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Air blast circuit breaker is used for

short duty
repeated duty
intermittent duty
over currents

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HRC fuses provide best protection against

short circuits
reverse current
open circuits
overload

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The fuse rating is expressed in terms of

VAR
current
voltage
kVA

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Interruption of large currents by relay requires

wide separation of the opened contacts
arc suppressing blow out coils
all of these
high speed opening of contacts

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When transmission line is energized, the wave that propagates on it is

both current wave and voltage wave
power factor wave only
voltage wave only
current wave only

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The fuse wire, in DC circuit, is inserted in

Both positive and negative circuit
negative circuit only
None of these
positive circuit only

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