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

Variable selectivity
Variable sensitivity
Squelch
Double conversion

ANSWER DOWNLOAD EXAMIANS APP

Radio Receivers
In a ratio detector

the output is twice that obtainable from a similar phase discriminator
the linearity is worse than in phase discriminator
the circuit is the same as in a discriminator, except that the diodes are reversed
stabilization against signal strength variations is provided

ANSWER DOWNLOAD EXAMIANS APP

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

Variable sensitivity is used to eliminate selective fading
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.
Double conversion is used to improve image rejection

ANSWER DOWNLOAD EXAMIANS APP