1. Companding is used to
a) Increase the information transmission rate
b) Use only one carrier frequency to handle different signals
c) To use different frequency bands for different signals
d) To protect all small signals in PCM from quantizing noise
Answer
Answer: d [Reason:] Companding is used to protect all small signals in PCM from quantizing noise.
2. TDM is used to
a) Increase the information transmission rate
b) Use only one carrier frequency to handle different signals
c) To use different frequency bands for different signals
d) To protect all small signals in PCM from quantizing noise
Answer
Answer: b [Reason:] TDM is used to use only one carrier frequency to handle different signals.
3. Which has greater bandwidth?
a) TDM
b) FDM
c) TDM & FDM
d) None of the mentioned
Answer
Answer: b [Reason:] FDM has greater bandwidth.
4. Which has lower noise immunity?
a) TDM
b) FDM
c) TDM & FDM
d) None of the mentioned
Answer
Answer: a [Reason:] TDM has lower noise immunity.
5. TDM can be employed to transmit channels having unequal bandwidth,
a) True
b) False
Answer
Answer: a [Reason:] True. TDM can be employed to transmit channels having unequal bandwidth.
6. Using sampling theorem, analog signal cannot be reconstructed.
a) True
b) False
Answer
Answer: b [Reason:] Using sampling theorem analog signal can be reconstructed.
7. Which maintains better fidelity?
a) Analog communication
b) Digital communication
c) Analog & Digital communication
d) None of the mentioned
Answer
Answer: b [Reason:] Digital communication provides better fidelity control.
8. In which reusing of components can be made possible?
a) Analog communication
b) Digital communication
c) Analog & Digital communication
d) None of the mentioned
Answer
Answer: b [Reason:] In digital communication reusing of components is possible.
9. A mechanism for breaking the problem down is
a) Layering
b) Dividing
c) Abstraction
d) Entity sharing
Answer
Answer: c [Reason:] Abstraction is the mechanism of breaking the problem down.
10. In digital communication, interaction between ______ is possible.
a) Any layer to layer
b) One layer to next layer
c) Both of the mentioned
d) None of the mentioned
Answer
Answer: b [Reason:] In digital communication, in layers only one layer and its next layer can communicate.
