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
Uniform current flows through the conductor
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

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

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 directional proporational 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 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 reduce the locking tendency of the rotor
To increase the distributuion factor

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