Physics
Circuit breaker usually operate under

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

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Physics
A white and smooth surface is

Bad absorber and good reflector of heat
Bad absorber and bad reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat

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