Q. A duplexer is a device used to

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Q. A heterodyne frequency changer is called a

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Q. RF amplifiers are used in radio receivers for

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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 input resistance of the detector is

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Q. The output of a diode detector contains

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Q. Which of the following noise does not occur in transistors?

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Q. Noise generated in a resistor is also known as

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Q. Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?

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Q. The noise generated by a resistor depends upon

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Q. In a superheterodyne receiver

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Q. The function of an AM detector circuit is to

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Q. Which of the following should be used in order to prevent overloading or the last IF amplifier in a receiver?

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Q. Most popular IF for receivers tuning to 540 to 1650 kHz is

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Q. In superheterodyne receivers, the local oscillator is used to

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Q. Which of the following is same in AM and FM receivers?

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Q. A notch filter is sometimes used in communication receivers to

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Q. Which one of the following is not a useful quantity for comparing the noise performance of receivers?

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Q. Which of the following statement about the amplitude limiter is not valid?

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Q. In a radio receiver, if the intermediate frequency is too low

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Q. FM amplifier in a superheterodyne receiver

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