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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Q. In which of the following frequency bands are the standard AM radio broadcast stations?

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Q. The frequency tolerance for the RF carrier in the standard AM radio broadcast band is

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Q. If carrier is modulated by a digital bit stream having one of the possible phases of 0°, 90°, 180°, and 270°, then modulation is called

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Q. In FM, the frequency deviation is

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Q. If fh(t) is the Hilbert transform of f(t), and f(t) is a real valued signal, the pre-envelope of f(t) is

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Q. Speech amplifiers are usually operated as

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Q. In which frequency range is the noise figure in a transistor independent of frequency

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