Exercise: Communication Systems

Questions for: Communication Systems

Assertion (A): A balun is an RF impedance matching transformer.

Reason (R): Sometimes a booster amplifier is used with a TV set.

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: B

Balun gives a 4 : 1 impedance transformation. In areas where TV reception is poor, booster is used to strengthen a TV signal.

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Computer communication networks have
A:
star configuration
B:
tree configuration
C:
loop/mesh configuration
D:
All of the above
Answer: D

All the three configurations are used.

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In a AM wave the carrier and one of the side bands is suppressed. If m = 0.5, the percentage saving in power is
A:
50%
B:
83.3%
C:
94.4%
D:
100%
Answer: C

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The power to the portable unit of a cordless telephone is provided by
A:
pencil cells
B:
dry cells
C:
rechargeable cells
D:
AC mains
Answer: C

Rechargeable cells feed the portable unit.

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If the oscillator output is modulated by audio frequencies upto 10 kHz, the frequency range occupied by the side bands will be
A:
711.9 kHz to 712.1 kHz
B:
702 kHz to 722 kHz
C:
692 kHz to 732 kHz
D:
71.2 kHz to 71.20 kHz
Answer: B

L = 50 mH, C = ln F

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