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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is
2
8
6
4
2
8
6
4
Answer
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The information to the circuit breaker under fault conditions is provided by
rewirable fuse
relay
H.R.'only
All of these
rewirable fuse
relay
H.R.'only
All of these
Answer
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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is
25 A
3.125 A
6.25 A
12.5 A
25 A
3.125 A
6.25 A
12.5 A
Answer
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SF 6 gas
is lighter than air
is yellow in colour
Is nontoxic
has pungent small
is lighter than air
is yellow in colour
Is nontoxic
has pungent small
Answer
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Arc in a circuit breaker behaves as
a resistance increasing with voltage rise across the arc
an inductive reactance
a resistance decreasing with voltage rise across the arc
a capacitive reactance
a resistance increasing with voltage rise across the arc
an inductive reactance
a resistance decreasing with voltage rise across the arc
a capacitive reactance
Answer
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The relay operating speed depends upon
armature core air gap
All of these
the spring tension
the rate of flux built up
armature core air gap
All of these
the spring tension
the rate of flux built up
Answer
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