Q. Selectivity varies with receiving frequency, frequency is raised.

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Q. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10¯⁵ ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is

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Q. In an FM signal, the power

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Q. RF amplifiers are used in radio receivers for

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Q. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is

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Q. Three point tracking can be achieved with

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Q. Double spotting in a receiver is due to

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Q. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of

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Q. The IF stage of a receiver employs

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Q. In a receiver, which of the following device has RF input but IF output?

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Q. Statement 1:
Diode is the most common device used for demodulation.

Statement 2:
A discriminator is a FM detector.

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Q. A receiver having poor IF selectivity will also have poor

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Q. The source of which of the following noise is different from that of the remaining?

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Q. The household radio receiver uses

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Q. In a transistor receiver, the use of FET as the first stage amplifier is likely to

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Q. In a FM waveform, the side bands are spaced at intervals equal to

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Q. Power spectral density of white noise

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Q. In radio receiver, the maximum contribution to noise is from

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Q. In a radio receiver

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Q. The sensitivity of a superheterodyne receiver is determined by

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