Electrical Engineering · Question Bank

Communications

386 of 408 questions match · page 20 of 20. Answer in your head first, then check the solution.

#381📘 reviewer_appEasy

What is the approximate dc input power to a class AB RF power amplifier stage in an unmodulated carrier transmitter when the PEP output is 500 W?

AApproximately 1000 W

BApproximately 800 W

CApproximately 250 W

DApproximately 600 W

#382📘 reviewer_appEasy

Which of the following stages in an FM receiver is responsible for drastically reducing the effect of static noise during the reception of a signal?

ADe-emphasis circuit

BMixer stage

CSquelch circuit

DLimiter stage

#383📘 reviewer_appEasy

In most mixers, the oscillator frequency is ______ than the carrier frequency of the input signal.

Ahigher

Blower

Cthe same

D10 kHz above

#384📘 reviewer_appEasy

Features of a transmitter's buffer stage include

Ahigh gain

Bharmonic generation

Cimprovement in frequency stability of the oscillator

Dlow input impedance

#385📘 reviewer_appEasy

Receiver desensitizing can be reduced by

Aincreasing the transmitter audio gain

Bdecreasing the receiver squelch gain

Cincreasing the receiver bandwidth

Densuring good RF shielding between the transmitter

#386📘 reviewer_appEasy

In a narrow-band FM system, the deviation ratio is commonly one and the highest audio frequency is generally limited to

A300 Hz

B10,000 Hz

C3,000 Hz

D7,500 Hz

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