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test2_s05a - MAE251 Test 2 Spring 2005 Closed book —~...

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Unformatted text preview: MAE251 Test 2 Spring 2005 Closed book —~ time: 50 min — grading: 3+2+3+2+10 1. On a p—h diagram similar to this, mark and label l9 clearly the lines or regions corresponding to - a typical heat exchanger - an isotherm - an ideal gas approximation - a throttling process & 2. Write the general equation for energy balance ( lSt law for open systems), and circle the terms relevant to the analysis of nozzies 3. On a p-v diagram similar to this, mark the portions of dotted lines along which the relation dh = cl, (H is applicable; explain briefly (20 words or less). pug—an.— I l i l a. 4. Air enters a diffuser at speed VI = 1000 Pris, and exits at negligible speed. Calculate the enthalpy increase, in Btuflbm. 5. Air at p; = 40 psi, T. 2 600 0F, is throttled to p; = 30 psi, then expands adiabatically through a turbine following a polytropic process pv” = c. Calculate the turbine work; sketch and label the processes on a p-v diagram. ‘3 lb _ (q 7 . . p3 ,_ _ [m Conversion factors: 2 1 bar = 100 kPa l Btu = ??81bf.ft 1 fi = 12in gc = 32.21bm.fiflbf.s Air property values: TABLE A-ZOE Ideal Gas Specific Heats of Some CommOn Gases (Btui‘lb - oR) ...
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