Exercise: Communication Systems

Questions for: Communication Systems

When the length of antenna is a whole wavelength
A:
the radiation at right angles is zero
B:
the radiation at right angles is maximum
C:
the radiation is zero in all directions
D:
the radiation is maximum in all directions
Answer: A
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Which of the following is an indirect way of generating FM?
A:
Armstrong modulator
B:
Varactor diode modulator
C:
Reactance FET modulator
D:
Reactance bipolar transistor
Answer: A
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Assertion (A): SSB systems generally have duplex operation

Reason (R): SSB systems are generally used in two way communication.

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
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A tape recorder and deck are entirely similar.
A:
True
B:
False
C:
D:
Answer: A
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Transistor T1 operates at 30 kHz and T2 operates at 300 Hz. The flicker noise is
A:
not depend on frequency
B:
T1 > T2
C:
T1 = T2
D:
T1 < T2
Answer: D
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