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Radio Receivers

Answer: C

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2.

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

Answer: A

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3.

As compared to tuned radio frequency receivers which of the following is the advantage of using superheterodyne receivers?

Answer: A

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4.

The output of a diode detector contains

Answer: D

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Answer: A

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6.

In a superheterodyne receiver, the IF is 455 kHz. If it is tuned to 1200 kHz, the image frequency will be

Answer: B

A signal (image) can interfere with a superheterodyne receiver if fits the following equation.

Image = Signal +/- 2 x I.F.

Which says that a signal has the capacity to interfere with a superhet receiver if its frequency is equal to the signal frequency (1200 kHz in our question) plus or minus twice the IF (455 kHz in our question).

So one possible image is: 1200 + ( 2 x 455 ) = 2110 kHz (possible).

And the other: 1200 - ( 2 x 455 ) = 290 kHz (not likely).

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7.

Which one of the following is not a useful quantity for comparing the noise performance of receivers?

Answer: C

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8.

Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

Answer: B

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9.

Which of the following statement about the advantage of phase discriminator over the slope detector is false?

Answer: C

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Answer: C

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