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Overheating of relay contacts or contact born out is due to
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
foreign matter on the contact surface
Answer
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Arc in a circuit breaker behaves as
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
a capacitive reactance
an inductive reactance
a resistance decreasing with voltage rise across the arc
a resistance increasing with voltage rise across the arc
Answer
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Admittance relay is
directional relay
non-directional relay
impedance relay
None of these
directional relay
non-directional relay
impedance relay
None of these
Answer
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Arc in a circuit breaker is interrupted at
maximum current
maximum voltage
zero current
minimum voltage
maximum current
maximum voltage
zero current
minimum voltage
Answer
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Directional relay are based on flow of
voltage wave
All of these
power
current
voltage wave
All of these
power
current
Answer
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For which of the following protection from negative sequence currents is provided ?
Transformers
Transmission line
Motors
Generators
Transformers
Transmission line
Motors
Generators
Answer
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