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Wave trap is used to trap waves of
higher frequencies entering generator or transformer units
None of these
either of the above
power frequencies
higher frequencies entering generator or transformer units
None of these
either of the above
power frequencies
Answer
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The fault that imposes severest duty on the circuit breaker is
two lines to ground fault
line to line fault
line to ground fault
all three lines short-circuited
two lines to ground fault
line to line fault
line to ground fault
all three lines short-circuited
Answer
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Most of the relays on service on electric power system are
electronic relays
thermal relays
None of these
electro-mechanical relays
electronic relays
thermal relays
None of these
electro-mechanical relays
Answer
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Arc in a circuit breaker behaves as
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
an inductive reactance
a capacitive reactance
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
an inductive reactance
a capacitive reactance
Answer
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A circuit breaker must perform the duty of
opening the faulty circuit and breaking the fault current
carrying fault current for a short time
being closed on to a fault
All of these
opening the faulty circuit and breaking the fault current
carrying fault current for a short time
being closed on to a fault
All of these
Answer
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To limit short-circuit current in a power system are used
H.R. fuses
reactors
earth wires
isolators
H.R. fuses
reactors
earth wires
isolators
Answer
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