D.C. Motors

6. Differentially compound D.C. motors can find applications requiring

Ans: low starting torque

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

Ans: Cumulative compound motor

8. 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

Ans: current in the conductor aovtaat of conductor

9. If the field of a D.C. shunt motor gets opened while motor is running

Ans: the motor will attain dangerously high speed 1    

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

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



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D.C. Motors

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

Ans: Series motor

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

Ans: interchanging field terminals

3. Which of the following application requires high starting torque ?

Ans: Locomotive

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

Ans: Series motor

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

Ans: Shunt motor

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Junior engineer syllabus for Electrical

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