RADIO RECEIVERS QUIZ

A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is

2100 kHz

750 kHz

900 kHz

1650 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate the false statement. The superheterodyne receiver replaced the TRF receiver because the latter suffered from

Insufficient gain and sensitivity

Gain variation over the frequency coverage range

Inadequate selectivity at high frequencies

Instability

TRUE ANSWER : ?
YOUR ANSWER : ?

The controlled oscillator synthesizer is sometimes preferred over the direct one because

Its frequency stability is better

It is a simpler piece of equipment

It is relatively free of spurious frequency

It does not require crystal oscillator

TRUE ANSWER : ?
YOUR ANSWER : ?

Three-point tracking is achieved with

Double conversion

Double spotting

The padder capacitor

Variable selectivity

TRUE ANSWER : ?
YOUR ANSWER : ?

A low ratio of the ac to the dc load impedance of a diode detector results in

Poor AF response

Poor AGC operation

Diagonal clipping

Negative-peak clipping

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Leak-type bias must be used

The output must be tuned

The circuit is always biased in class C, by virtue of the leak-type bias.

When the input increases past the threshold of the limiting, the gain decreases to keep the output constant.

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate which of the following circuits could not demodulate SSB:

Phase discriminator

Product modulator

BFO

Balance modulator

TRUE ANSWER : ?
YOUR ANSWER : ?

In a ratio detector

the linearity is worse than in phase discriminator

the output is twice that obtainable from a similar phase discriminator

stabilization against signal strength variations is provided

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

TRUE ANSWER : ?
YOUR ANSWER : ?

In a radio receiver with simple AGC

The audio stage gain is normally controlled by the AGC

The highest AGC voltage is produced

An increase in signal strength produces more AGC

The faster the AGC time constant the more accurate the output

TRUE ANSWER : ?
YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

Is due to insufficient adjacent channel rejection

Is independent of the frequency to which the receiver is tuned

Is created within the receiver itself

Is not rejected be the IF tuned circuits

TRUE ANSWER : ?
YOUR ANSWER : ?