Objective Communications Questions – Electrical Engineering (Page 11)

#201📘 reviewer_appEasy

Bias for a class C amplifier produced by an input RC network is known as

ASignal bias

BSelf bias

CFixed external bias

DTreshold bias

#202📘 reviewer_appEasy

Collector current in a class C amplifier is a

ASine wave

BHalf sine wave

CPulse

DSquare wave

#203📘 reviewer_appEasy

The maximum power of a typical transistor RF power amplifier is in what range?

AMilliwatts

BWatts

CHundred of watts

DKilowatts

#204📘 reviewer_appEasy

Self-oscillation in a transistor amplifier is usually caused by

Aexcessive gain

Bstray inductance

Cinternal capacitance

Dunmatch impedances

#205📘 reviewer_appEasy

Neutralization is the process of

Acancelling the effect of internal device capacitance

Bbypassing undesired alternating current

Creducing gain

Deliminating harmonics

#206📘 reviewer_appEasy

Which of the ff is NOT a benefit of a toroid RF inductor?

ANo shielding required

BFewer truns of wire

CHigher Q

DSelf-supporting

#207📘 reviewer_appEasy

A toroid is a

AType of inductor

BTransformer

CMagnetic core

DCoil holder

#208📘 reviewer_appEasy

Which of the ff is NOT commonly used for impedance matching in a transmitter?

AResistive attenuator

BTransformer

CL network

DT network

#209📘 reviewer_appEasy

Impedance matching in a broadband linear RF amplifier is handled with a(n)

AL network

BParallel tuned circuit

CPi network

DBalun

#210📘 reviewer_appEasy

Which of the ff is NOT a benefit of speech-processing circuits?

AImproved frequency stability

BIncreased average output power

CLimited bandwidth

DPrevention of overmodulation

#211📘 reviewer_appEasy

In a speech-processing circuit, a low-pass filter prevents

AOverdeviation

BOvermodulation

CHigh gain

DExcessive signal bandwidth

#212📘 reviewer_appEasy

The gain of a transistor amplifier is

AInversely proportional to collector current

BDirectly proportional to frequency

CDirectly proportional to collector current

DInversely proportional to frequency

#213📘 reviewer_appEasy

The sensitivity of a receiver depends upon the reciever's overall

ABandwidth

BSelectivity

CNoise response

DGain

#214📘 reviewer_appEasy

The main cause of image interference is

APoor front-end selectivity

BLow gain

CA high IF

DA low S/N ratio

#215📘 reviewer_appEasy

Noise at the input to a receiver can be as high as several

AMicrovolts

BMillivolts

CVolts

DKilovolts

#216📘 reviewer_appEasy

Which filter shape factor represents the best skirt selectivity?

A1.6

B2.1

C5.3

D8

#217📘 reviewer_appEasy

Which input signal below represents the best sensitivity?

A0.5 µV

B1 µV

C1.8 µV

D2 µV

#218📘 reviewer_appMedium

The transistor with the lowest noise figure in the microwave region is a(n)

AMOSFET

BDual-gate MOSFET

CJFET

DMESFET

#219📘 reviewer_appEasy

The AGC circuits usually control the gain of the

AMixer

BDetector

CIF amplifiers

DAudio amplifiers

#220📘 reviewer_appEasy

Selectivity is obtained in most receivers from

ACrystal filters

BMechanical filters

CDouble-tuned circuits

DAudio filters

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