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Unformatted text preview: l. (30%) Define or describe the following terms with a single phrase or expression. 3 ~ a. isothermal process
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} b. constant volume speciﬁc heat (mathematical deﬁnitim)
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Z (i J; 8% @‘ffW/i/Agyg‘éemwx aw fﬂéﬂfﬁi‘ﬁiﬁ e. The right side of tile vapor dome on a PV diagram represents What state}?
for in M 74963] Wiper
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[4 For t. What IS the ﬁrsng pressure at the bottom of a swimming pool that is deep
i)? F /aoa/—<2— 751": /<7M +3; Agw'd= M 273/{63F5‘H 1%
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‘2— g. What is the Quality tthennodynamie property) at" the water coming out of a W
drinking fountain?
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tats) h. The constant pregng specific heat ofcm'bon monoxide gas at 400 K is Cp 2
1.047 kJ/kg K. What is the Value ot‘its constant Spitting specific heat. CV {kl/kg K) at the same
temperature? K
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Y 25///7L; jams) l. A balloon tilled with argon :11; an initial temperature afﬁrl‘lt‘ tifb’tﬂl in ice—water
until the temperature ot‘thc argon «comes into thermal :quitihrium wl:h the leerwater at 0°C.
What is the change in specie internal energy of the argon on a molar basis th/kmole)? Mama; : Cx/ CV (Z r ‘t ’7
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Be neat, write out equations before inserting numbers, and gjrcle your answers. If you cannot ﬁgure out one part. assume an arswer and carry it through the other parts. 2. (45%) A cylinder ﬁtted With two insulated frictionless pistons is shown below~ The
volume below the bottom piston contains water and the Volume between the two pistons contains
nitrogen gas (N2). A shaft initially pushes down on the top piston exerting force that is
measured to be 400 lﬂbf‘. Both pistons have diameters ot‘ti inches. The initial volumes ofthc N2
and water are 025 ﬁ’ and 0.6 ft}, respt’3ctively. T he mass of the water is 0.1 me. The initial
temperature of the N3 is 90017. The force exerted by the shaft, on the top piston is increased to 600
lbf, compressing the ﬂuids. The N; is Joulpieﬁﬁd in a polyzropic primes where the pslytropic
exponent n = 1.3!. 'Phewtemperatuz . ‘ ' ‘ ‘ ' ' l‘ I .
1k ' fihl )9 'Tﬁfﬂw‘a l9 Cling; {ll‘ll’iﬂsrllttl‘iii pressur: is l 1.7 psia. 7"
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’ H a Find the roinrie (tithe X3. " Find the ﬁnal ressure of‘tlt: water I’mi 3. — 7L
ﬁg) . p . W 07’)
d What is the work done by "he shat": ( ft ilk)? A M 9 Q Qualitativer {no mfml‘ rs) sketch the I“ ’ diagrams for bath fire N2 and the water
and label the end points. Show taper chimes where applicable. ) 1/ @1469 Mac
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’41? : 250'? g/ Problem 2 continued WW: ,I? i? *1 W (/1 W 35. WWW) ~ 25/. m/Mj‘zs /“M 3. (24%) ‘Two kilograms of refrigerant R134a is container] in a sealed box with ﬁxed
volume 0.3 m’. The refrigerant is heated from —240C until the pressure is WkPaﬂjNhnt is the
initial pressure of the Rt34a (szi)? / 9’0 5 a) What is the ﬁnal temperature (il‘the R l 34a (0? C B’) At the initial state. what is the mass oft{l 34st in the vapm' phase (kg)? 0? 6’) What is the total change in enthalpy 0fthe R134a (kl)? g (D Qualitative‘ty sketch the precess on 5;; FltV diagram. Be sure tu Show the vapor dome and
label States One and two. Z
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This note was uploaded on 01/27/2012 for the course ME 326 taught by Professor Schmidt during the Fall '07 term at University of Texas.
 Fall '07
 Schmidt

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