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Switch Gear

Switch Gear
The time of closing the cycle, in modern circuit breakers is

0.01 sec
0.10 sec
0.003 sec
0.001 sec

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Switch Gear
series reactors should have

high impedance
low resistance
low impedance
high resistance

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Switch Gear
The rated secondary current of current transformer for relays is generally

5 A
20 A
30 A
10 A

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

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

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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
________ relay is preferred for phase fault on short transmission line.

Impedance
Induction type
Reactance
None of these

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