quiz3

# quiz3 - Exam Name MULTIPLE CHOICE Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The interior of a house is maintained at 20 degree Celsius while the outdoor temperature is -10 degree Celsius. The house looses heat at the rate of 30kW. At what rate does the entropy of the universe increase because of this irreversible heat flow? A) Not at all. B) 11.7 J/K*s C) 55.4 J/K*s D) 253 J/K*s E) 1.5 kJ/K*s 1) 2) For a refrigerator, is it better to have T h close to T c or to have T h and T c differ significantly? A) T h and T c differ significantly B) T h and T c close to each other C) Doesn't matter. 2) 3) Two heat engines operate with the same temperature difference, but have different efficiencies. The one operating between the lower T h and T c is the less efficient of the two. Why? A) Not true. Should be the other way around. B) Not true. Efficiency depends only on the difference in temperature.

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quiz3 - Exam Name MULTIPLE CHOICE Choose the one...

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