ECE :: Radio Receivers
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The selectivity curve of a standard receiver is represented by
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Which of the following statement about the advantage of phase discriminator over the slope detector is false?
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Fidelity of a receiver represents
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Which of the following produces upper and lower side frequencies?
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The passband of the tuned circuits of a radio receiver should be equal to
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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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RF amplifiers are used in radio receivers for
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In an FM signal, the power
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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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Selectivity varies with receiving frequency, frequency is raised.
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A.
the sensitivity expressed in terms of voltage that must be applied to the receiver input to give a standard output
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B.
the extent to which the receiver is capable of distinguishing between the desired signal and other frequencies
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C.
the variation of the output with the modulation frequency when the output impedance is a resistance
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D.
none of the above
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