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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