Exercise: Communication Systems

Questions for: Communication Systems

The number of noise sources in a BJT are
A:
3
B:
2
C:
1
D:
4
Answer: A

Shot noise, partition noise and thermal noise.

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In colour TV receiver, varactor diode is used for
A:
detection
B:
rectification
C:
tuning
D:
both (a) and (b)
Answer: C

In varactor diode the applied reverse bias controls the width and therefore capacitance of depletion layer.

This capacitance is used for tuning.

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In FM signal with a modulation index mf is passed through a frequency tripler. The wave in the output of the tripler will have a modulation index of
A:
mf
B:
3mf
C:
mf/3
D:
mf/9
Answer: B

Frequency multiplier increase the deviation,

.

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The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of
A:
frequency adjustment
B:
frequency interleaving
C:
frequency changing
D:
frequency amalgamation
Answer: B

In frequency interleaving the space between bundles is used for colour signal.

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A woofer should be fed from the input through a
A:
low pass filter
B:
high pass filter
C:
band pass filter
D:
band stop filter
Answer: A

Woofer is a low frequency loud speaker covering the range 16 Hz to 500 Hz.

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