ECE309 Midterm: ece309s04q
31 Jan 2019
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Read the questions very carefully: clearly state all assumptions, it is your responsibility to write clearly and legibly. Initially saturated water at 200 c is contained in a piston-cylinder device as shown below. Air at 40 c and 0. 6 m p a enters a 25 mm diameter pipeline at a mass ow rate of 0. 01 kg/s. The air ows through several valves and leaves the pipeline at a pressure of 110 kp a. Air is contained in a rigid, adiabatic 0. 3 m3 container at 20 c and 101. 325 kp a. A paddle wheel sticking into the container then does 50 kj of work. One kilogram of superheated water vapour (steam) at 700 c and 2. 0 m p a is contained in an ejection tube behind a 50 kg projectile that is initially held in place by a pin. The pin is then removed and the vapour pushes the projectile forward into the reference atmosphere at tatm =
