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

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

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

The inaccuracy due to change in temperature
The change in the same reading when the input is first increased and then decreased
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 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 purpose of interpoles in DC machines is to nullify

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

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Portion of the conductor near the surface carries less current and the core of the conductor carries more current
Current flows through the half cross section of the conductor
Uniform current flows through the conductor

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