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exam211EML3100sp05_2UP

exam211EML3100sp05_2UP - EML3100 Exam 2.1.1 Name Soludtoﬂ...

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Unformatted text preview: EML3100, Exam 2.1.1 3/2/05 Name Soludtoﬂ l. Heat transfer is negative when (a) heat is transferred to a system heat is transferred from a system (c) not enough information is given to determine this answer. 2. Work is positive when @ it is done by a system (b) it is done on a system (c) not enough information is given to determine this answer. 3. For each of the following work equations, write the process to which it applies. (a) 1W2 :plylln% (a) ‘PKJ ‘7 w‘t’lb‘e" l (b) 1W2 : 172 V2 ‘171 V1 (b) g? V H 3: {12334113417 l—n (c) ,W2=p(V2—V.> (c) “PA «a wwaf 4. Complete the following table of the intensive thermodynamic state properties, lProperly Symbol SI Units . Temperature T °C or K .’ . Pressure P Pa, kPa, or MPa Spar. that 1w Mme. ‘ - (Eugenio) V X 7- 330815115X}. if} rig (wall «'14 if"??? 3‘ M ’. Speciﬁc‘ @rﬁﬁrffnﬂ page 1 of 8 EML3100, Exam 2.1.1 3/2/05 (9;? 5. Calculate the change in enthalpy (in k]) when 3 kg steel horseshoe is heated from 27°C to 527°C. (V AH =1 ‘W‘tﬁ-A :‘ m6? bl“ Width #721 "M if) Vi m=3k5 _. “\x C?eD.500 \$7; 6:3) ,1 “1'52th . T‘lzsz’JQ '< T’ , g: a 9 .. 0‘, ... W” AH- :(gks D‘EDO kaﬁZZ-ﬁ La 2 1’ k-jl i2“: qaoml f0 6. Calculate the change in speciﬁc internal energy (in kJ/kg) when the ideal gas carbon monoxide 21y (C0) is heated from 177°C to 1487°C. 'ﬁ :177’c+2?5 =45D K T3?" 14.43:,“ch +W:":«LE:‘~I .r: [400K Mica‘a-‘ZQIN‘. E313“ A" use; @ M" ﬁ‘mﬁﬁgve IBIW “mm KZ=R360 : 591E662 gwiu A 2; , ’ .L. f' Ahw \$32? 3: M {F- i’3!) (grass \$443” .a w A“ = 436140 W6 page 2 of 8 iEML3100, Exam 2.1.] 3/2/05 lEML3100, Exam 2.1.1 3/2/05 W7. A piston-cylinder assembly contains 20 kg of superheated water vapor (steam), initially at 150°C and occupying a volume of 12.678 m3. The steam is compressed to 2.5 MPa in a process such that PV remains constant. é (21) Draw a picture of the initial and ﬁnal states, and write the given information under each. pr (b) L What is the initial speciﬁc volume? 2a)») What is the initial pressure? q/(dy What is the initial speciﬁc internal energy? 6 (e) What is the ﬁnal voltune‘? 9 (f) What is the ﬁnal speciﬁc volume? 4, (g) L What is the ﬁnal temperature? What is the ﬁnal speciﬁc internal energy? What is the work (in kJ) for this process? ' What is the heat transfer (in kJ) for this process? Show all work, and specify tables used! Do not assume ideal gas behavior. DO NOT WRITE ABOVE THIS LINE! ?\lrco~n\$+ s+ea m iii WPEM fﬂ 5H ‘09? m W20 ‘55} T“ 130% , ‘ \lL =l2.(ﬁ6 m3 ? =25M?“ 0") U2: U)? 4" xtﬁu‘ﬂﬂ ”“43 0mm? >~ “" Wm Vex}: (o. enemas?" 2,0. M ,, 4.0 9503 x; H 3 I 3"- ‘ g i __. WM- ....... ; rm..." —-——--—-——-—'T'§T .. lzggwi: :: O~M7333 m 3:9} (X22 3&3va (0 ”0—4398? 3 "O Doug-WED? ) [N L . w T: L559, ?= 0.30 MP4s @ Q51; 959'“ L33 u - 26003.. l—— a) also tramwu ”Ta“ 2520.5?— ” 3 —5 = (959. ll ,} 4 (0. 950312603.\ LAW 2521.4??3 Wit” page 3 of 8 SPH page 4 of 8 1EML3100, Exam 2.1.1 3/2/05 lEML3100, Exam 2.1.1 3/2/05 7- “”11 "1- (w )3. 5 kg/s of superheated vapor Refrigerant-134a (R—134a) enters a compressor at 0.2 MPa, 10°C, V at 15 m/s‘ Superheated vapor R-l34a exits the compressor at 0.8 MPa, 120°C, 100 m/S. (L) W r. “at," L:— 1 Z V] If (a) Draw a schematic of this device. Write your assumptions 2 l m3 3 M an Write the pertinent info for each inlet and outlet ﬂow. Be sure to list tables used. «A» , ‘ 3’ . \ ICE; *m EM. What is the power input/output for this compressor (in kW)" 4549mm MR Mtge to“ m - 1“ (d) What is the cross-sectional area of the exit pipe (in c1112)? Show all work, and specify tables used! Do NOT WRITE ABOVE THIS LINE! H§umphie~ns ("Q = o 55\$F nip-m Fm tin APE :{3 no elem“ cm into page 5 of8 page 6 of 8 EEML3100, Exam 2.1.1 3/2/05 3. cont'd. n W ; KQSS'BBEE — 358.40%); Ji{{15%)z-(!OD%V§ -522 55% {cf «“12? ...
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exam211EML3100sp05_2UP - EML3100 Exam 2.1.1 Name Soludtoﬂ...

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