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Most of the relays on service on electric power system are
None of these
electronic relays
electro-mechanical relays
thermal relays
None of these
electronic relays
electro-mechanical relays
thermal relays
Answer
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Resistance grounding is used for voltage between
33 kV to 66 kV
11 kv to 33 kv
3.3 kV to 11 kv
None of these
33 kV to 66 kV
11 kv to 33 kv
3.3 kV to 11 kv
None of these
Answer
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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is
750 A
None of these
1500/√3 A
1500 A
750 A
None of these
1500/√3 A
1500 A
Answer
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SF6 gas
has pungent small
is lighter than air
is yellow in colour
None of these
is nontoxic
has pungent small
is lighter than air
is yellow in colour
None of these
is nontoxic
Answer
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To limit short-circuit current in a power system are used
earth wires
H.R. fuses
reactors
isolators
earth wires
H.R. fuses
reactors
isolators
Answer
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An isolator is designed to open a circuit under
full load
normal conditions
no load
None of these
full load
normal conditions
no load
None of these
Answer
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