DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

Minimum line power losses
Low cost of HVDC terminals
Simple protection
No harmonic problems

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

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

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

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