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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
The transient voltage that appears across the contacts at the instant of arc extinction is called

recovery voltage
restriking voltage
supply voltage
peak voltage

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Switch Gear
The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

6
2
4
8

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

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

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Switch Gear
series reactors should have

high resistance
low resistance
low impedance
high impedance

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Switch Gear
Which of the following is the least expensive protection for over current is low voltage system ?

air break circuit breaker
rewireable fuse
oil circuit breaker
isolator

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MORE MCQ ON Switch Gear

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