. Noise has
A. Infinite energy
B. Infinite power
C. Infinite energy & power
D. None of the mentioned
Answer: A
Clarification: Noise has infinite energy signal.
5. Thermal noise is
A. Energy signal
B. Power signal
C. Energy & Power signal
D. None of the mentioned
Answer: B
Clarification: Thermal noise is considered as power signal as it has infinite energy.
6. Thermal noise is a wide sense stationary process.
A. True
B. False
Answer: A
Clarification: Thermal noise is modeled as a wide sense stationary stochastic process.
7. The maximum likelihood function is
A. Positive
B. Negative
C. Any of the mentioned
D. None of the mentioned
Answer: A
Clarification: The maximum likelihood function is always positive.
8. Matched filtering operation includes
A. Spectral phase matching
B. Spectral amplitude matching
C. Spectral phase & amplitude matching
D. None of the mentioned
Answer: C
Clarification: Matched filtering includes two operations – spectral amplitude matching and spectral phase matching.
9. Matched filter is
A. Linear
B. Non linear
C. Linear & Non linear
D. None of the mentioned
Answer: A
Clarification: Matched filter is a linear filter.
10. Which consists of less ISI?
A. Nyquist filter
B. Raised cosine filter
C. Nyquist & Raised cosine filter
D. None of the mentioned
Answer: B
Clarification: Raised cosine filter results in less ISI than Nyquist filter.
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