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

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

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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)
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 increase the breadth factor
To reduce the magnetic hum of the motor

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DGVCL Exam Paper (11-12-2011)
The motor used in celling fans is

Split phase motor
Capacitor start capacitor run motor
Capacitor start motor
Universal motor

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