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The reflection co-efficient at the open circuited end of a transmission line

None of these
unity
zero
infinity

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

6.25 A
25 A
3.125 A
12.5 A

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The fusing factor is

None of these
always more than 1
always 1
always less than 1

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The fuse wire, in D.C. circuits, is inserted in

none of the listed here
Both of the listed here
positive circuit only
negative circuit only

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A fuse is never inserted in

positive of dc circuit
negative of dc circuit
phase line
neutral wire

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Resistance grounding is used for voltage between

None of these
11 kv to 33 kv
33 kV to 66 kV
3.3 kV to 11 kv

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