DGVCL Exam Paper (11-12-2011)
First zone distance relay protects the transmission line section upto

50 % of its full length
Its full length
80 % of its full length
25 % of its full length

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

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

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

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