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Switch Gear

Switch Gear
Distance relays are generally

reactance relays
none of these
impedance relays
split-phase relays

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Switch Gear
The operating time of a fuse is about

1 sec
0.8 sec
1.5 sec
0.002 sec

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Switch Gear
Arc in a circuit breaker is interrupted at

zero current
maximum current
minimum voltage
maximum voltage

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Switch Gear
Interruption of large currents by relay requires

high speed opening of contacts
wide separation of the opened contacts
all of these
arc suppressing blow out coils

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Switch Gear
Most of the relays on service on electric power system are

thermal relays
electro-mechanical relays
electronic relays
None of these

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Switch Gear
The fuse wire, in DC circuit, is inserted in

None of these
Both positive and negative circuit
positive circuit only
negative circuit only

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