Q. Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is

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Q. In radar display system PPI stands for

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Q. When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to

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Q. A pre-emphasis circuit provides extra noise immunity by

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Q. The function of a modulator is to

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Q. Which of the following radio waves are not reflected by ionosphere?

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Q. Square law modulators utilise

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Q. Which of the following is a disadvantage of Vestigial Sideband (VSB) system?

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Q. The maximum permissible distance between two samples of a 2 kHz signal is

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Q. When the video signal is applied to the picture tube in a TV receiver, the strength of video signal is about

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Q. In the above case if the modulating frequency is increased to 20 kHz the bandwidth will be

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Q. A CW transmitter radiates

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Q. The commonly employed filter in SSB generation is

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Q. The storage capacity of a CD is

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Q. Which of the following pulse modulation is analog?

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Q. Pulse stuffing is used in

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Q. In a modulator it is found that the amplitude spectrum consists a component at fc, the carrier frequency and one component each at fc - fs and fc + fs where fs is the modulating signal frequency. Then the modulator used is

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Q. Frequency shift keying is used mostly in

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Q. Troposphere is the portion of atmosphere

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Q. Earth's curvature affects the effective height of antenna.

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