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In a single bus-bar system there will be complete shut down when
two or more faults occur simultaneously
fault occurs with respect to earthing
fault occurs on neutral line
fault occurs on the bus itself
two or more faults occur simultaneously
fault occurs with respect to earthing
fault occurs on neutral line
fault occurs on the bus itself
Answer
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An isolator is designed to open a circuit under
full load
None of these
normal conditions
no load
full load
None of these
normal conditions
no load
Answer
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Resistance grounding is used for voltage between
33 kV to 66 kV
None of these
11 kv to 33 kv
3.3 kV to 11 kv
33 kV to 66 kV
None of these
11 kv to 33 kv
3.3 kV to 11 kv
Answer
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SF6 gas
has pungent small
is lighter than air
is yellow in colour
is nontoxic
None of these
has pungent small
is lighter than air
is yellow in colour
is nontoxic
None of these
Answer
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If the fault occurs near the impedance relay, the V/ I ratio will be
constant for all distances
Lower than that of if fault occurs away from the relay
None of these
higher than that of if fault occurs away from the relay
constant for all distances
Lower than that of if fault occurs away from the relay
None of these
higher than that of if fault occurs away from the relay
Answer
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Back up protection is generally used for protection against
short-circuit faults only
both open and short-circuit faults
open-circuit faults only
None of these
short-circuit faults only
both open and short-circuit faults
open-circuit faults only
None of these
Answer
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