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A real engine, operating between 1800 K and 900 K, has an efficiency that is 50% of the most efficient engine that can operate between those two...

29. A real engine, operating between 1800 K and 900 K, has an efficiency that is 50% of the most efficient engine that can operate between those two temperatures. What is the efficiency of this engine?


a. 50%

b. 25%

c. 30%

d. 40%

e. 12%



30. Which, of the following, is not a characteristic of an irreversible process in a closed system, such as the aging of the universe?


a.The randomness of the system will increase.

b. The entropy of the system will increase.

c. The probability of greater order is greater than the probability of lesser order.

d. The nature of the system is to become less ordered.

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Answers: (29) b. 25% (30) c. The... View the full answer

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