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A switchgear is device used for
interrupting an electrical circuit
switching an electrical circuit 111
switching, controlling and protecting the electrical circuit and equipment
switching and controlling an electrical circuit
interrupting an electrical circuit
switching an electrical circuit 111
switching, controlling and protecting the electrical circuit and equipment
switching and controlling an electrical circuit
Answer
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Wave trap is used to trap waves of
higher frequencies entering generator or transformer units
None of these
power frequencies
either of the above
higher frequencies entering generator or transformer units
None of these
power frequencies
either of the above
Answer
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An efficient and a well designed protective relaying should have
economy and simplicity
good selectivity and reliability
All of these
high speed and selectivity
economy and simplicity
good selectivity and reliability
All of these
high speed and selectivity
Answer
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If the fault occurs near the impedance relay, the V/ I ratio will be
constant for all distances
None of these
Lower than that of if fault occurs away from the relay
higher than that of if fault occurs away from the relay
constant for all distances
None of these
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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A short-circuit is identified by
voltage drop
heavy current flow
voltage rise
no current flow
voltage drop
heavy current flow
voltage rise
no current flow
Answer
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Most of the relays on service on electric power system are
electro-mechanical relays
thermal relays
None of these
electronic relays
electro-mechanical relays
thermal relays
None of these
electronic relays
Answer
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