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. Double spotting in a receiver is due to

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Q. Three point tracking can be achieved with

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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. RF amplifiers are used in radio receivers for

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Q. In an FM signal, the power

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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. Selectivity varies with receiving frequency, frequency is raised.

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Q. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is

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Q. A padder is basically a/an

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Q. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to

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Q. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is

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