Physics
Circuit breaker usually operate under

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

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Physics
Stationary wave is formed by

A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing

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