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Switch Gear

Switch Gear
Outdoor switchgear is generally used for voltage beyond

132 kV
66 kV
33 kV
11 kV

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Switch Gear
Overheating of relay contacts or contact born out is due to

slow making and breaking of load circuit contacts
too low contact pressure
all of these
foreign matter on the contact surface

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Switch Gear
The making capacity of a circuit breaker is equal to

√2 × symmetrical breaking capacity
None of these
2.55 × symmetrical breaking capacity
√3 × symmetrical breaking capacity

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Switch Gear
The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to

insulate the contacts from switch body
None of these
extinguish the arc
All of these
lubricate the contacts

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Switch Gear
Insulation resistance of high voltage circuit breakers is more than

1 mega ohms
500 mega ohms
100 mega ohms
10 mega ohms

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

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

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