DGVCL Exam Paper (11-12-2011)
The purpose of embedding the damper winding in the pole face of a synchronous motor is to

Eliminate losses on account of fair friction
Eliminate hunting and provide adequate starting torque
Reduce winding losses
Reduce bearing friction

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DGVCL Exam Paper (11-12-2011)
Two parallel conductors are carrying the current in the same direction. Which of the following statements is correct?

There is an attracting force between the conductors
The force increases when the distance between the conductors is increased
The force increases when the distance between the conductors is decreased
There is a repelling force between the conductors

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DGVCL Exam Paper (11-12-2011)
An IDMT relay provides

An inverse time current characteristic
A definite time cuttent characteristic
A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current
An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current

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

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

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