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

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

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DGVCL Exam Paper (11-12-2011)
The purpose of skewing of rotor slots in an induction motor is

To reduce the magnetic hum of the motor
To increase the breadth factor
To increase the distributuion factor
To reduce the locking tendency of the rotor

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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 cross-magnetizing effect of armature mmf
The reactance voltage
The demagnetizing effect of armature mmf

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