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An isolator is designed to open a circuit under
full load
no load
normal conditions
None of these
full load
no load
normal conditions
None of these
Answer
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A fuse should have
All of these
high conductivity
low cost
low melting point
All of these
high conductivity
low cost
low melting point
Answer
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For the same power, the least size is of
air-blast circuit breaker
oil circuit breaker
sf6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker
oil circuit breaker
sf6 circuit breaker
vaccum circuit breaker
Answer
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The rating of a circuit breaker is generally determined on the basis of
line to line fault current
symmetrical fault current
double line to ground fault current
single line to ground fault current
line to line fault current
symmetrical fault current
double line to ground fault current
single line to ground fault current
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
None of these
1500/√3 A
750 A
1500 A
None of these
1500/√3 A
750 A
1500 A
Answer
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Interruption of large currents by relay requires
all of these
wide separation of the opened contacts
high speed opening of contacts
arc suppressing blow out coils
all of these
wide separation of the opened contacts
high speed opening of contacts
arc suppressing blow out coils
Answer
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