What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?

Related Mcqs:

In a D.C. shunt motor, speed is______________?

A. independent of armature current B. directly proportional to the armature current C. proportional to the square of the current D. inversely proportional to the armature current...

Which of the following law/rule can he used to determine the direction of rotation of D.C. motor ?

A. Lenz’s law B. Faraday’s law C. Coloumb’s law D. Fleming’s left-hand rule...

The armature torque of the D.C. shunt motor is proportional to____________?

A. field flux only B. armature current only C. both A. and B. D. none of the above...

Why are the D.C. motors preferred for traction applications ?

A. Torque and speed are inversely proportional to armature current B. Torque is proportional to armature current C. Torque is proportional to square root of armature current D. The speed is inversely proportional to the torque and the torque is proportional to square of armature current...

Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control______________?

A. drum type controller is used B. three point starter is used C. four point starter is used D. all above can be used...