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An isolator is designed to open a circuit under

no load
normal conditions
None of these
full load

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The fuse wire, in DC circuit, is inserted in

negative circuit only
Both positive and negative circuit
positive circuit only
None of these

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Overheating of relay contacts or contact born out is due to

foreign matter on the contact surface
slow making and breaking of load circuit contacts
all of these
too low contact pressure

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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
4
6

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The rate of rise of restriking voltage depends on

the capacitance of the system only
the inductance of the system only
the type of circuit breaker
both inductance and capacitance of the system

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To protect most of the electrical equipment handling low power, the types of relays used are

Thermocouple
None of these
Electronic and bimetallic
Both of the listed here

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