DGVCL Exam Paper (11-12-2011)
If the excitation of a synchronous generator fails, it acts as a

Induction motor
Induction generator
Synchronous motor
Synchronous generator

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

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

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Portion of the conductor near the surface carries less current and the core of the conductor carries more current
Current flows through the half cross section of the conductor
Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Uniform current flows through the conductor

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