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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is
None of these
1500 A
1500/√3 A
750 A
None of these
1500 A
1500/√3 A
750 A
Answer
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To reduce short circuit fault currents......... are used.
capacitors
reactors
resistors
None of these
capacitors
reactors
resistors
None of these
Answer
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A circuit breaker is a
current limiting device
None of these
circuit interrupting device
current controlling device
current limiting device
None of these
circuit interrupting device
current controlling device
Answer
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The rate of rise of restriking voltage depends on
the capacitance of the system only
the type of circuit breaker
the inductance of the system only
both inductance and capacitance of the system
the capacitance of the system only
the type of circuit breaker
the inductance of the system only
both inductance and capacitance of the system
Answer
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The relay operating speed depends upon
the rate of flux built up
the spring tension
All of these
armature core air gap
the rate of flux built up
the spring tension
All of these
armature core air gap
Answer
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Most of the relays on service on electric power system are
electronic relays
electro-mechanical relays
None of these
thermal relays
electronic relays
electro-mechanical relays
None of these
thermal relays
Answer
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