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

20 kA
60 kA
35 kA
80 kA

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A differential relay measures the vector difference between

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

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Insulation resistance of high voltage circuit breakers is more than

100 mega ohms
10 mega ohms
1 mega ohms
500 mega ohms

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The single phasing relays are used for the protection of

two single phase motors running in parallel
single phase motors only
three phase motors
two phase motors only

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Resistance grounding is used for voltage between

33 kV to 66 kV
3.3 kV to 11 kv
None of these
11 kv to 33 kv

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protection of fuses is generally not used beyond

20 A
50 A
100 A
200 A

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