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series reactors should have

low impedance
high impedance
high resistance
low resistance

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

12.5 A
3.125 A
6.25 A
25 A

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An isolator is designed to open a circuit under

normal conditions
no load
None of these
full load

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HRC fuses provide best protection against

open circuits
reverse current
short circuits
overload

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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is

60 kA
35 kA
80 kA
20 kA

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Distance relays are generally

none of these
impedance relays
split-phase relays
reactance relays

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