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SF 6 gas

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

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An efficient and a well designed protective relaying should have

high speed and selectivity
economy and simplicity
All of these
good selectivity and reliability

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A differential relay measures the vector difference between

two or more similar electrical quantities
two currents
two voltages
None of these

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For the protection of power station buildings against direct strokes the requirements are

interception
interception, conduction and dissipation
interception, conduction, dissipation and reflection
None of these
interception and conduction

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The fault that imposes severest duty on the circuit breaker is

line to ground fault
two lines to ground fault
line to line fault
all three lines short-circuited

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A fuse in a motor circuit provides protection against

short-circuit and overload
None of these
open circuit, short-circuit and overload
overload

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