Electrical Engineering · all questions

D.C. Generators
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125

Questions

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Q101

Laminations of core are generally made of

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Q102

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

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Q103

A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave

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Q104

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

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Q105

Which of the following could be lamina proximately the thickness of laminations of a D.C. machine?

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Q106

The rapid wear of brushes takes place due to

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Q107

In case of D.C. machine winding, number of commutator segments is equal to

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Q108

The insulating material used between the commutator segments is normally

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Q109

The bearings used to support the rotor shafts are generally

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Q110

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

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Q111

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

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Q112

In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except

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Q113

The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage

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Q114

While applying Fleming's right-hand rule to and the direction of induced e.m.f., the thumb points towards

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Q115

In a D.C. generator the critical resistance refers to the resistance of

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Q116

As a result of armature reaction, the reduction in the total mutual air gap flux in a D.C. generator is approximately

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Q117

An exciter for a turbo generator is a

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Q118

In D.C. generators the polarity of the interpoles

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Q119

Inter-pole flux should be sufficient to

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Q120

The number of armature parallel paths in a two-pole D.C. generator having duplex lap winding is

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