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Switch Gear

Switch Gear
Admittance relay is

None of these
impedance relay
non-directional relay
directional relay

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Switch Gear
A circuit breaker must perform the duty of

being closed on to a fault
carrying fault current for a short time
opening the faulty circuit and breaking the fault current
All of these

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Switch Gear
Air blast circuit breakers for 400 kV power system are designed to operate in

0.5 sec
50 milli-second
100 micro-second
0.1 sec

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Switch Gear
In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as

lag time
operation time
clearing time
lead time

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Switch Gear
Resistance grounding is used for voltage between

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

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Switch Gear
Interruption of large currents by relay requires

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

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