Radio Receivers
One of the main functions of the RF amplifier in a superheterodyne receiver is to

Improve the rejection of the image frequency
Provide improved tracking
Increase the tuning range of the receiver
Permit better adjacent-channel rejection

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Radio Receivers
Indicate the false statement in connection with communications receivers.

Double conversion is used to improve image rejection
Variable sensitivity is used to eliminate selective fading
A product demodulator could be used for the reception of Morse code.
The noise limiter cuts off the receiver’s output during a noise pulse.

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Radio Receivers
If a FET is used as the first AF amplifier in a transistor receiver, this will have the effect of

Reducing the effect of noise at low modulation depths
Reducing the effect of negative-peak clipping
Improving the effectiveness of the AGC
Improving the selectivity of the receiver

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