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An isolator is designed to open a circuit under
None of these
full load
no load
normal conditions
None of these
full load
no load
normal conditions
Answer
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Related Question
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Overheating of relay contacts or contact born out is due to
slow making and breaking of load circuit contacts
all of these
too low contact pressure
foreign matter on the contact surface
slow making and breaking of load circuit contacts
all of these
too low contact pressure
foreign matter on the contact surface
Answer
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HRC fuses provide best protection against
overload
short circuits
reverse current
open circuits
overload
short circuits
reverse current
open circuits
Answer
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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
6
2
4
8
6
2
4
8
Answer
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The single phasing relays are used for the protection of
three phase motors
two single phase motors running in parallel
two phase motors only
single phase motors only
three phase motors
two single phase motors running in parallel
two phase motors only
single phase motors only
Answer
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Arc in a circuit breaker behaves as
a capacitive reactance
an inductive reactance
a resistance increasing with voltage rise across the arc
a resistance decreasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance increasing with voltage rise across the arc
a resistance decreasing with voltage rise across the arc
Answer
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