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Current chopping mainly occurs in
oil circuit breaker
air-blast circuit breaker
sf 6 circuit breaker
vaccum circuit breaker
oil circuit breaker
air-blast circuit breaker
sf 6 circuit breaker
vaccum circuit breaker
Answer
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For the protection of power station buildings against direct strokes the requirements are
interception, conduction and dissipation
interception
None of these
interception and conduction
interception, conduction, dissipation and reflection
interception, conduction and dissipation
interception
None of these
interception and conduction
interception, conduction, dissipation and reflection
Answer
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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
None of these
750 A
1500 A
1500/√3 A
None of these
750 A
1500 A
Answer
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When the circuit breaker operates under fault conditions, the greatest noise is produced in
oil circuit breaker
sf6 circuit breaker
air-blast circuit breaker
vaccum circuit breaker
oil circuit breaker
sf6 circuit breaker
air-blast circuit breaker
vaccum circuit breaker
Answer
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When a fault occur in a power system, the circuit breaker
None of these
is opened by remote control
is opened manually
opens automatically
None of these
is opened by remote control
is opened manually
opens automatically
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The fuse rating is expressed in terms of
kVA
voltage
current
VAR
kVA
voltage
current
VAR
Answer
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