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

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

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

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

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DGVCL Exam Paper (11-12-2011)
A fuse wire should have

Low specific resistance and low melting point
Low specific resistance and high melting point
High specific resistance and high melting point
High specific resistance and low melting point

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DGVCL Exam Paper (11-12-2011)
Hysteresis in an instrument means

The change in the same reading when the input is first increased and then decreased
The reliability of the instrument
The inaccuracy due to change in temperature
The repeatability of the instrument

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

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