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For which of the following protection from negative sequence currents is provided ?
Generators
Transformers
Transmission line
Motors
Generators
Transformers
Transmission line
Motors
Answer
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For interrupting of high voltage and low current, the circuit breaker prefered is
all are correct
oil circuit breaker
vaccum circuit breaker
air-blast circuit breaker
all are correct
oil circuit breaker
vaccum circuit breaker
air-blast circuit breaker
Answer
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Back up protection is generally used for protection against
open-circuit faults only
both open and short-circuit faults
short-circuit faults only
None of these
open-circuit faults only
both open and short-circuit faults
short-circuit faults only
None of these
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Arc in a circuit breaker is interrupted at
zero current
maximum current
minimum voltage
maximum voltage
zero current
maximum current
minimum voltage
maximum voltage
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The current rating of a fuse is 5A. The fusing current will be
2.5 A
1 A
more than 5A
5 A
2.5 A
1 A
more than 5A
5 A
Answer
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The rate of rise of restriking voltage depends on
the inductance of the system only
the type of circuit breaker
the capacitance of the system only
both inductance and capacitance of the system
the inductance of the system only
the type of circuit breaker
the capacitance of the system only
both inductance and capacitance of the system
Answer
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