Exercise: Communication Systems

Questions for: Communication Systems

The modulation index of wideband FM signal is
A:
less than unity
B:
unity
C:
greater than unity
D:
nearly 0.67
Answer: C
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The pre-emphasis circuit is used
A:
prior to modulation
B:
after demodulation
C:
for low frequency components of the signal
D:
none of the above
Answer: A
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Which of the following could be the equation for non-linear resistor shown in figure?
A:
a + be + ce2 + de3
B:
a - be - ce2 - de3
C:
a + be + ce2 - de3
D:
a + be - ce2 - de3
Answer: A
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An SSB-AM signal cannot be demodulated by
A:
Balanced modulator
B:
Complete phase shift generator
C:
Diode balanced modulator
D:
Product detector
Answer: A
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The message carrying efficiency is best in
A:
AM
B:
FM
C:
AM-SC
D:
Phase modulation
Answer: C
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