DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for both major and minor faults
Tripping for minor faults and alarm for major faults
Tripping for major faults and alarm for minor faults
Alarm for both major and minor faults

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

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

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DGVCL Exam Paper (11-12-2011)
Due to skin effect

Portion of the conductor near the surface carries less current and the core of the conductor carries more current
Portion of the conductor near the surface carries more current and the core of the conductor carries less current
Uniform current flows through the conductor
Current flows through the half cross section of the conductor

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