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SF 6 gas

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

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

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

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When the circuit breaker operates under fault conditions, the greatest noise is produced in

oil circuit breaker
sf6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker

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A.C. network analyzer is used to solve problems of

Load flow and stability
Load flow and short-circuit
Load flow
Load flow, short-circuit and stability

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Interruption of large currents by relay requires

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

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

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

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