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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Q. An amplitude modulated wave is

e = 50 (1 + 0.4 cos 1000 t + 0.3 cos 10000 t) cos 10⁷ t

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Q. The efficiency of a horn speaker is about

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Q. In AM, if modulation index is more than 100%, then

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Q. The width of air gap on recording head in a tape recorder is about

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Q. In a stereo tape recorder the speed of the tape is

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Q. Which of the following refers to SSB suppressed carrier amplitude modulated system?

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Q. The frequency at which the piezoelectric effect occurs is primarily determined by

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Q. In a 4-ary FSK, the frequencies are separated by fs. Then they are

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Q. In cell communication, cell stands for

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