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

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

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Its torque is proportional to the square of the armature current and speed is inversely proportional to torque
Its torque is proportional to the square of the armature current and speed is directional proporational to torque
Torque and speed are inversely proportional to the square of the armature current
Torque and speed are proportional to the square of the armature current

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DGVCL Exam Paper (11-12-2011)
The advantage of slipring induction motor over the squirrel cage induction motor is

It's power factor is higher
It has a higher efficiency
It is suitable for higher speeds
It can be started with the help of rotor resistances

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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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