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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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 Spring '08
 Landau
 Dynamics, Thermodynamics, Mass Transfer, Heat engine, 3.077%, 6.154%, 7.692%, 9.231%

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