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A circuit breaker is a
None of these
current limiting device
current controlling device
circuit interrupting device
None of these
current limiting device
current controlling device
circuit interrupting device
Answer
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For which of the following protection from negative sequence currents is provided ?
Transmission line
Transformers
Generators
Motors
Transmission line
Transformers
Generators
Motors
Answer
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The main function of a fuse is to
protect the appliance
prevent excessive currents
protect the line
open the circuit
None of these
protect the appliance
prevent excessive currents
protect the line
open the circuit
None of these
Answer
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Directional relay are based on flow of
power
current
All of these
voltage wave
power
current
All of these
voltage wave
Answer
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Circuit breakers usually operate under
steady state of short circuit current
after dc component has ceased
transient state of short circuit current
sub-transient state of short circuit current
steady state of short circuit current
after dc component has ceased
transient state of short circuit current
sub-transient state of short circuit current
Answer
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For the protection of power station buildings against direct strokes the requirements are
None of these
interception, conduction and dissipation
interception
interception, conduction, dissipation and reflection
interception and conduction
None of these
interception, conduction and dissipation
interception
interception, conduction, dissipation and reflection
interception and conduction
Answer
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