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Data Communication and Computer Networks Objective Questions and Answers

Questions
1 Optical transmission mainly uses
A WDM
B FDM
C TDM
D CDM

Answer: Option [C]

In optical transmission many low rate digital signals can be time division multiplexed.

2 Which of the following is necessary to use for separating channels in FDM ?
A time slots
B band pass filters
C differentiation
D none of these

Answer: Option [B]

Band pass filter is necessary to use for separating channels in FDM. A Band Pass Filter allows to pass a specific range of frequencies. During transmission it blocks lower and higher frequencies.

3 Guard bands increase the bandwidth for
A FDM
B TDM
C CDM
D None of these above

Answer: Option [A]

In FDM overlapping is not possible because of guard bands.

4 For separate channels in TDM, it is necessary to use
A time slots
B bandpass filters
C differentiation
D none of the above

Answer: Option [A]
5 When useful bandwidth of medium exceeds the required bandwidth of signals to be transmitted we use
A frequency division multiplexing
B time division multiplexing
C code division multiplexing
D none of the above

Answer: Option [A]
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