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

80 kA
60 kA
20 kA
35 kA

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Air blast circuit breaker is used for

intermittent duty
over currents
short duty
repeated duty

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The main function of a fuse is to

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

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Admittance relay is

directional relay
impedance relay
None of these
non-directional relay

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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is

1500/√3 A
1500 A
750 A
None of these

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Interruption of large currents by relay requires

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

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