1. Which offers better SQNR?
a) Delta modulation
b) PCM
c) Delta modulation & PCM
d) None of the mentioned
Explanation: PCM offers better SQNR than delta modulation.
2. Two functions are called as orthogonal if on integrating the product we get
a) One
b) Zero
c) Infinity
d) None of the mentioned
Explanation: Two functions are called as orthogonal if the integral value of integrating the product is zero.
3. Shot noise is avoidable when current is
a) Zero
b) One
c) Infinity
d) None of the mentioned
Explanation: Shot noise is avoidable only when the current is zero.
4. Shot noise is produced by
a) Electrons
b) Photons
c) Electrons & Photons
d) None of the mentioned
Explanation: Shot noise occurs due to particle like the behaviour of electron and photon.
5. Shot noise is
a) Poisson process
b) Stochastic process
c) Stochastic & Poisson process
d) None of the mentioned
Explanation: Shot noise is a Poisson process.
6. Which occurs due to equilibrium fluctuations?
a) Thermal noise
b) Johnson noise
c) Thermal & Johnson noise
d) None of the mentioned
Explanation: Thermal noise occurs due to equilibrium fluctuations. This noise is also called as Johnson noise.
7. Flicker noise is called as
a) White noise
b) Pink noise
c) Brown noise
d) None of the mentioned
Explanation: Flicker noise is called as pink noise.
8. Which has the same power spectral density?
a) Brown noise
b) White noise
c) White & Brown noise
d) None of the mentioned
Explanation: White noise has same power spectral density where as it decreases in case of brown noise.
9. Which noise is useful for dithering?
a) White noise
b) Pink noise
c) Brown noise
d) None of the mentioned
Explanation: Brown noise is sometimes useful for dithering.
10. Capacity of a channel can be increased by
a) Increasing channel bandwidth & signal power
b) Increasing signal power
c) Increasing channel bandwidth
d) None of the mentioned
Explanation: Capacity of a channel can be increased by increasing channel bandwidth and also by increasing signal power.