Exercise: Communication Systems

Questions for: Communication Systems

In audio cassettes the width of each recording track is
A:
5 mm
B:
2.5 mm
C:
1.5 mm
D:
1 mm
Answer: B

Each track is 2.5 mm wide.

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Quantizing error occurs in
A:
TDM
B:
FDM
C:
PCM
D:
PWD
Answer: C

An analog number cannot be converted into an exact digital number.

This is called quantizing error.

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When modulation index of an AM wave is increased from 0.5 to 1, the transmitted power
A:
remains the same
B:
increases by 25%
C:
increases by 33.3%
D:
increases by 50%
Answer: C

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A total of 16 equally probable events exist. If it is required to select one out of them, the number of required bits is
A:
2
B:
4
C:
3
D:
5
Answer: B

24 = 16.

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The saving of power in DSB-SC modulated at 80% is
A:
NIL
B:
80%
C:
75.76%
D:
50%
Answer: C

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