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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Q. Which of the following is likely to be associated with FM radio broadcasting?

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Q. Diffraction of EM waves

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Q. The start of modern computer age was started by the event

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Q. At night D layer of ionosphere is absent.

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Q. Which of the following is not correct?

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Q. Assertion (A): Data communication using digital data must be very accurate.

Reason (R): In analog signals redundancy is available but in digital signals redundancy is not available.

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Q. The number of repeaters in a coaxial cable link depends on

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Q. The overall noise temperature Te, absolute temperature T and noise figure F are related as

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Q. In binary data transmission DPSK is preferred to PSK because

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Q. A basic group B

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Q. By the use of which of the following the PPM can be converted to PWM?

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Q. In VCR the luminance signal is recorded by

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Q. Assertion (A): In digital communication data is coded prior to being transferred.

Reason (R): A number of codes for digital data processing are available.

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Q. In FM modulation pre-emphasis is done for

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Q. c(t) and m(t) are used to generate an AM signal. The modulation index of the generated AM signal is 0.5 then the quantity Total Sideband Power / Carrier Power is

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Q. High intermediate frequency in a superheterodyne receiver

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Q. In push button type telephone set, pressing a button generates

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