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

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

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DGVCL Exam Paper (11-12-2011)
Distribution transformers have good all day efficiency due to

Low copper as well as iron loss
Low iron loss
Low voltage
Low copper loss

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DGVCL Exam Paper (11-12-2011)
DC series motors are best suited for traction work because

Torque and speed are proportional to the square of the armature current
Torque and speed are inversely proportional to the square of the armature current
Its torque is proportional to the square of the armature current and speed is inversely proportional to torque
Its torque is proportional to the square of the armature current and speed is directional proporational to torque

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