A rigid and uninsulated tank initially contains 2 kg of water in saturated liqui

Question

A rigid and uninsulated tank initially contains 2 kg of water in saturated liquid state at 130degreeC. The water is stirred by a paddle wheel and the paddle does 50 kJ of work on the water. After this process, the equilibrium is reached, and the final temperature in the tank is 100degreeC. If the entropy change of the water during this process is zero, 15) What is the initial pressure in the tank in kPa? a) 0.7014 b) 101.4 c) 270.1 d) 617.8 e) 814.5 16) What is the internal energy at the initial state in kJ/kg? a) 245.3 b) 360.2 c) 418.9 d) 546.02 e) 588.7 17) What is the final pressure in the tank in kPa? a) 0.7014 b) 101.4 c) 270.1 d) 617.8 e) 814.5 18) What is the quality in the final state? a) 0.011 b) 0.054 c) 0.24 d) 0.37 e) 0.44 19) Assuming that the quality in the final state is 0.02, what is the internal energy at the final state in kJ/kg? a) 324.3 b) 387.6 c) 415.8 d) 451.3 e) 460.7 20) Assuming the internal energy at the final state is 200 kJ/kg, what is the amount of heat transferred to the surrounding environment during this process in kJ? a) -742 b) 742 c) -692 d) -842 e) 842 21) Assuming the amount of heat transferred to the surrounding environment is 2000 kJ and the external wall temperature stays constant at 10degreeC during this process, what is the amount of entropy generated during this process in kJ/K? a) 7.067 b) -7.067 c) 2.978 d) -2.978 e) 0

Explanation / Answer

15) Ans: c) 270.1 kPa

16) Ans: d) 546.02 kJ/kg

17) Ans: b) 101.4 kPa

19) Ans: e) 460.7 kJ/kg

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