Physics
Transformer is a device to convert

C. to A.C.
Mechanical energy into Electrical energy
Low voltage A.C. into high voltage A.C.
Low voltage D.C. into high voltage D.C.

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Physics
Circuit breaker usually operate under

After D. C. component has ceased
Transient state of short-circuit current
Sub-transient state of short-circuit current
Steady state of short-circuit current

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