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Minimum arcing voltage will be least in case of

tungsten
graphite
silver
carbon

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To limit short-circuit current in a power system are used

H.R. fuses
isolators
reactors
earth wires

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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

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With which of the following, a circuit breaker must be equipped for remote operation ?

inverse time trip
shunt trip
time-delay trip
None of these

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Which of the following circuit breakers is prefered for EHT applications ?

bulk oil circuit breaker
Sf6 CB
air break circuit breaker
low oil circuit breaker

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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

None of these
750 A
1500/√3 A
1500 A

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