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# MAE 320- HW 7B This comprehensive homework is due Wednesday, December 5th, 2012. Each problem is worth the points indicated. Copying of the solution

Could really use help on 3-7, but any help would be great. Thanks!

1 MAE 320– HW 7B This comprehensive homework is due Wednesday, December 5 th , 2012. Each problem is worth the points indicated. Copying of the solution from another is not acceptable 1. Multi-choice, multi-answer question (35 Points) 1a. For ideal gas, please circle the property parameters which are functions of temperature only? (a) Specific internal energy u (b) Specific entropy s (c) Specific internal energy of ideal gas at ambient pressure: o s (d) Relative pressure r P (e) Relative specific volume r v 1b. The transfer of entropy is usually associated with (a) The transfer of mechanical work such as shaft work; (b) The transfer of electrical work; (c) The transfer of heat; (d) The transfer of mass; 1c. The mechanisms of entropy transfer include (a) Transfer of mechanical work; (b) Mass transfer; (c) Heat transfer; (d) Transfer of electricity; 1d. Please circle the parameters which are conserved in thermodynamics (a) Mass; (b) Energy; (c) Entropy; (d) All above; 1e. Please circle the cases satisfying the conservation of energy. (a) Closed system; (b) Isolated system; (c) Control volume system under steady operation; (d) Control volume under unsteady operation;
2 1f. For an isolated system, please circle the parameter which will change with time. (a) Total energy; (b) Total mass; (c) Total entropy; (d) Al above; 1g. For an actual cycle, please circle the valid equations (a) 0 = dS ; (b) > Δ 0 T Q (c) = Δ 0 T Q ; (d) < Δ 0 T Q ; (e) 0 < gen S ; (f) 0 > gen S ; (g) 0 = gen S 2. Short answer questions (20 Points) 2a. List all intensive properties learned in thermodynamics. (3 points) 2b. Please drive equation C TP k k = 1 using isentropic process equation: C Pv k = and ideal gas equation: RT Pv = . (3 points) 2c. List all conditions needed to apply equation: 1 2 1 2 r r P P P P = (3 points) 2d. List all statements and principles associated with the 2 nd law of thermodynamics. 2e. Please find specific entropy of water at the following conditions and have them presented in the attached T-S diagram in next page: (6 points) (a) bar P 10 = , C T ° = 400 ; (b) C T ° = 600 , kg kJ h / 3600 = ; (c) bar P 40 = , 3 . 0 = x
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