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An efficient and a well designed protective relaying should have
All of these
high speed and selectivity
economy and simplicity
good selectivity and reliability
All of these
high speed and selectivity
economy and simplicity
good selectivity and reliability
Answer
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When a fault occur in a power system, the circuit breaker
is opened by remote control
opens automatically
None of these
is opened manually
is opened by remote control
opens automatically
None of these
is opened manually
Answer
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A fuse should have
low melting point
low cost
high conductivity
All of these
low melting point
low cost
high conductivity
All of these
Answer
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The time-current graph of a fuse
has inverse characteristic
is a circle
None of these
has a linear characteristic
has inverse characteristic
is a circle
None of these
has a linear characteristic
Answer
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The making capacity of a circuit breaker is equal to
√3 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
None of these
√3 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
None of these
Answer
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For the protection of power station buildings against direct strokes the requirements are
interception and conduction
interception
None of these
interception, conduction and dissipation
interception, conduction, dissipation and reflection
interception and conduction
interception
None of these
interception, conduction and dissipation
interception, conduction, dissipation and reflection
Answer
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