Radio Receivers
In a broadcast superheterodyne receiver, the

RF amplifier normally works at 455 kHz above the carrier frequency
Local oscillator frequency is normally double the IF
Mixer input must be tuned to the signal frequency
Local oscillator operates below the signal frequency

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

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

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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

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

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