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Which of the following is the least expensive protection for over current is low voltage system ?
rewireable fuse
air break circuit breaker
oil circuit breaker
isolator
rewireable fuse
air break circuit breaker
oil circuit breaker
isolator
Answer
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The relay operating coil is supplied through
current transformer
power transformer
fuse
None of these
current transformer
power transformer
fuse
None of these
Answer
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A short-circuit is identified by
heavy current flow
no current flow
voltage rise
voltage drop
heavy current flow
no current flow
voltage rise
voltage drop
Answer
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To limit short-circuit current in a power system are used
H.R. fuses
earth wires
reactors
isolators
H.R. fuses
earth wires
reactors
isolators
Answer
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Insulation resistance of high voltage circuit breakers is more than
100 mega ohms
10 mega ohms
1 mega ohms
500 mega ohms
100 mega ohms
10 mega ohms
1 mega ohms
500 mega ohms
Answer
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The making capacity of a circuit breaker is equal to
√2 × symmetrical breaking capacity
None of these
2.55 × symmetrical breaking capacity
√3 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
None of these
2.55 × symmetrical breaking capacity
√3 × symmetrical breaking capacity
Answer
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