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The device that detects the fault in a power system is

None of these
circuit breaker
relay
isolator

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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is

20 kA
35 kA
60 kA
80 kA

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series reactors should have

high impedance
low impedance
high resistance
low resistance

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With which of the following, a circuit breaker must be equipped for remote operation ?

None of these
shunt trip
inverse time trip
time-delay trip

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Air blast circuit breaker is used for

short duty
over currents
intermittent duty
repeated duty

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The main function of a fuse is to

protect the appliance
open the circuit
None of these
protect the line
prevent excessive currents

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