DC Motor MCQ

Solve MCQ of DC motor ,here given lots of unique mcq for you.It can be very help full for your electrical engineering exam or competitive exams.

DC Motor MCQ

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

A. Shunt motor

B. Series motor

C. Cumulative compound motor

D. Differentiate compound motor

2. D.C. series motor direction of rotation of changed by

A. interchanging supply terminals

B. interchanging field terminals

C. either of (a) and (b) above

D. None of the above

3. Which application requires high starting torque?

A. Lathe machine

B. Centrifugal pump

C. Locomotive

D. Air blower

4. If DC motor is to be picked for conveyors, which rotor would be liked?

A. Series motor

B. Shunt motor

C. Differentially compound motor

D. Cumulative compound motor

5. Which D.C. motor is preferred for machine tools?

A. Series motor

B. Shunt motor

C. Cumulative compound motor

D. Differential compound motor

6. Differentially compound D.C. motor can find application which requires

A. high starting torque

B. low starting torque

C. variable speed

D. frequent on-off cycles

7. Which D.C. motor is favored for lifts?

A. Shunt motor

B. Series motor

C. Differential compound motor

D. Cumulative compound motor

8. As per Fleming’s left-hand rule, when the forefinger points in the direction of the field or flux, the middle finger will point towards

A. current in the conductor

B. aovtaat of conductor

C. resultant force on a conductor

D. none of the above

9. If the field of D.C. shunt machine getting opened, while motor is running at

A. speed of motor will be reduced %

B. armature current will reduce

C. motor will attain dangerously high speed

D. motor will continue to nuvat constant speed

10. Why are starters used with D.C. motors?

A. motors have high starting torque

B. motors aren`t self-start

C.initially back e.m.f. of these motors is zero

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

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