DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

Trapping power frequency waves
Tripping fault current
All of these
Trapping high frequency waves entering into generator/transformer unit.

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DGVCL Exam Paper (11-12-2011)
The purpose of interpoles in DC machines is to nullify

The reactance voltage
Both the cross-magnetizing mmf and the reactance voltage
The demagnetizing effect of armature mmf
The cross-magnetizing effect of armature mmf

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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

Harmonics in the generated emf
Amount of copper in the winding
Size of the machine
Cost of the machine

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