DGVCL Exam Paper (11-12-2011)
The transient stability of a power system can be improved by

Phase shifting transformer
Excitation control
Single pole switching of circuit breakers
Increasing the turbine valve opening

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

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

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

The reliability of the instrument
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

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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 copper loss
Low iron loss

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