MGVCL EXAM PAPER (30-07-2021 SHIFT 3) QUIZ

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

To help the image frequency rejection

To allow adequate frequency coverage without switching

To permit easier tracking

Because otherwise an intermediate frequency could not be produced

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Squelch

Variable selectivity

Variable sensitivity

Double conversion

TRUE ANSWER : ?
YOUR ANSWER : ?

The image frequency of a superheterodyne receiver

Is created within the receiver itself

Is due to insufficient adjacent channel rejection

Is independent of the frequency to which the receiver is tuned

Is not rejected be the IF tuned circuits

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Gain variation over the frequency coverage range

Inadequate selectivity at high frequencies

Instability

Insufficient gain and sensitivity

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate which of the following circuits could not demodulate SSB:

Phase discriminator

BFO

Product modulator

Balance modulator

TRUE ANSWER : ?
YOUR ANSWER : ?

Three-point tracking is achieved with

Variable selectivity

Double conversion

The padder capacitor

Double spotting

TRUE ANSWER : ?
YOUR ANSWER : ?

In a radio receiver with simple AGC

The highest AGC voltage is produced

An increase in signal strength produces more AGC

The audio stage gain is normally controlled by the AGC

The faster the AGC time constant the more accurate the output

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate which of the following statements about the advantages of the phase discriminator over the slope detector is false:

Better linearity

Greater limiting

Fewer tuned circuits

Much easier alignment

TRUE ANSWER : ?
YOUR ANSWER : ?

Indicate the false statement in connection with communications receivers.

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

The noise limiter cuts off the receiver’s output during a noise pulse.

TRUE ANSWER : ?
YOUR ANSWER : ?

An AM receiver uses a diode detector for demodulation. This enables it satisfactorily to receive

ISB

Single-sideband, reduced-carrier

Single-sideband, suppressed-carrier

Single-sideband, full-carrier

TRUE ANSWER : ?
YOUR ANSWER : ?