A series generator can self-excite:______________?

Related Mcqs:

Copper brushes in D.C. machine are used_____________?

A. where low voltage and high currents are involved B. where high voltage and small cur-rents are involved C. in both of the above cases D. in none of the above cases...

In D.C. generators, current to the external circuit from armature is given through_____________?

A. commutator B. solid connection C. slip rings D. none of above...

In a D.C. machine stray loss is the sum of_____________?

A. total copper loss and mechanical loss B. armature copper loss and iron loss C. shunt field copper loss and mechanical loss D. iron loss and mechanical loss...

Satisfactory commutation of D.C. machines requires______________?

A. brushes should be of proper grade and size B. brushes should smoothly run in the holders C. smooth, concentric commutator properly undercut D. all of the above...

If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?

A. zero B. small C. the same as rated voltage D. high...