Test 1 Solutions - Fundamentals of Thermodynamics - Fall 2000 | ME 3134, Exams of Thermodynamics

Download Test 1 Solutions - Fundamentals of Thermodynamics - Fall 2000 | ME 3134 and more Exams Thermodynamics in PDF only on Docsity! ME 3134--Test 1 Name: EFB/Fall ‘00 Section: Reem, one) This is a closed book test. I pledge that this work is my own a received any unauthorized aid on this te PROBLEMS: Show your work clearly. aflure to wok’ clearly may limit the amount of partial credit you receive. Ls (40) One-half cubic meter of air is contained in a stationary piston and cylinder (constant pressure) device. The initial pressure and temperature are 300 kPa and 30°C. Heat is added until the temperature reaches 400°C. Assume the air to behave as an ideal gas. Use C,= 1.005 kJ/kg/K, Cy = 0.718 kd/kg-K, and R = 0.287 kd/kg/K. (a) Draw a P-v diagram which illustrates this process. Clearly label the initial and final states. a : . © ice a) ze Te 400 <1: OT Vv (b) What is the mass of the air in the cylinder? V= 0-50? Pp= rt ve &/ Fev)= Teo B15 me 2 Y- BYY “Crpaken (05) * & = RT” (0.28 TK) (303-15K) P 2 |.724 kg ie ig (c) What is amount of moving boundary work done? pew w= $2 PAY meen Pearle w= Pi rav go Vor BR mw |>wm 5 oo W=P [yy ; y,-7) = E(t -t) 2 PER WwW ff [Fl T)| —» Wewm= mR (te-T) 1O3.\ xs = CL-72418 6-985 fey) (208) (d) What is the amount of the heat a oO o . Pa Q-W= Aver sve Ape Wn) DN 8S MISHARY Q= AL+W : > W — Q re pi OM-| ks Q =@.11% By TING) (FO) + 108. | (30) Steam flows steadily through a turbine at a rate of 10 kg/s. Steam enters the turbine at a pressure of 500 kPa and a temperature of 300°C and leaves as a saturated vapor at a temperature of 100°C. Heat is lost in the amount of of 100 kd/kg. (a) Draw a T-v diagram which illustrates this process. Clearly show the location of the inlet and exit states relative to the position of the vapor done. m= lols R= pete Ts 200°C Seene woliee +. Te 2 00° § Vapor qe 100 '5 | kay