Exercise: Communication Systems

Questions for: Communication Systems

In FM 'guard band' is provided
A:
to limit upper frequency limit
B:
to limit lower frequency limit
C:
so that there is less adjacent channel interference
D:
to limit transmitted power of a station
Answer: C
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The block diagram of AM transmitter in which high level modulation is used as shown in figure. The block X could be
A:
audio power amplifier
B:
buffer RF amplifier
C:
compressor amplifier
D:
none of the above
Answer: B
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The VLF, LF and MF antennas are
A:
horizontally polarized
B:
vertically polarized
C:
non linearly polarized
D:
either (a) or (b)
Answer: B
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Assertion (A): SSB transmitter is generally smaller than AM transmitter

Reason (R): SSB systems mostly use combined transmitter receiver.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: D
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Coupling and bypass filters can be a source of
A:
low-frequency parasitics
B:
high-frequency parasitics
C:
carrier frequency parasitics
D:
none of the above
Answer: B
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