Study mode · no timer

All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

Answers and explanations are always visible Take this quiz

3531Electrical EngineeringMedium

The shaded pole motor is used for________?

Alow starting torque

Bvery high starting torque

Chigh starting torque

Dmedium starting torque

Correct answer

A. low starting torque

Explanation

The correct answer is low starting torque.

3532Electrical EngineeringMedium

If the field of a synchronous motor is underexcited, the power factor will be________?

Aleading

Blagging

Czero

Dunity

Correct answer

B. lagging

Explanation

The correct answer is lagging.

3533Electrical EngineeringMedium

The input offset current equals the________?

Anone of these

Baverage of two base currents

Ccollector current divided by current gain

Ddifference between two base currents

Correct answer

D. difference between two base currents

Explanation

The correct answer is difference between two base currents.

3534Electrical EngineeringMedium

An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be________?

A6000 A.

B2121.32 A.

C1500 A.

D4242.64 A.

Correct answer

B. 2121.32 A.

Explanation

The correct answer is 2121.32 A..

3535Electrical EngineeringMedium

In thermocouples which of the following pairs is commonly used?

ASilver-German silver

BAluminium-tin

CCopper-constantan

DIron-steel

Correct answer

C. Copper-constantan

Explanation

The correct answer is Copper-constantan.

3536Electrical EngineeringMedium

In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance?

A25 O

B10 O

C40 O

D50 O

Correct answer

D. 50 O

Explanation

The correct answer is 50 O.

3537Electrical EngineeringMedium

Automatic signalling is used for which of the following trains?

AAll trains

BSuperfast trains

CSuburban and Urban electric trains

DMail and express trains

Correct answer

B. Superfast trains

Explanation

The correct answer is Superfast trains.

3538Electrical EngineeringMedium

Which of the following application requires high starting torque?

ALathe machine

BLocomotive

CAir blower

DCentrifugal pump

Correct answer

B. Locomotive

Explanation

The correct answer is Locomotive.

3539Electrical EngineeringMedium

For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?

A10 W

BNone of the above

C4 W

D8 W

Correct answer

C. 4 W

Explanation

The correct answer is 4 W.

3540Electrical EngineeringMedium

If the coil is wound on an iron core the flux through it will________?

Aremain the same

Bbecome zero

Cincrease

Ddecrease

Correct answer

C. increase

Explanation

The correct answer is increase.

3531Electrical EngineeringMedium

The shaded pole motor is used for________?

Alow starting torque

Bvery high starting torque

Chigh starting torque

Dmedium starting torque

Correct answer

A. low starting torque

Explanation

The correct answer is low starting torque.

3532Electrical EngineeringMedium

If the field of a synchronous motor is underexcited, the power factor will be________?

Aleading

Blagging

Czero

Dunity

Correct answer

B. lagging

Explanation

The correct answer is lagging.

3533Electrical EngineeringMedium

The input offset current equals the________?

Anone of these

Baverage of two base currents

Ccollector current divided by current gain

Ddifference between two base currents

Correct answer

D. difference between two base currents

Explanation

The correct answer is difference between two base currents.

3534Electrical EngineeringMedium

An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be________?

A6000 A.

B2121.32 A.

C1500 A.

D4242.64 A.

Correct answer

B. 2121.32 A.

Explanation

The correct answer is 2121.32 A..

3535Electrical EngineeringMedium

In thermocouples which of the following pairs is commonly used?

ASilver-German silver

BAluminium-tin

CCopper-constantan

DIron-steel

Correct answer

C. Copper-constantan

Explanation

The correct answer is Copper-constantan.

3536Electrical EngineeringMedium

In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance?

A25 O

B10 O

C40 O

D50 O

Correct answer

D. 50 O

Explanation

The correct answer is 50 O.

3537Electrical EngineeringMedium

Automatic signalling is used for which of the following trains?

AAll trains

BSuperfast trains

CSuburban and Urban electric trains

DMail and express trains

Correct answer

B. Superfast trains

Explanation

The correct answer is Superfast trains.

3538Electrical EngineeringMedium

Which of the following application requires high starting torque?

ALathe machine

BLocomotive

CAir blower

DCentrifugal pump

Correct answer

B. Locomotive

Explanation

The correct answer is Locomotive.

3539Electrical EngineeringMedium

For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?

A10 W

BNone of the above

C4 W

D8 W

Correct answer

C. 4 W

Explanation

The correct answer is 4 W.

3540Electrical EngineeringMedium

If the coil is wound on an iron core the flux through it will________?

Aremain the same

Bbecome zero

Cincrease

Ddecrease

Correct answer

C. increase

Explanation

The correct answer is increase.