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Switch Gear

Switch Gear
In Railway applications ______ circuit breaker is used.

bulk oil
SFe
minimum oil
air break

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Switch Gear
For which of the following protection from negative sequence currents is provided ?

Transmission line
Generators
Motors
Transformers

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Switch Gear
If the fault occurs near the impedance relay, the V/ I ratio will be

None of these
constant for all distances
Lower than that of if fault occurs away from the relay
higher than that of if fault occurs away from the relay

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Switch Gear
Interruption of large currents by relay requires

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

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Switch Gear
The device that detects the fault in a power system is

circuit breaker
relay
None of these
isolator

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Switch Gear
The short circuit in any winding of the transformer is the result of

insulation failure
mechanical vibration
impulse voltage
loose connection

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