Q. In a PCM system, if we increase the quantization levels from 2 to 8, how do the relative bandwidth requirements vary?

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Q. If the target area is small compared to wavelength of radar the situation is called

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Q. An FM transmitter has maximum frequency deviation of 75 kHz and reproduces audio signals up to 15 kHz. Minimum channel width required is __________ kHz.

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Q. A 360 W carrier is simultaneously modulated by two audio wave with modulation percentage of 55 and 65 respectively. Total sideband power radiated will be

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Q. In a radio detector

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Q. ISDN stands for

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Q. Under identical conditions, for a single modulating frequency, FM and PM are indistinguishable. Now if the modulating frequency is reduced, then

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Q. The percentage saving in power when the carrier and one of the sidebands are suppressed in an AM wave modulated to a depth of 100% will be nearly

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Q. The difference between phase and frequency modulation

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Q. A signal m(t) amplitude modulates a carrier Ac cos ωct. The final signal will be

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Q. An oscillator at 4.2 MHz is followed by two frequency doublers and two triplers. The output frequency will be

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Q. Over which frequency range the effect of atmospheric noise is significant?

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Q. In an AM system, doubling of modulation index doubles the antenna current. The system is

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Q. A frequency multiplier stage should operate as

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Q. UHF range is

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Q. A carrier signal at frequency 100 MHz is frequency modulated with modulation index 2 by a signal at 2 kHz. At what frequencies are the sidebands produced?

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Q. Which is not purpose of modulation?

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Q. If ω is the frequency of modulating voltage in FM, the modulation index is proportional to

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Q. Which camera tube has gamma of almost unity?

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Q. The baud rate is

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