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S12-test1

# S12-test1 - MAEZSI Test 1 Spring 2012 Closed book — time...

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Unformatted text preview: MAEZSI Test 1 Spring 2012 Closed book — time: 55 min — grading: 5+5+10 Remember to solve the problems symbolicalbtﬁrst: method! Also remember that there will be very little partial credit for execution errors (signs, numbers, units, etc.) Please mark in the tables the values you use, and return the exam inside your blue book. For interpolations, Show the details of procedure in question 1, then you can approximate judiciously to save time. CD 0 Deﬁne the words ‘adiabatic’ and ‘polytropic’ 0 Name and deﬁne one material property that not deﬁned in two—phase mixtures, and one that is not deﬁned in single-phase. 0 Write the most general form of the ﬁrst law of thermodynamics for closed systems 0 On a T—v diagram, sketch (reasonably precisely) and label the saturation line and a typical subcritical isobar 0 Using the tables for water, calculate the enthalpy of water at 10psi and 413°F. @ A unit mass of a substance undergoes a cycle in a piston-cylinder system. The cycle consists of 3 processes: constant pressure from p1, v1, to vz = 3.v1, then a linear variation p(v) to p3 = 3.p1, then constant volume. Sketch the cycle on a p-V diagram. Evaluate the work for each process in terms of p I and v1. Explain whether this is (or not) a power cycle. (9 One pound of water is compressed in a piston/cylinder system. The process follows the relation p.v0'8 = C. At the initial state, pressure is 14.7 psi and T : 250°F. Compression ends at 100 psi. Sketch this process on a p—v diagram, and calculate the heat transfer. Conversion factors: 1 bar: 100 kPa 1 Btu = 7781bf.ﬁ 1 psi = l lbf/in2 gc = 32.21bm.ft/1bf.s2 K=°C+273 GR =°F+460 0 C» -.~ 0 _ 1.37. - 2Y0.S' ._ W 41.. t1‘fo5—r .ts ﬁll: __ . Haaﬁeﬁm 'DO . U. a ' 3 (up r‘bﬁjEKaw: Mi}.qu LANA CL II». w - . a.» 1 - u- } J". "A . wwxz~ U‘ 2 ‘ ' AW I c, ‘ u.) CC 9 ‘ I p 3 0 1-] ' 1: 23.5% - 7-53 ‘4) 2" I “ W . ‘ up I. : W‘"'0 ::.S “loans 2 H3~1_ . :- -Q" .... HOSE—2%.} , . 2.3 K £793"! A [4‘4 gHLﬂ Tables in English Units 941 TAB'IJ'E' A535. 859.129[FleaPféatwatsémmi.£ki.9¥.i9r¥19993.023%? \$1.12!? ..................................................................................................... .. Specific Volume internal Energy Enthalpy Entropy ft3/lh Btu/lb Btuflb Btu/lb - °R Sat. Sat. Sat. Sat. Sat. Sat. Sat. Sat. ' ‘ Liquid Evap. Vapor Liquid Evap. Vapor 120 341.30 0.01789 3.730 312.3 1108.3 312.7 878.5 1191.1 0.4920 1.0966 1.5886 120 130 347.37 0.01796 3.457 318.6 1109.4 319.0 873.5 1192.5 0.4999 1.0822 1.5821 130 140 353.08 0.01802 3.221 324.6 1110.3 325.1 868.7 1193.8 0.5073 1.0688 1.5761 140 150 358.48 0.01809 3.016 330.2 1111.2 330.8 864.2 1194.9 0.5142 1.0562 1.5704 150 160 363.60 0.01815 2.836 335.6 1112.0 336.2 859.3 1196.0 0.5208 1.0443 1.5651 160 .°R 1333-7 1373.8 1414.7 p = 10° [bflin'z . . ........;.;.;;;.ii;;;i.;:;unu................. 0 o ) ...
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S12-test1 - MAEZSI Test 1 Spring 2012 Closed book — time...

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