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The information to the circuit breaker under fault conditions is provided by

relay
All of these
rewirable fuse
H.R.'only

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When the circuit breaker operates under fault conditions, the greatest noise is produced in

sf6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker
oil circuit breaker

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HRC fuses provide best protection against

reverse current
overload
open circuits
short circuits

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A differential relay measures the vector difference between

two voltages
two currents
None of these
two or more similar electrical quantities

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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is

60 kA
35 kA
80 kA
20 kA

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The operating time of a fuse is about

0.8 sec
1.5 sec
1 sec
0.002 sec

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