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Air blast circuit breakers for 400 kV power system are designed to operate in
50 milli-second
0.1 sec
100 micro-second
0.5 sec
50 milli-second
0.1 sec
100 micro-second
0.5 sec
Answer
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A short-circuit is identified by
voltage drop
voltage rise
heavy current flow
no current flow
voltage drop
voltage rise
heavy current flow
no current flow
Answer
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Directional relay are based on flow of
power
All of these
voltage wave
current
power
All of these
voltage wave
current
Answer
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If the fault occurs near the impedance relay, the V/ I ratio will be
None of these
constant for all distances
Lower than that of if fault occurs away from the relay
higher than that of if fault occurs away from the relay
None of these
constant for all distances
Lower than that of if fault occurs away from the relay
higher than that of if fault occurs away from the relay
Answer
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Most of the relays on service on electric power system are
thermal relays
None of these
electronic relays
electro-mechanical relays
thermal relays
None of these
electronic relays
electro-mechanical relays
Answer
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An efficient and a well designed protective relaying should have
good selectivity and reliability
economy and simplicity
high speed and selectivity
All of these
good selectivity and reliability
economy and simplicity
high speed and selectivity
All of these
Answer
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