Radio Receivers
To prevent overloading of the IF amplifier in a receiver, one should use

Double conversion
Variable sensitivity
Variable selectivity
Squelch

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Radio Receivers
Show which of the following statements about the amplitude limiter is untrue:

Leak-type bias must be used
When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.
The circuit is always biased in class C, by virtue of the leak-type bias.
The output must be tuned

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Radio Receivers
In a radio receiver with simple AGC

The audio stage gain is normally controlled by the AGC
The highest AGC voltage is produced
The faster the AGC time constant the more accurate the output
An increase in signal strength produces more AGC

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