D.C. Motors Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on “Study of D.C. Motors Mcqs”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate D.C. Motors Mcqs comprehensively.

1. Kingdom Protoctista includes_______________?

Prokaryotic organisms

Unicellular organisms

Fungi

Eu-cariotiquic organisms

20 nm

200 nm

250 nm

300 nm

3. No-load speed of which of the following motor will be highest ?

Shunt motor

Series motor

Cumulative compound motor

Differentiate compound motor

4. The direction of rotation of a D.C. series motor can be changed by___________?

Interchanging supply terminals

Interchanging field terminals

Either of A. and B. above

None of the above

Lathe machine

Centrifugal pump

Locomotive

Air blower

6. If a D.C. motor is to be selected for conveyors, which rriotor would be preferred ?

Series motor

Shunt motor

Differentially compound motor

Cumulative compound motor

7. Which D.C. motor will be preferred for machine tools ?

Series motor

Shunt motor

Cumulative compound motor

Differential compound motor

8. Differentially compound D.C. motors can find applications requiring___________?

High starting torque

Low starting torque

Variable speed

Frequent on-off cycles

9. Which D.C. motor is preferred for elevators ?

Shunt motor

Series motor

Differential compound motor

Cumulative compound motor

10. According to Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point in the direction of_________________?

Current in the conductor aovtaat of conductor

Resultant force on conductor

None of the above

None of the above

11. If the field of a D.C. shunt motor gets opened while motor is running______________?

The speed of motor will be reduced %

The armature current will reduce

The motor will attain dangerously high speed 1

The motor will continue to nuvat constant speed

12. Starters are used with D.C. motors because______________?

These motors have high starting torque

These motors are not self-starting

Back e.m.f. of these motors is zero initially

To restrict armature current as there is no back e.m.f. while starting

13. In D.C. shunt motors as load is reduced__________________?

The speed will increase abruptly

The speed will increase in proportion to reduction in load

The speed will remain almost/constant

The speed will reduce

14. A D.C. series motor is that which______________?

Has its field winding consisting of thick wire and less turns

Has a poor torque

Can be started easily without load

Has almost constant speed

15. For starting a D.C. motor a starter is required because___________?

It limits the speed of the motor

It limits the starting current to a safe value

It starts the motor

None of the above

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