Physics
Circuit breaker usually operate under

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

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Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water
Boiling point of heavy water is lower than that or ordinary water

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