Q. In MF range, increasing the transmitter power

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Q. The most frequent users of long distance VLF transmission is

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Q. BFO stands for

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Q. SSB-SC stands for

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Q. A lens has a hyperfocal distance of 7.5 m. It is focused at 7.5 m. Then

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Q. In FM 'guard band' is provided

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Q. Assertion (A): FM requires more bandwidth than AM

Reason (R): Wide band FM is used for broadcast transmissions.

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Q. A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output, frequency for the carrier will be

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Q. In FSK no synchronous carrier is needed at the receiver

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Q. When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant. The modulation system is

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Q. Vividh Bharti programme is transmitted in

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Q. In a Vidicon camera tube, the beam current is controlled by

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Q. If D is diagonal and F is focal length, lens angle θ is

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Q. Present day stereophonic systems have

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Q. RF choke used for suppressing interference in TV is generally

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Q. Indicate the false statement: To combat noise

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Q. Audio and video signals are called modulating waves.

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Q. Johnson noise is

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Q. Which of the following is unlikely to happen when quantising noise is decreased in PCM?

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Q. For real and odd signals, the Fourier series coefficient an is

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