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HRC fuses provide best protection against

open circuits
reverse current
short circuits
overload

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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

200 A
more than 1000 A
300 A
100 A

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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

1500 A
None of these
1500/√3 A
750 A

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Minimum arcing voltage will be least in case of

silver
tungsten
carbon
graphite

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A fuse is never inserted in

negative of dc circuit
phase line
neutral wire
positive of dc circuit

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The rate of rise of restriking voltage depends on

the capacitance of the system only
the inductance of the system only
both inductance and capacitance of the system
the type of circuit breaker

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