Under which one of the following conditions would a Carnotheat engine be 100% ef

Question

Under which one of the following conditions would a Carnotheat engine be 100% efficient? A. The engine does no work. B. The engine uses no heat. C. The engine discharges heat at 0 K. D. The engine can be operated in reverse. E. The engine uses an ideal gas. Under which one of the following conditions would a Carnotheat engine be 100% efficient? A. The engine does no work. B. The engine uses no heat. C. The engine discharges heat at 0 K. D. The engine can be operated in reverse. E. The engine uses an ideal gas.

Explanation / Answer

Under which one of the following conditions would a Carnotheat engine be 100% efficient? A. The engine does no work. B. The engine uses no heat. C. The enginedischarges heat at 0 K. D. The engine can be operated in reverse. E. The engine uses an ideal gas. .    Efficiency = 1 - cold T / hotT           sothis is only equal to 1 if cold temp is zero . Answer C is the ONLY correct answer! The thirdresponse (below mine) says that E is also correct, but he is wrong.Using an ideal gas does NOT make a Carnot engine 100%efficient. . In reality it is impossible to create a heat enginethat is 100% efficient. This was the foundation of Carnot's work,which was published in the early 1800's. The only thing, in theory,that could make the engine 100% efficient is if the heat isexpelled at zero Kelvin... which is physicallyimpossible. . Answer C is the ONLY correct answer! The thirdresponse (below mine) says that E is also correct, but he is wrong.Using an ideal gas does NOT make a Carnot engine 100%efficient. . In reality it is impossible to create a heat enginethat is 100% efficient. This was the foundation of Carnot's work,which was published in the early 1800's. The only thing, in theory,that could make the engine 100% efficient is if the heat isexpelled at zero Kelvin... which is physicallyimpossible.

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