DGVCL Exam Paper (11-12-2011)
The purpose of providing a choke in a tube light is

To avoid radio interference
To eliminate corona effect
To limit the current to an appropriate value
To improve the power factor

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

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

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