TAILIEUCHUNG - physics_test_bank_split_22

Tham khảo tài liệu 'physics_test_bank_split_22', khoa học tự nhiên, vật lý phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http 37. A Carnot cycle A. is bounded by two isotherms and two adiabats on a p-V graph B. consists of two isothermal and two constant volume processes C. is any four-sided process on a p-V graph D. only exists for an ideal gas E. has an efficiency equal to the enclosed area on a p-V diagram ans A 38. According to the second law of thermodynamics A. all heat engines have the same efficiency B. all reversible heat engines have the same efficiency C. the efficiency of any heat engine is independent of its working substance D. the efficiency of a Carnot engine depends only on the temperatures of the two reservoirs E. all Carnot engines theoretically have 100 efficiency ans D 39. A Carnot heat engine operates between 400 K and 500 K. Its efficiency is A. 20 B. 25 C. 44 D. 79 E. 100 ans A 40. A Carnot heat engine operates between a hot reservoir at absolute temperature Th and a cold reservoir at absolute temperature Tc. Its efficiency is A. Th Tc B. Tc Th C. 1 - Th Tc D. 1 - Tc Th E. 100 ans D 41. A heat engine operates between a high temperature reservoir at Th and a low temperature reservoir at Tl. Its efficiency is given by 1 Tl Th A. only if the working substance is an ideal gas B. only if the engine is reversible C. only if the engine is quasi-static D. only if the engine operates on a Stirling cycle E. no matter what characteristics the engine has ans B 316 Chapter 20 ENTROPY AND THE SECOND LAW OF THERMODYNAMICS Simpo PDF Merge and Split Unregistered Version - http 42. The maximum theoretical efficiency of a Carnot heat engine operating between reservoirs at the steam point and at room temperature is about A. 10 B. 20 C. 50 D. 80 E. 99 ans B 43. An inventor claims to have a heat engine that has an efficiency of 40 when it operates between a high temperature reservoir of 150 C and a low temperature reservoir of 30 C. This engine A. must violate the zeroth law of thermodynamics B. must

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