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Unformatted text preview: University of Arizona
Engrl11 K: Thermodynamics
Final Exam ‘Timelhours
Name [kl/h I Qng [1] A vapor—liquid mixture of water at 90'(' has a speciﬁc voiume of 05m" 1kg.
Determine the quaﬁty of the mixture, the enthalpy and entropy. [10 pts] thaw wmcm V2775“
h "I. g —\( L  ‘ 006; k. v En 1'? \n 03 9 7/ h ’ "UL *— ’0“er h : Maw (191‘) @2331? h : ﬁSbJV “cl/U [2] me temperature and the pressure of air changes from 27‘C and 1.2 aim
to l77‘('and 5.2 atm in a process. Calcuate the change in entropy. [15 pts] *2 , T c . x v)
if gout As, cpkn ,‘Mmgﬂ Cp A31
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(1: “Jam 13; : 2002>OL1 7 .151 p \éw V’ “x' L J v [3] Find approximate values for the ptoperties (speciﬁc volume, intemal energy,
enthalpy and entropy of water at 47.5’C and ISOkPa. [15 pts] 95¢ L 1‘30 (FR VLL‘SN“; ' V1 HS” _ V  V: H5) LM‘mem WINK .\/=
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E) _ _]° g2 ; in $75.7 [4] a) Defne the oonpressed liquid states. smemeated vapor states. (5pts)
b) Deﬁne the saturated liquid line. saturated vapor line and cn'ﬁcal point
Locate them on the TV diaphragm. (5pts) Or C0Mpfcs§£d \{cxwdy I (107 Sth; “‘3' pres’Swu. {S (5((03(r *"lmm W Smhwcdr'ion (3R; W“ air ’HVLR. hmpzraJu/u
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“mi A’WO 9km 'Ia’u,c‘xVa.pcr donut. [5] For an isentropic process of an ideal gas (k=1.40), with an initial absolute
pressure of 50 kPa. an initial speciﬁc volume of 7.5 mall), and a final
pressure of 130 kPa. Find the ﬁnal value of the speciﬁc volume? [15 pts] A510 V‘s: \‘q PV K _A_ C O‘NE‘JV l. 1
Q ‘ t \I" I [6] What is entropy? Deﬁne itwith example. (5 points)
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v [7] A closed system initially at rest on the surface of the earth undergoes a
prom for which there is a net energy transfer to the system by work of
magnitude 200k! ‘ During the process there is a net transfer of energy from
the system to its surroundings of3OIrJ . At the end of the process. the system
has a veloa'ty of wm/s at an elevation of60m. The mass of the system is 25kg, and the local acceleration of gravity is g :9,75m/s3. Determine the
change of rntemal energy of the system for the process. [15 pts] 46%., 4 Q'LL“ : ALI» L, are 2 APE
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Crycﬁgv‘b 10100 : ALL 'r 4K5 "AH:
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I, ): 56¢: 1‘ Q A UV : G“ LU ‘ A K E ’ V \ i‘ I IZ‘J‘L‘UL EAL: — +7.00 ' (0' [7.3" \«1 /' w
A, [8] A open feed water in a vapor power plant operates at steady state with liquid
entering at inlet 1 with TI = 40"(.‘ and P, = 700kPa . Water vapor at T, 120017 and P2 =700kPa enter at inlet 2. Saturated iquid water exits
with a pressure of P,  700kl’a at outlet 3. Ignoring heat transfer with the surroundings and all kinetic and potential energy effects, determine the ratio
ofmassﬂow rates, "'1, 1/51,. [15 pts] m (h ~ (h \ l"w \ dirt“)? 1 : Mural“
m “V1. 'r r“ — [mﬂlmzlhl Y\\l"h3 m I \____4 m (\yh‘
7 Lrll~l ’7 r) . ,
Qﬁ ' rm 2 84°lt7~""’7.3‘l
J m1. MIW—lblﬂ V'r‘Lllmmf'f'kt"; —’ [£01734 K) m.
~‘ =5” : L‘l .057 ...
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 Thermodynamics, pts, Miami, University of Arizona, specific volume

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