ME 3310 Midterm: me3310test1r16
31 Jan 2019
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Open book, closed notes, show all work for partial credit. Problem 1: (4 points) somebody claims that oxygen gas at 113 c and 3000 kpa can be treated as an ideal gas with an error of less than 10 percent. Problem 2: (7 points) a rigid tank with a volume of 0. 07 m3 contains 1 kg of refrigerant 134a at 400 kpa. Determine the pressure when the refrigerant first starts condensing. Also, show the process on a p-v diagram with respect to saturation lines. Problem 4: (13 points) a mass of 5 kg of saturated liquid-vapor mixture of h2o is contained in a piston- cylinder device at 100 kpa. Initially, 2 kg of the h2o is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the h2o, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 125 kpa.
