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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 14
31.
The percentage saving in power when the carrier and one of the sidebands are suppressed in an AM wave modulated to a depth of 100% will be nearly
50%
66%
75%
83%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
The difference between phase and frequency modulation
is purely of academic interest
lies in the different definitions of the modulation index
lies in the poor audio response of phase modulation
is too great to make the two systems compatible
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
A signal m(t) amplitude modulates a carrier Ac cos ωct. The final signal will be
[Ac m(t)] cos ωct]
Ac . [1 + m(t)] cos ωct
Ac + [m(t)] cos ωct
Ac cos ωct + m(t)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
An oscillator at 4.2 MHz is followed by two frequency doublers and two triplers. The output frequency will be
84 MHz
112.4 MHz
151.2 MHz
303.4 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Over which frequency range the effect of atmospheric noise is significant?
Over 35 MHz
Below 30 MHz
Between 30 MHz and 100 MHz
Between 100 MHz and 150 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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