Q. The bandwidth required for amplitude modulation is

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Q. In a system using QASK and 4 bits to form a symbol, the required bandwidth is

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Q. Each of the following statements regarding frequency modulation is true except

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Q. Assertion (A): Radio transmission is by sky waves

Reason (R): Waves having frequencies higher than 30 MHz penetrate the atmosphere and do not return to earth.

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Q. During playback the take up reel is

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Q. To avoid objectionable noise in a microwave TV link, the SNR should be about

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Q. Which one of the following is not necessarily an advantage of the phase cancellation method of obtaining SSB over the filter method?

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Q. Pulse modulation is used in

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Q. In an amplitude modulated waveform, the amplitude of the sideband is

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Q. In communication systems the frequency range used for voice is

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Q. As EM waves travel in free space they get

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Q. Cross talk is due to reception of portions of a signal from one channel into another.

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Q. If there are M equally likely and independent messages and M = 2ᴺ where N is an integer, the information in each message is equal to

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Q. A radar beacon is a small radar set having a receiver, a separate transmitter and an antenna.

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Q. In the above case the total power in the modulated wave double sideband, suppressed carrier AM will be

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Q. If the plate supply voltage for a plate modulated class C amplifier is E, the maximum plate cathode voltage could be almost as high as

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Q. If the carrier of a 100 percent modulated AM wave is suppressed, the percentage power saving will be

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Q. The characteristics of H and V sync pulses in a colour TV receiver are

1. H sync, pulses are narrow and have frequency of 15625 Hz
2. V sync, pulses are much wider and have frequency of 50 Hz
3. H and V pulses have almost the same size but frequencies of 15625 and 50 Hz respectively
4. V sync, pulses are very narrow but H sync, pulses are wide and their frequencies are 15625 Hz and 50 Hz respectively

Which of the above are correct?

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Q. Bandwidth for practical PCM system is (where n is no. of channels, N length of PCM codes)

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Q. Circuit switching, Message switching and Packet Switching Network belong to which of the following systems?

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