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A fuse should have

All of these
high conductivity
low cost
low melting point

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Circuit breakers usually operate under

after dc component has ceased
transient state of short circuit current
steady state of short circuit current
sub-transient state of short circuit current

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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
1500 A
750 A
1500/√3 A

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The rating of a circuit breaker is generally determined on the basis of

single line to ground fault current
double line to ground fault current
symmetrical fault current
line to line fault current

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HRC fuses provide best protection against

overload
short circuits
reverse current
open circuits

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Air blast circuit breaker is used for

repeated duty
over currents
short duty
intermittent duty

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