Electrical and Electronics : Practice Questions and Answers

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

Shunt generators are most suited for stable parallel operation because of their

If a self excited D.C. generator after being installed, fails to build up on its first trial run, the first thing to do is to

The demagnetising component of armature reaction in a D.C. generator

The armature of D.C. generator is laminated to

A D.C. generator can be considered as

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

Eddy currents are induced in the pole shoes of a D.C. machine due to