A current-limiting circuit breaker performs in a manner similar to conventional thermomagnetic circuit breakers at currents below a threshold of about _____
A) 1,000A B) 700A C) 600A D) 800A
A
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Normally open and normally closed mean that the contacts are ____.
a. subject to external forces b. subject to mechanical forces c. in a rest position d. held by surface tension
When we have multiple power sources and use the superposition theorem to determine just how much each power source contributes toward the branch currents, we do this by considering ____.
a. only one power source at a time b. all the power sources at one time c. at least two power sources at a time d. only half of the power sources
Which of the following is true?
A. The equation “dH = MCPdT” can be used to find the change in enthalpy when liquid boils into vapor, as long as the boiling occurs at constant pressure. B. All compounds have the same normal boiling point, since the normal boiling point is always defined at P = 101.325 kPa. C. If you compress a gas isothermally, it will condense into a liquid. D. The heat capacity of a substance in the liquid phase need not be the same as the heat capacity of that same substance in the vapor phase. E. None of the above are true.
Transportation inventories can be reduced by:
A) reducing transportation time. B) increasing order quantities. C) reducing the order point. D) reducing order quantities. E) none of the above