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ME302 s06 thermodynamics exam1 part1 and2

ME302 s06 thermodynamics exam1 part1 and2 - A Name_g_v ME...

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Unformatted text preview: A , . Name ____,_____._g_v_;_____ \ ME 302 THERMODYNAMICS Spring 2006 Exam 1, Part 1 V Instructions: 8 Q: 1) The exam is worth 100 points, 40 of which are given for this part. 2) No assumptions or system boundaries must be identified for this part. 1. (5 points each, 40 points total) Answer the following questions briefly. +13 a) How many independent intensive properties must we know to fix all the other intensive properties of a simple system? What is the name of the rule that determines this for us? Z 9014"! @5414 lav‘l‘ew 3/. v" b) If a window air conditioner were placed on a table inside a room and operated, would the room temperature increase, decrease, or stay the same? ln (ft? on .91 , ,/ v" c) If the state of a thermodynamic system is fully known, which (if any) of the following quantities are NOT known... P, v, T, W, h, E, U, Q? V W + a 1 W5 plan; (a ’a‘le 90/!» Svl-M'z bM-l- (M444,- , (A 9/9 oz: g v (1) Using the following superheated R22 vapor data, what is the specific volume at 5 OC and 1.4 bar (provide 4 significant figures)? p=1.0bar p=1.5bar T (°C) v (m3/kg) u (kJ/kg) T CC) v (m3/kg) u (kJ/kg) 0 0.25747 232.26 0 0.16987 231.70 5 0.26251 235.04 5 0.17331 234.42 10 0.26753 237.74 10 0.17674 237.15 / V . l— * —— 0 3925 0473’ _ 0-0832 0.262f7 40.07126 :‘ 0"q”5M3/kl (/0 0:23q ; 0.07/39 3 e) 0.02 kg of N2 (an ideal gas) undergoes an isothermal process from V1 = 1 m3 to V2 = 2 m3 . What is the change in enthalpy during this process? ”5 Name ram ME 302 THERMODYNAMICS Spring 2006 EXAM 1, Part 2 Instructions: 1) The exam is worth 100 points, 60 of which are given for this part. 2) Show all your work and clearly mark your final answers. 3) Be neat. Partial'credit can only be earned if I can follow your solution. Wing processes in series: f“ Process A: Constant pressure process from p= 30 lbf/inz, x=0.95 to a final temperature = 40 0F. Process B: Constant temperature process to saturated vapor with W = -11.82 Btu. Process C: Adiabatic expansion ending at p= 30 lbf/inz, x=0.95. a) Sketch the processes on the following diagrams (16 points). 33-1”? b) Is this a power cycle or a refrigeration/heat pump cycle? (4 points) {dc/fa) /}\!,‘4_ PM”? \/ 0) Fill in the following chart (40 points): Process ncaA "WK (Calculation Area for part 0. Please work neatly) 46’5"” (rhea ’> “‘1. 59/002 55 ,7. f - “sum camfid. P v u) 3 9V2 PJV *- «55%;. (zvmibk play!!! flf, ” 0.007% Mum» : 0.65 ),'7\/}o - o,ow><z n1, : 1.454 m/zb A. V“: mac; Av); h (4,.“ 4qsl—L A-QE ’ ‘ ;\ luv-”fix meuu A ' 30% <1M(,'QYS? LSSQ ?/M>>( M \ v ' f “/2“. 7'4 M: 84% 5751') W; Wp/uugA "g3 8414 U 4-7.3? A” : G [W /A LOP’S MA‘M'lA-\: Q“ lg; /’:;;. M(1 613' 5'” _ /Oo_v~ 373$ + f, 272 T Q 1‘ MIA”: "€33 (f Y, “/15 GA; /'?.?'7 E'T‘M\ MLA : [DO-V B’TM/Ib AE :- 0 Aug 2 eg ( we?) 0% V :_ U.) Q’(v%- )ooN 8114/sz —- II, 82 1‘ QB 635‘ “at (98,09—100,")—/hn : <93 web‘fih/v‘o 3 "33 “MEL" “3: Q3" — —IV1(K) 3TM\ We 3 33-2; 311:1 MW"““MM ,, ...
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