Study mode · no timer

Amplifiers with Negative Feedback

Study 18 Electrical Engineering MCQs with correct answers and explanations.

Answers and explanations are always visible Take this test

11Electrical EngineeringMedium

An emitter follower has ________input impedance?

AHigh

BZero

CNone of the above

DLow

Correct answer

A. High

Explanation

The correct answer is High.

12Electrical EngineeringMedium

If voltage feedback (negative) is applied to an amplifier, its output impedance ________?

AIs increased

BIs decreased

CNone of the above

DRemains the same

Correct answer

B. Is decreased

Explanation

The correct answer is Is decreased.

13Electrical EngineeringMedium

The gain of an amplifier without feedback is 100 dB. If a negative feedback of 3 dB is applied, the gain of the amplifier will become________?

A103 dB

B5 dB

C97 dB

D300 dB

Correct answer

C. 97 dB

Explanation

The correct answer is 97 dB.

14Electrical EngineeringMedium

When negative voltage feedback is applied to an amplifier, its voltage gain ________?

ARemains the same

BIs reduced

CNone of the above

DIs increased

Correct answer

B. Is reduced

Explanation

The correct answer is Is reduced.

15Electrical EngineeringMedium

When current feedback (negative) is applied to an amplifier, its input impedance ________?

ARemains the same

BIs increased

CIs decreased

DNone of the above

Correct answer

C. Is decreased

Explanation

The correct answer is Is decreased.

16Electrical EngineeringMedium

A feedback circuit usually employs ________ network?

AInductive

BResistive

CNone of the above

DCapacitive

Correct answer

B. Resistive

Explanation

The correct answer is Resistive.

17Electrical EngineeringMedium

The output impedance of an emitter follower is________?

AVery high

BAlmost zero

CHigh

DLow

Correct answer

D. Low

Explanation

The correct answer is Low.

18Electrical EngineeringMedium

The value of negative feedback fraction is always ________?

ALess than 1

BNone of the above

CEqual to 1

DMore than 1

Correct answer

A. Less than 1

Explanation

The correct answer is Less than 1.

11Electrical EngineeringMedium

An emitter follower has ________input impedance?

AHigh

BZero

CNone of the above

DLow

Correct answer

A. High

Explanation

The correct answer is High.

12Electrical EngineeringMedium

If voltage feedback (negative) is applied to an amplifier, its output impedance ________?

AIs increased

BIs decreased

CNone of the above

DRemains the same

Correct answer

B. Is decreased

Explanation

The correct answer is Is decreased.

13Electrical EngineeringMedium

The gain of an amplifier without feedback is 100 dB. If a negative feedback of 3 dB is applied, the gain of the amplifier will become________?

A103 dB

B5 dB

C97 dB

D300 dB

Correct answer

C. 97 dB

Explanation

The correct answer is 97 dB.

14Electrical EngineeringMedium

When negative voltage feedback is applied to an amplifier, its voltage gain ________?

ARemains the same

BIs reduced

CNone of the above

DIs increased

Correct answer

B. Is reduced

Explanation

The correct answer is Is reduced.

15Electrical EngineeringMedium

When current feedback (negative) is applied to an amplifier, its input impedance ________?

ARemains the same

BIs increased

CIs decreased

DNone of the above

Correct answer

C. Is decreased

Explanation

The correct answer is Is decreased.

16Electrical EngineeringMedium

A feedback circuit usually employs ________ network?

AInductive

BResistive

CNone of the above

DCapacitive

Correct answer

B. Resistive

Explanation

The correct answer is Resistive.

17Electrical EngineeringMedium

The output impedance of an emitter follower is________?

AVery high

BAlmost zero

CHigh

DLow

Correct answer

D. Low

Explanation

The correct answer is Low.

18Electrical EngineeringMedium

The value of negative feedback fraction is always ________?

ALess than 1

BNone of the above

CEqual to 1

DMore than 1

Correct answer

A. Less than 1

Explanation

The correct answer is Less than 1.