DC Motors - Interview Questions | Exam2Win

Take a timed mock test specifically for DC Motors.

6. When two D.C. series motors are connected in parallel, the resultant speed is

A. more than the normal speed

B. loss than the normal speed

C. normal speed

D. zero

Explanation: ANSWER : : normal speed Explanation :

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

A. Series motor

B. Shunt motor

C. Differentially compound motor

D. Cumulative compound motor

Explanation: ANSWER : : Series motor Explanation :

8. Starters are used with D.C. motors because

A. these motors have high starting torque

B. these motors are not self-starting

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

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

Explanation: ANSWER : : to restrict armature current as there is no back e.m.f. while starting Explanation :

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

A. Series motor

B. Shunt motor

C. Cumulative compound motor

D. Differential compound motor

Explanation: ANSWER : : Shunt motor Explanation :

10. The direction of rotation of a D.C. series motor can be changed by

A. interchanging supply terminals

B. interchanging field terminals

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

D. None of the above

Explanation: ANSWER : : interchanging field terminals Explanation :