Brushes of D.C. machines are made of_________?

Related Mcqs:

While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards___________?

A. direction of induced e.m.f. B. direction of flux C. direction of motion of the conductor if forefinger points in the direction of generated e.m.f. D. direction of motion of conductor, if forefinger points along the lines of flux...

The insulating material used between the commutator segments is normally_____________?

A. graphite B. paper C. mica D. insulating varnish...

The rapid wear of brushes takes place due to____________?

A. abrasion from dust B. excessive spring pressure C. rough commutator bars D. high mica insulation between com-mutation bars E. all of the above factors...

The armature core of a D.C. generator is usually made of__________________?

A. silicon steel B. copper C. non-ferrous material D. cast-iron...

The critical resistance of the D.C. generator is the resistance of_____________?

A. field B. brushes C. armature D. load...