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In Railway applications ______ circuit breaker is used.
bulk oil
minimum oil
air break
SFe
bulk oil
minimum oil
air break
SFe
Answer
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A fuse should have
high conductivity
low cost
All of these
low melting point
high conductivity
low cost
All of these
low melting point
Answer
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The arcing contacts in a circuit breaker are made of
electrolytic copper
aluminium alloy
porcelain
copper tungsten alloy
electrolytic copper
aluminium alloy
porcelain
copper tungsten alloy
Answer
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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 neutral line
fault occurs on the bus itself
fault occurs with respect to earthing
two or more faults occur simultaneously
fault occurs on neutral line
fault occurs on the bus itself
fault occurs with respect to earthing
Answer
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Arc in a circuit breaker is interrupted at
maximum voltage
minimum voltage
maximum current
zero current
maximum voltage
minimum voltage
maximum current
zero current
Answer
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The reflection co-efficient at the open circuited end of a transmission line
unity
infinity
zero
None of these
unity
infinity
zero
None of these
Answer
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