This set of Digital Communications Multiple Choice Questions & Answers (MCQs) focuses on “Noise”.
1. SQNR can be improved by _______ sampling rate.
a) Increasing
b) Decreasing
c) Does not depend
d) None of the mentioned
View Answer
Explanation: SQNR can be improved by increasing the sampling rate.
2. Which offers better SQNR?
a) Delta modulation
b) PCM
c) Delta modulation & PCM
d) None of the mentioned
View Answer
Explanation: PCM offers better SQNR than delta modulation.
3. Two functions are called as orthogonal if on integrating the product we get
a) One
b) Zero
c) Infinity
d) None of the mentioned
View Answer
Explanation: Two functions are called as orthogonal if the integral value of integrating the product is zero.
4. Eigen functions are not orthogonal.
a) True
b) False
View Answer
Explanation: An important property of eigen function is that they are orthogonal.
5. Shot noise is produced by
a) Electrons
b) Photons
c) Electrons & Photons
d) None of the mentioned
View Answer
Explanation: Shot noise occurs due to particle like the behaviour of electron and photon.
6. Shot noise is avoidable when current is
a) Zero
b) One
c) Infinity
d) None of the mentioned
View Answer
Explanation: Shot noise is avoidable only when the current is zero.
7. Shot noise is
a) Stochastic process
b) Poisson process
c) Stochastic & Poisson process
d) None of the mentioned
View Answer
Explanation: Shot noise is a Poisson process.
8. Which occurs due to equilibrium fluctuations?
a) Thermal noise
b) Johnson noise
c) Thermal & Johnson noise
d) None of the mentioned
View Answer
Explanation: Thermal noise occurs due to equilibrium fluctuations. This noise is also called as Johnson noise.
9. Flicker noise is called as
a) White noise
b) Pink noise
c) Brown noise
d) None of the mentioned
View Answer
Explanation: Flicker noise is called as pink noise.
10. Which has the same power spectral density?
a) White noise
b) Brown noise
c) White & Brown noise
d) None of the mentioned
View Answer
Explanation: White noise has same power spectral density where as it decreases in case of brown noise.
Sanfoundry Global Education & Learning Series – Digital Communications.
To practice all areas of Digital Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.
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