Q. The highest modulating frequency typically used in AM systems is

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Q. The line of sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized, for best reception to the receive antenna should be

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Q. The bandwidth of FM for Commercial Purpose is

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Q. In home tape recorders the tape width is 2 inches.

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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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