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
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

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

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

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

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