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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Q. A linear diode detector uses RC filter. As modulation index increases the maximum permissible value of time constant RC

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Q. In SSB generation, the most commonly used filter is

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Q. The FM broadcast band is from

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Q. If k is Boltzmann's constant, T₀ is standard ambient temperature, δf is bandwidth of receiver, F is noise figure, the minimum receivable signal in a radar receiver is given by

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Q. The purpose of source coding is to

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Q. If a source of information generates messages at the rate of r messages per second and H is entropy, the information rate is

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Q. Consider the following statements about advantages of phase discriminator over slope detector

1. Fewer tuned circuits
2. Greater limiting
3. Better linearity
4. Easy alignment

Which of the above are true?

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