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Overheating of relay contacts or contact born out is due to
foreign matter on the contact surface
all of these
slow making and breaking of load circuit contacts
too low contact pressure
foreign matter on the contact surface
all of these
slow making and breaking of load circuit contacts
too low contact pressure
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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be
more than 1000 A
300 A
100 A
200 A
more than 1000 A
300 A
100 A
200 A
Answer
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A fuse performs
detection function only
None of these
both detection and interruption functions
circuit interruption function only
detection function only
None of these
both detection and interruption functions
circuit interruption function only
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The rating of a circuit breaker is generally determined on the basis of
single line to ground fault current
line to line fault current
symmetrical fault current
double line to ground fault current
single line to ground fault current
line to line fault current
symmetrical fault current
double line to ground fault current
Answer
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series reactors should have
low resistance
high impedance
low impedance
high resistance
low resistance
high impedance
low impedance
high resistance
Answer
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To limit short-circuit current in a power system are used
isolators
earth wires
H.R. fuses
reactors
isolators
earth wires
H.R. fuses
reactors
Answer
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