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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 20
21.
When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to
ωm
ω2m
1/ωm
1/ω2m
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
A pre-emphasis circuit provides extra noise immunity by
converting the phase modulation of FM
preamplifying the whole audio band
amplifying the higher audio frequencies
boosting the pass frequencies
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The ratio for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is
mf2
m2f
mf3
m3f
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.
The function of a modulator is to
separate two frequencies
extract information from the carrier
amplify the audio frequency signal
impress the information on to a RF carrier
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
Which of the following radio waves are not reflected by ionosphere?
Waves above 1 kHz
Waves above 1 MHz
Waves above 10 MHz
Waves above 30 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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