DGVCL Exam Paper (11-12-2011)
An over excited synchronous motor draws current at

Unity power factor
Depends on nature of load
Lagging power factor
Leading power factor

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DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for major faults and alarm for minor faults
Tripping for both major and minor faults
Alarm for both major and minor faults
Tripping for minor faults and alarm for major faults

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

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

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

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

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