RADIO RECEIVERS QUIZ

In a ratio detector

stabilization against signal strength variations is provided

the output is twice that obtainable from a similar phase discriminator

the circuit is the same as in a discriminator, except that the diodes are reversed

the linearity is worse than in phase discriminator

TRUE ANSWER : ?
YOUR ANSWER : ?

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

To permit easier tracking

To help the image frequency rejection

To allow adequate frequency coverage without switching

Because otherwise an intermediate frequency could not be produced

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Reducing the effect of noise at low modulation depths

Improving the selectivity of the receiver

Reducing the effect of negative-peak clipping

TRUE ANSWER : ?
YOUR ANSWER : ?

A receiver has poor IF selectivity. It will therefore also have poor

Diversion reception

Sensitivity

Double-spotting

Blocking

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Permit better adjacent-channel rejection

Provide improved tracking

Increase the tuning range of the receiver

Improve the rejection of the image frequency

TRUE ANSWER : ?
YOUR ANSWER : ?

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

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

Leak-type bias must be used

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate which of the following circuits could not demodulate SSB:

Product modulator

Balance modulator

Phase discriminator

BFO

TRUE ANSWER : ?
YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

Is not rejected be the IF tuned circuits

Is independent of the frequency to which the receiver is tuned

Is created within the receiver itself

Is due to insufficient adjacent channel rejection

TRUE ANSWER : ?
YOUR ANSWER : ?

Three-point tracking is achieved with

Double conversion

Double spotting

The padder capacitor

Variable selectivity

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate the false statement in connection with communications receivers.

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

Variable sensitivity is used to eliminate selective fading

TRUE ANSWER : ?
YOUR ANSWER : ?

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