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Industrial Drives

Study 70 Electrical Engineering MCQs with correct answers and explanations.

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1Electrical EngineeringMedium

The load cycle for a motor driving a power press will be________?

Acontinuous but periodical

Bvariable load

Ccontinuous

Dintermittent and variable load

Correct answer

D. intermittent and variable load

Explanation

The correct answer is intermittent and variable load.

2Electrical EngineeringMedium

The capacity of a crane is expressed in terms of________?

Aany of the above

Btonnes

Cspan

Dtype of drive

Correct answer

B. tonnes

Explanation

The correct answer is tonnes.

3Electrical EngineeringMedium

Which of the following alternatives will be cheaper?

AA 100 H.P. AC. three phase motor

BFour motors of 25 H.P. each

CTen motors of 10 H.P. each

DFive motors of 20 H.P. each

Correct answer

A. A 100 H.P. AC. three phase motor

Explanation

The correct answer is A 100 H.P. AC. three phase motor.

4Electrical EngineeringMedium

Which of the following motors are best for the rolling mills?

ASingle phase motors

BSlip ring induction motors

CD.C. motors

DSquirrel cage induction motors

Correct answer

C. D.C. motors

Explanation

The correct answer is D.C. motors.

5Electrical EngineeringMedium

In which of the following applications variable speed operation is preferred?

AExhaust fan

BRefrigerator

CCeiling fan

DWater pump

Correct answer

C. Ceiling fan

Explanation

The correct answer is Ceiling fan.

6Electrical EngineeringMedium

When the load is above ________ a synchronous motor is found to be more economical?

A50 kW

B20 kW

C2 kW

D100 kW

Correct answer

D. 100 kW

Explanation

The correct answer is 100 kW.

7Electrical EngineeringMedium

________has least range of speed control?

ASynchronous motor

BD.C. shunt motor

CSchrage motor

DSlip ring induction motor

Correct answer

A. Synchronous motor

Explanation

The correct answer is Synchronous motor.

8Electrical EngineeringMedium

In ________ method of staging three phase induction motors the starting voltage is not reduced?

Aauto-transformer

Bany of the above

Cstar-delta

Dslip ring

Correct answer

D. slip ring

Explanation

The correct answer is slip ring.

9Electrical EngineeringMedium

________ has relatively wider range of speed control?

AShip ring induction motor

BSquirrel cage induction motor

CD.C. shunt motor

DSynchronous motor

Correct answer

C. D.C. shunt motor

Explanation

The correct answer is D.C. shunt motor.

10Electrical EngineeringMedium

In case of ________ speed control by injecting e.m.f. in the rotor circuit is possible?

Aslip ring induction motor

Bschrage motor

Csynchronous motor

Dd.c. shunt motor

Correct answer

A. slip ring induction motor

Explanation

The correct answer is slip ring induction motor.

1Electrical EngineeringMedium

The load cycle for a motor driving a power press will be________?

Acontinuous but periodical

Bvariable load

Ccontinuous

Dintermittent and variable load

Correct answer

D. intermittent and variable load

Explanation

The correct answer is intermittent and variable load.

2Electrical EngineeringMedium

The capacity of a crane is expressed in terms of________?

Aany of the above

Btonnes

Cspan

Dtype of drive

Correct answer

B. tonnes

Explanation

The correct answer is tonnes.

3Electrical EngineeringMedium

Which of the following alternatives will be cheaper?

AA 100 H.P. AC. three phase motor

BFour motors of 25 H.P. each

CTen motors of 10 H.P. each

DFive motors of 20 H.P. each

Correct answer

A. A 100 H.P. AC. three phase motor

Explanation

The correct answer is A 100 H.P. AC. three phase motor.

4Electrical EngineeringMedium

Which of the following motors are best for the rolling mills?

ASingle phase motors

BSlip ring induction motors

CD.C. motors

DSquirrel cage induction motors

Correct answer

C. D.C. motors

Explanation

The correct answer is D.C. motors.

5Electrical EngineeringMedium

In which of the following applications variable speed operation is preferred?

AExhaust fan

BRefrigerator

CCeiling fan

DWater pump

Correct answer

C. Ceiling fan

Explanation

The correct answer is Ceiling fan.

6Electrical EngineeringMedium

When the load is above ________ a synchronous motor is found to be more economical?

A50 kW

B20 kW

C2 kW

D100 kW

Correct answer

D. 100 kW

Explanation

The correct answer is 100 kW.

7Electrical EngineeringMedium

________has least range of speed control?

ASynchronous motor

BD.C. shunt motor

CSchrage motor

DSlip ring induction motor

Correct answer

A. Synchronous motor

Explanation

The correct answer is Synchronous motor.

8Electrical EngineeringMedium

In ________ method of staging three phase induction motors the starting voltage is not reduced?

Aauto-transformer

Bany of the above

Cstar-delta

Dslip ring

Correct answer

D. slip ring

Explanation

The correct answer is slip ring.

9Electrical EngineeringMedium

________ has relatively wider range of speed control?

AShip ring induction motor

BSquirrel cage induction motor

CD.C. shunt motor

DSynchronous motor

Correct answer

C. D.C. shunt motor

Explanation

The correct answer is D.C. shunt motor.

10Electrical EngineeringMedium

In case of ________ speed control by injecting e.m.f. in the rotor circuit is possible?

Aslip ring induction motor

Bschrage motor

Csynchronous motor

Dd.c. shunt motor

Correct answer

A. slip ring induction motor

Explanation

The correct answer is slip ring induction motor.