Radio Receivers
One of the following cannot be used to demodulate SSB:

Product detector
Diode Balance modulator
Bipolar transistor balanced modulator
Complete phase-shift generator

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

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

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Radio Receivers
In a broadcast superheterodyne receiver, the

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

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Radio Receivers
The local oscillator of a broadcast receiver is tuned to a frequency higher than the incoming frequency

Because otherwise an intermediate frequency could not be produced
To allow adequate frequency coverage without switching
To permit easier tracking
To help the image frequency rejection

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