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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DGVCL Exam Paper (11-12-2011)
The main advantage of using fractional pitch winding is to refuce

Cost of the machine
Size of the machine
Harmonics in the generated emf
Amount of copper in the winding

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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 inaccuracy due to change in temperature
The reliability of the instrument
The repeatability of the instrument

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

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