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 copper loss
Low voltage

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DGVCL Exam Paper (11-12-2011)
The advantage of slipring induction motor over the squirrel cage induction motor is

It can be started with the help of rotor resistances
It's power factor is higher
It has a higher efficiency
It is suitable for higher speeds

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