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In a single bus-bar system there will be complete shut down when
two or more faults occur simultaneously
fault occurs on the bus itself
fault occurs on neutral line
fault occurs with respect to earthing
two or more faults occur simultaneously
fault occurs on the bus itself
fault occurs on neutral line
fault occurs with respect to earthing
Answer
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Arc in a circuit breaker is interrupted at
maximum current
zero current
maximum voltage
minimum voltage
maximum current
zero current
maximum voltage
minimum voltage
Answer
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Overheating of relay contacts or contact born out is due to
too low contact pressure
all of these
slow making and breaking of load circuit contacts
foreign matter on the contact surface
too low contact pressure
all of these
slow making and breaking of load circuit contacts
foreign matter on the contact surface
Answer
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Relay can be designed to respond to changes in
voltage and current
All of these
temperature
resistance, reactance and impedance
voltage and current
All of these
temperature
resistance, reactance and impedance
Answer
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The arcing contacts in a circuit breaker are made of
aluminium alloy
electrolytic copper
copper tungsten alloy
porcelain
aluminium alloy
electrolytic copper
copper tungsten alloy
porcelain
Answer
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To limit short-circuit current in a power system are used
reactors
H.R. fuses
earth wires
isolators
reactors
H.R. fuses
earth wires
isolators
Answer
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