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

Related Mcqs:

The commutator segments are connected to the armature conductors by means of___________?

A. copper lugs B. resistance wires C. insulation pads D. brazing...

The material for commutator brushes is generally_______________?

A. mica B. copper C. cast iron D. carbon...

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...

In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when____________?

A. r.p.m. is more than 300 B. r.p.m. is less than 300 C. number of poles is 4 D. number of poles is 2...

The main factor which leads to unstable parallel operation of flat and over compounded generators is_____________?

A. their rising voltage characteristics B. unequal number of turns in their series field windings C. unequal speed regulation of their primemovers D. unequal series field resistances...