Q. In a hi-fi system the frequency response over the audio frequency range should be within

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Q. Multiplex techniques are used for

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Q. If a signal band limited for fm is sampled at a rate less than 2 fm the reconstructed signal will be

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Q. A better SNR can be obtained in a PCM by

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Q. The baud rate is

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Q. The type of noise that interfere very much with high frequency transmission is

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Q. In communication systems, the modulating signal is also called

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Q. In the human eye, an image persists for a time of about

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Q. The different channels in a TDM receiver are separated by

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Q. In a pulsed RADAR typical value of pulse duration and pulse frequency respectively are

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Q. In a hi-fi system the nonlinear distortion should be less than

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Q. A pure tone at 1000 Hz has a dB level of 50 dB. If two such tones exist simultaneously the dB level is about

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Q. Hue of a colour means

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Q. Consider the following statement:
The radar pulse must be flat topped to

1. allow accurate range measurement
2. allow good minimum range
3. prevent frequency changes in magnetron
4. make the returned echoes easier to distinguish from noise.

Which of the above are correct?

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Q. Filter method and phasing method are the methods for generating

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Q. In amplitude modulation

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Q. Which one the following is an advantage of AM over FM?

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Q. In a wave the electric field lines are vertical. Then the wave is

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Q. In FM and AM the ratio of signal to noise ratio at the detector output least depends upon

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Q. Which of the following can provide two or more voice circuits with the same carrier?

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