Digital Communications

Noise

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Which consists of less ISI?
Nyquist filter
Raised cosine filter
Nyquist & Raised cosine filter
None of the mentioned
Explanation:
Raised cosine filter results in less ISI than Nyquist filter.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
Shot noise is
Stochastic process
Poisson process
Stochastic & Poisson process
None of the mentioned
Explanation:
Shot noise is a Poisson process.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
Shot noise is produced by
Electrons
Photons
Electrons & Photons
None of the mentioned
Explanation:
Shot noise occurs due to particle like the behaviour of electron and photon.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Noise has
Infinite energy
Infinite power
Infinite energy & power
None of the mentioned
Explanation:
Noise has infinite energy signal.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which offers better SQNR?
Delta modulation
PCM
Delta modulation & PCM
None of the mentioned
Explanation:
PCM offers better SQNR than delta modulation.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Thermal noise is a wide sense stationary process.
True
False
Explanation:
Thermal noise is modeled as a wide sense stationary stochastic process.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Which has the same power spectral density?
White noise
Brown noise
White & Brown noise
None of the mentioned
Explanation:
White noise has same power spectral density where as it decreases in case of brown noise.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Capacity of a channel can be increased by
Increasing channel bandwidth
Increasing signal power
Increasing channel bandwidth &signal power
None of the mentioned
Explanation:
Capacity of a channel can be increased by increasing channel bandwidth and also by increasing signal power.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Flicker noise is called as
White noise
Pink noise
Brown noise
None of the mentioned
Explanation:
Flicker noise is called as pink noise.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Shot noise is avoidable when current is
Zero
One
Infinity
None of the mentioned
Explanation:
Shot noise is avoidable only when the current is zero.