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

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

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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)
The purpose of skewing of rotor slots in an induction motor is

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

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