DC Generator in Electrical and Electronics : Practice MCQ Questions & Answers with Explanations

The number of brushes in a commutator depends on

Two D.C. shunt generators, each with armature resistance of 0.02 ohm and fieldresistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the loadcircuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be

Iron losses in a D.C. machine are independent of variations in

For both lap and wave windings, there are as many commutator bars as the number of

In D.C. generators on no-load, the air gap flux distribution in space is

Which of the following generators will be preferred if they are required to be run inparallel ?

In D.C. generators, the cause of rapid brush wear may be

Which generator would you prefer for feeding long D.C. transmission lines ?

Which of the following D.C. generators will be in a position to build up without anyresidual magnetism in the poles ?

Which of the following generator will have negligible terminal voltage while running onno-load ?

D.C. generator generally preferred for charging automobile batteries is

Following D.C. generator will be in a position to build up without any residualmagnetism in the poles

Following energized winding of a D.C. machine should not be opened as it wouldproduce high inductive voltage which may be dangerous to personnel and may cause itsown insulation failure.

An exciter for a turbo generator is a

Which of the following generating machine will offer constant voltage on all loads ?

The essential condition for parallel operation of two D.C. generators is that they have

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

In any rotating machine that part which houses the conductors and in which e.m.f.induced is to be utilised is called

In D.C. generators the pole shoes are fastened to the pole core by