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SF 6 gas

is yellow in colour
is lighter than air
has pungent small
Is nontoxic

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Interruption of large currents by relay requires

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

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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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The fuse wire, in D.C. circuits, is inserted in

positive circuit only
negative circuit only
Both of the listed here
none of the listed here

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

35 kA
60 kA
20 kA
80 kA

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A fuse element is generally made of

silver
iron
brass
steel

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