Electrical Engineering · Question Bank

Communications

408 questions · page 21 of 21. Answer in your head first, then check the solution.

📘 EE Mock Board Exam

#401

Receiver interference is not reduced by including a/an

Acrystal filter

Binsulating enclosures around the receiver

Cwave trap

DRF stage

#402

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

#403

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

#404

For many types of voices, what is the ratio of PEP-to-average power during a modulation peak in a single-sideband phone signal?

AApproximately 1.0 to 1

BApproximately 25 to 1

CApproximately 100 to 1

DApproximately 2.5 to 1

#405

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

Ahigher

Blower

Cthe same

D10 kHz above

#406

Features of a transmitter's buffer stage include

Ahigh gain

Bharmonic generation

Cimprovement in frequency stability of the oscillator

Dlow input impedance

#407

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

#408

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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