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

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

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DGVCL Exam Paper (11-12-2011)
The corona effect can be minimized by increasing

The length of the conductor
Spacing between the conductors
Both spacing between the conductors and diameter of the conductor
Diameter of the conductor

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DGVCL Exam Paper (11-12-2011)
Hysteresis in an instrument means

The repeatability of the instrument
The inaccuracy due to change in temperature
The change in the same reading when the input is first increased and then decreased
The reliability of the instrument

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