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Control Systems

Study 100 Electrical Engineering MCQs with correct answers and explanations.

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1Electrical EngineeringMedium

________is a closed loop system?

ADirect current generator

BElectric switch

CCar starter

DAuto-pilot for an aircraft

Correct answer

D. Auto-pilot for an aircraft

Explanation

The correct answer is Auto-pilot for an aircraft.

2Electrical EngineeringMedium

signal will become zero when the feedback signal and reference signs are equal?

AReference

BFeedback

CActuating

DInput

Correct answer

C. Actuating

Explanation

The correct answer is Actuating.

3Electrical EngineeringMedium

Due to which of the following reasons excessive bond width in control systems should be avoided?

AIt leads to slow speed of response

BNoise is proportional to band width

CIt leads to low relative stability

DNone of the above

Correct answer

B. Noise is proportional to band width

Explanation

The correct answer is Noise is proportional to band width.

4Electrical EngineeringMedium

The temperature, under thermal and electrical system analogy, is considered analogous to________?

Anone of the above

Bcharge

Ccurrent

Dcapacitance

Evoltage

Correct answer

E. voltage

Explanation

The correct answer is voltage.

5Electrical EngineeringMedium

Which of the following is the output of a thermocouple?

AAlternating current

BNone of the above

CD.C. voltage

DDirect current

EA.C. voltage

Correct answer

C. D.C. voltage

Explanation

The correct answer is D.C. voltage.

6Electrical EngineeringMedium

As a result of introduction of negative feedback which of the following will not decrease?

AOverall gain

BDistortion

CInstability

DBand width

Correct answer

D. Band width

Explanation

The correct answer is Band width.

7Electrical EngineeringMedium

A.C. servomotor is basically a________?

Asingle phase induction motor

Buniversal motor

Ctwo phase induction motor

Dthree phase induction motor

Correct answer

C. two phase induction motor

Explanation

The correct answer is two phase induction motor.

8Electrical EngineeringMedium

Which of the following devices is used for conversion of co-ordinates?

ASynchro-resolver

BSynchro-transformer

CMicrosyn

DSelsyn

Correct answer

A. Synchro-resolver

Explanation

The correct answer is Synchro-resolver.

9Electrical EngineeringMedium

A conditionally stable system exhibits poor stability at________?

Aincreased values of open loop gain

Bnone of the above

Clow frequencies

Dreduced values of open loop gain

Correct answer

D. reduced values of open loop gain

Explanation

The correct answer is reduced values of open loop gain.

10Electrical EngineeringMedium

If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is________?

Aany of the above

Bunstable

Calways unstable

Dstable

Enot necessarily stable

Correct answer

E. not necessarily stable

Explanation

The correct answer is not necessarily stable.

1Electrical EngineeringMedium

________is a closed loop system?

ADirect current generator

BElectric switch

CCar starter

DAuto-pilot for an aircraft

Correct answer

D. Auto-pilot for an aircraft

Explanation

The correct answer is Auto-pilot for an aircraft.

2Electrical EngineeringMedium

signal will become zero when the feedback signal and reference signs are equal?

AReference

BFeedback

CActuating

DInput

Correct answer

C. Actuating

Explanation

The correct answer is Actuating.

3Electrical EngineeringMedium

Due to which of the following reasons excessive bond width in control systems should be avoided?

AIt leads to slow speed of response

BNoise is proportional to band width

CIt leads to low relative stability

DNone of the above

Correct answer

B. Noise is proportional to band width

Explanation

The correct answer is Noise is proportional to band width.

4Electrical EngineeringMedium

The temperature, under thermal and electrical system analogy, is considered analogous to________?

Anone of the above

Bcharge

Ccurrent

Dcapacitance

Evoltage

Correct answer

E. voltage

Explanation

The correct answer is voltage.

5Electrical EngineeringMedium

Which of the following is the output of a thermocouple?

AAlternating current

BNone of the above

CD.C. voltage

DDirect current

EA.C. voltage

Correct answer

C. D.C. voltage

Explanation

The correct answer is D.C. voltage.

6Electrical EngineeringMedium

As a result of introduction of negative feedback which of the following will not decrease?

AOverall gain

BDistortion

CInstability

DBand width

Correct answer

D. Band width

Explanation

The correct answer is Band width.

7Electrical EngineeringMedium

A.C. servomotor is basically a________?

Asingle phase induction motor

Buniversal motor

Ctwo phase induction motor

Dthree phase induction motor

Correct answer

C. two phase induction motor

Explanation

The correct answer is two phase induction motor.

8Electrical EngineeringMedium

Which of the following devices is used for conversion of co-ordinates?

ASynchro-resolver

BSynchro-transformer

CMicrosyn

DSelsyn

Correct answer

A. Synchro-resolver

Explanation

The correct answer is Synchro-resolver.

9Electrical EngineeringMedium

A conditionally stable system exhibits poor stability at________?

Aincreased values of open loop gain

Bnone of the above

Clow frequencies

Dreduced values of open loop gain

Correct answer

D. reduced values of open loop gain

Explanation

The correct answer is reduced values of open loop gain.

10Electrical EngineeringMedium

If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is________?

Aany of the above

Bunstable

Calways unstable

Dstable

Enot necessarily stable

Correct answer

E. not necessarily stable

Explanation

The correct answer is not necessarily stable.