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Current chopping mainly occurs in

sf 6 circuit breaker
vaccum circuit breaker
oil circuit breaker
air-blast circuit breaker

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If the length of the arc in a circuit breaker increases, its resistance

remains same
increases
decreases
None of these

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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

None of these
1500/√3 A
1500 A
750 A

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A circuit breaker must perform the duty of

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

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Most of the relays on service on electric power system are

thermal relays
electro-mechanical relays
None of these
electronic relays

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