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

80 kA
60 kA
20 kA
35 kA

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Interruption of large currents by relay requires

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

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Which of the following is the least expensive protection for over current is low voltage system ?

rewireable fuse
oil circuit breaker
isolator
air break circuit breaker

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SF6 gas

has pungent small
is nontoxic
is yellow in colour
None of these
is lighter than air

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A fuse element is generally made of

brass
silver
steel
iron

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Minimum arcing voltage will be least in case of

graphite
silver
carbon
tungsten

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