The rapid wear of brushes takes place due to____________?

Related Mcqs:

In case of D.C. machines, mechanical losses are primary function of____________?

A. current B. voltage C. speed D. none of above...

In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________________?

A. 4 B. 8 C. 16 D. 32...

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?

A. 640 V B. 620 V C. 600 V D. 580 V...

Lap winding is composed of_____________?

A. any even number of conductors B. any odd number of conductors C. that even number which is exact multiple of poles + 2 D. that even number which is exact multiple of poles...

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...