Radio Receivers

In an FM signal, the power

A:

increases as the modulation index increases

B:

reduces as the modulation index increase

C:

increases as the modulation index decreases

D:

remains constant when the modulation index increases

Answer: D

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In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is

A:

Armstrong oscillator

B:

Colpitts oscillator

C:

Clapp oscillator

D:

Ultra Audio oscillator

Answer: A

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The passband of the tuned circuits of a radio receiver should be equal to

A:

20 kHz

B:

455 kHz

C:

1455 kHz

D:

more than 455 kHz

Answer: A

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Which of the following produces upper and lower side frequencies?

A:

Microphone

B:

Demodulator in a superheterodyne receiver

C:

Modulator in a. radio transmitter

D:

Oscillator in a receiver

Answer: A

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Fidelity of a receiver represents

A:

the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output

B:

the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies

C:

the variation of the output with the modulation frequency when the output impedance is a resistance

D:

none of the above

Answer: C

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Questions for: Radio Receivers