Digital Communication Questions and Answers, Set 1

Digital Communication Questions and Answers

Q1. 

In the digital communication system, signals in different frequency bands are

Answer : 

Orthogonal

Q2. 

In down-conversion multiplication with cosine wave is followed by

Answer : 

Low pass filter

Q3. 

A band-pass signal has a Fourier transform equal to

Answer : 

Zero

Q4. 

Which are non negative functions?

Answer : 

PDF & PMF

Q5. 

In a communication system, a process in which statistical averages and time averages are equal is called as

Answer : 

Ergodic

Q6. 

Satellite communication takes place in

Answer : 

Ultra & Super high frequency band

Q7. 

Which has minimum power loss during transmission?

Answer : 

Twisted Copper cable at 1KHz

Q8. 

Modulation channel does not accept an analog input signal.

Answer : 

False

Q9. 

Which is practically realizable?

Answer : 

A train of pulses

Q10. 

Wired channels are

Answer : 

Lossy

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