DGVCL Exam Paper (11-12-2011)
The form factor in AC means the ration of

Peak value to average value
R.M.S. value to peak value
Peak value to r.m.s value
R.M.S. value to average value

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DGVCL Exam Paper (11-12-2011)
The corona effect can be minimized by increasing

The length of the conductor
Both spacing between the conductors and diameter of the conductor
Spacing between the conductors
Diameter of the conductor

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

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

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