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Unformatted text preview: MEEN 227 « Fall 2006, Exam 1 Name 3 a («J—3’40 n5. ID No. 1. Multiple choice problems worth 2 pts each. Circle the answer that is the most appropriate or CIOSest (numerically) to your answer. 1. Routinely writing down as a final answer the maximum number of digits that can be displayed by your calculator is A. Correct C. Required . Misleading D. Helpful A. energy C. heat B. work 0 mass 3. A mass of 3 1bm is accelerated at a rate 5 ft/s2 by a force. What will be the acceleration rate in fi/s2 if the mass and force are both doubled. 5 C. 20 B. 10 D. Cannot be determined F} :7 M'Ql 1:2sz 4.2 Farapl QF‘ =Qm'ql "‘3'ng Fl -E"“ -= 4 7:: = “M Mr 1 a :61; tsg'ésa 4. The law that serves as the fundamental basis for thermometry and temperature measurement in general is A, Rankine’s Law © Zeroth law of thermodynamics B. Boyle’s Law D. First law of thermodynamics MEEN 227 — Fall 2006, Exam 1 Name 8 O L.) V7 5 IDNo. 5. An isothermal process is: A. A process Where pressure remains constant B. A process where volume remains constant (9 A special polytropic process where n = 1. D. A special polytropic process where n = 0. 6. Which of the following have only intensive properties? A. T,P,H C. m,v,V x,h,u D. v,T,U 7. The critical point defines A. The point when solid water becomes a vapor. B. The temperature when any substance becomes a vapor C. The temperature and pressure when water is no longer liquid The temperature, pressure and volume at which an equilibrium phase change between vapor and liquid ceases to exist. 8. Total work is A path—dependent function of a process C. An exact differential B. An extensive property of a substance D. A quantity used to define a state I K MEEN 227 — Fall 2006, Exam 1 Name SOLUngnJ ID No. 9. To what thermodynamic variables do the letters on the figure correspond? A. y=P,x=T,i=v1,j=V2,v1>\/2 13- y=TaX=VaiZPLj=P2aPI>P2 C. y:P,X:V,i=T1,j=T2,T1<T2 y=Pax=V9i=T1,j:T2,T1>T2 10. Determine the compressibility factor for R—134a at 80.3 atm and 280 °F. A. 0.6 C. 0.2 P.— goedm 2c we‘regfi; : “‘30 [9310; ® 0.4 D. Less than 0.2 . 05c. COMIFFQSS-l AII‘J'V (.1,er (p"3,A‘3“lb>l P g "f... :- {380 : a r ' h. sea/.7 “ , :1: _ 980+ 957.65?- z I I ‘ " 't’e m3? % 4' o q 4 MEEN 227 — Fan 2006, Exam 1 Name 39 ID No. II. Four work—out problems worth 20 points each. 1. The gravitational acceleration g as a function of altitude h above sea level is approximately given by g : a — bh, Where a = 9.81 III/3602 and b m 3.32 X 10—6 sec—2. Determine the altitude above sea level where the weight of an object decreases by 3 %. (20 pts) F: mgr PPM :@.<3lmn gnaw—bin) 0.0131931): ‘1‘31— 3.352 x/o‘ék 0910191) _ at?! (A - 3-32 x/O‘é’ 333$ y/o3m r MEEN 227 —— Fall 2006, Exam 1 Name 3 l :l: a n S ID No. 2. Consider that the atmosphere is a column of air 65,000 ft tall (measured from sea level) rising above you. Compute the average specific volume in ft3 /1bm. If you make any assumptions in order to work this problem be sure and state them clearly. (20 pts) AXSUMc (PO: ¢ 3: ££Sa ‘P: W. (0% [ma 6 la: $33900 lie. : ?,OQ?Qw0—é “72'?” '39. PM] (Am-43¢ Ln —{3{" pt: I”, _32 MEEN 227 — Fall 2006, Exam 1 Name 3 o A; 11:4 :0 5 ID No. 3. Air in a vertical fiictionless piston—cylinder device (piston is on top as shown in the figure) is initially at 14.6 psia and T = 75 0F. The initial volume in the device is 3.53 13:3. The cylinder is connected to a high-pressure air source via a line with a closed valve. The valve slowly is opened and 0.5 lbm of air is admitted to the cylinder slowly. The final temperature in the cylinder is 260 °F. A. Determine the specific volume in fi3/lbm in the piston—cylinder device before the valve is opened. (5 pts) B. What is the final pressure in psia in the piston—cylinder device? State 1 Note: if you cannot find this pressure and need it later, use 20 psia P1 = 14.6 psia (not the correct value). (3 pts) T1 = 75 °F v1 = 3.53 ft3 C. What is the final mass in the piston cylinder device? (5 pts) valve ls mmally D. Determine the total work in Btu done during the process. (7 pts) closed. - .3 ‘9 U: 31‘, Rm} : 0. Evocl 3% 7,: 45°F 1» «157.6? P - .— S‘SLI. Q? E sac “7M 2 v, , [.1 a Mass 0“: "FL! PI-S‘LOI/K {cu/Mains Untyan claw??? FWCPSS' m3) ?fg gs ore taxman/is Caught/UL Pa : F. :7 [35(0; (3 ml: __, (rum, 5;...) (3:345) RT. (0.340‘5%§5(§3%6¥Q a» M‘ ' ma: Wit MM; 70.9w + 0.: : 0-16m (Am : Ma Q 90 c o it VJ - mgr... M4: 14.4, (95.10333. $3423 : (04b!) (A'Mo‘ywu‘ pita—H1 gab; : l§\ {rick-H? . E11) “m - t - . . «S‘JIos‘is'rsa-R} ‘ l- (9 Fun 7 W ' Q (STU M :- Ig- fl “3 r a ' q— ? ‘ (if ____fi___________.___,.______,/ MEEN 227 — Fall 2006, Exam 1 Name So 4 a fig ID No. 4. A cylinder fitted with a frictionless piston contains R-l34a at 20 °C and 400 kPa, at which point the volume is 10 L. The external force on the piston is now varied in such a manner that the R—l34a Slowly changes in a polytropic process to 900 kPa, 40°C. A. Calculate the work in k] and Show it with the correct Sign by our convention. (18 pts) B. Is the work done on or by the system? (2 pts) 01) 3334a l _. V 3 Pl: LlOO kpa m- ——r 0.010”: "‘ V 0.0339; "4% l‘ .: 30°C ; W)..— 18 . “‘1’ V. = 'DL‘: 3,010 m3 (Talk 4'13) S 28? W0 k} V. = 0-0513? “SM (PmCess T - Mali 1 WE W“: . (R V." = E v,“ Pa: 300 kl’oe .Axp;+ngn17‘=,£m’g “flirt-Va. ‘3 =— :0 °C m3 Mimi/7414K) r in (Hi/at) a: — .0233? A? (Tdé 44$ n .— 191403110, 1 : my: = 0‘33?“ 9‘88 filo—‘3)(0. 023235 I” (V’A’Q -' ‘l' 30 8 uc/cfs’m3 :21 fl = 1M $747» M4 : “av; - “P. v, MOIDZEWWB ...
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This note was uploaded on 03/30/2008 for the course MEEN 227 taught by Professor Notsure during the Spring '06 term at Texas A&M.

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