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Current chopping mainly occurs in
oil circuit breaker
vaccum circuit breaker
sf 6 circuit breaker
air-blast circuit breaker
oil circuit breaker
vaccum circuit breaker
sf 6 circuit breaker
air-blast circuit breaker
Answer
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Which of the following is the least expensive protection for over current is low voltage system ?
oil circuit breaker
isolator
rewireable fuse
air break circuit breaker
oil circuit breaker
isolator
rewireable fuse
air break circuit breaker
Answer
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The fuse wire, in DC circuit, is inserted in
None of these
Both positive and negative circuit
negative circuit only
positive circuit only
None of these
Both positive and negative circuit
negative circuit only
positive circuit only
Answer
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Admittance relay is
None of these
impedance relay
non-directional relay
directional relay
None of these
impedance relay
non-directional relay
directional relay
Answer
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With which of the following, a circuit breaker must be equipped for remote operation ?
inverse time trip
time-delay trip
shunt trip
None of these
inverse time trip
time-delay trip
shunt trip
None of these
Answer
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A differential relay measures the vector difference between
two voltages
None of these
two currents
two or more similar electrical quantities
two voltages
None of these
two currents
two or more similar electrical quantities
Answer
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