Sparking at the commutator of a D.C. motor may result in____________?

Related Mcqs:

A direct on line starter is used: for starting motors___________?

A. up to 5 H.P B. up to 10 H.P C. up to 15 H.P D. up to 20 H.P...

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

A. Frame B. Shaft C. Commutator D. Stator...

Which one of the following is not the function of pole shoes in a D.C. machine ?

A. To reduce eddy current loss B. To support the field coils C. To spread out flux for better uniformity D. To reduce the reluctance of the magnetic path...

Regenerative method of braking is based on that___________?

A. back e.m.f. is less than the applied voltage B. back e.m.f. is equal to the applied voltage C. back e.m.f. of rotor is more than the applied voltage D. none of the above...

A dc series motor should not be started on no load because it would___________?

A. not develop starting torque B. fail to start without load C. run at dangerously high speed D. draw more current without producing sufficient torque...