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Results of Quiz 6 - experienced during the cycle the net...

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Question 1 The change in system entropy that occurs when the matter inside a system undergoes a change of state is equal to the integral of the heat flow that would be required if the change was accomplished by an internally reversible process normalized by the temperature at which the heat transfer occurred. X True 96.923% False 3.077% Question 2 In a Carnot heat engine cycle, the total amount of energy that enters as heat leaves as heat. True 23.077% X False 76.923% Question 3 For isothermal expansion of an ideal gas the system entropy stays constant. True 9.231% X False 90.769% Question 4 When operating between two thermal reservoirs that have nearly the same temperature, a Carnot heat engine has an efficiency of nearly zero. X True 92.308% False 7.692% Question 5 When analyzing a Carnot heat engine, knowing the initial pressure and volume as well as the pressure and volume after the isothermal and adiabatic expansions are complete allows calculations of: all the other pressure-volume combinations
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Unformatted text preview: experienced during the cycle, the net output of work, the required heat input and the changes in entropy - all proving the state principle is indeed a handy observation. X True 89.231% False 10.769% Question 6 The entropy of a closed system can never decrease. True 36.923% X False 63.077% Question 7 Mechanical work can move energy into or out of a system without changing the entropy as long as the work is reversible. X True 86.154% False 13.846% Question 8 Entropy is a property therefore if entropy changes as a result of irreversibities, and if pressure is held constant, all the other properties must change. X True 93.846% False 6.154% Question 9 In the Carnot refrigerator cycle there is no heat transfer into the system, just work and heat transfer out. True 20% X False 80% Question 10 Energy balance for a reversible cycle becomes Q - W = 0 X True 80% False 20%...
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