True or False: A nonideal engine operating between the same temperature extremes

Question

True or False: A nonideal engine operating between the same temperature extremes as a Carnot engine and having the same input thermal energy will perform the same amount of work as the Carnot engine. Explain. (Select all that apply.)

True. The Carnot engine is a model that accurately describes all heat engines.
False. All other engines operating between the two temperatures produce more useful work output than the Carnot engine for the same work input.
False. Since the Carnot engine has the greatest efficiency possible, other engines operating between the two temperatures produce less useful work output for the same work input.
False. Carnot engines do not really exist. All real engines are less efficient.
True. The efficiency of any heat engine is determined only by its input and output temperatures.

Explanation / Answer

False. Carnot engines do not really exist. All real engines are less efficient.

False. Since the Carnot engine has the greatest efficiency possible, other engines operating between the two temperatures produce less useful work output for the same work input.

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