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Me 235 Practice Exam2

# Me 235 Practice Exam2 - ME 235 EXAM I C BORGNAKKE ME Dept...

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ME 235 EXAM I , Oct 12, 2005 C. BORGNAKKE ME Dept. 1. [30 points] Determine the phase of the following substances and find the values of the unknown quantities. (a) Water, P = 300 kPa, T = 30°C, v = ?, u = ? (b) Neon, T = 500 K, P = 500 kPa, v = ? (c) R-12, T = 30°C, v = 0.1 m 3 /kg, P = ?, u = ? (d) Ammonia, P = 100 kPa, u = 1400 kJ/kg, T = ?, v = ? 2. [40 points] I have two rigid tanks filled with water. Tank A is 0.2 m 3 at 100 kPa, 150°C and tank B is 0.3 m 3 at 300 kPa saturated vapor. The tanks are connected by a pipe with a closed valve. We now open the valve and let all the water come to a single uniform state while we transfer enough heat to have a final pressure of 300 kPa. (a) Find the mass of water in each tank at the beginning. (b) Give the two properties that determines the final state. (c) Find the heat transfer needed. 3. [30 points] Air in a piston cylinder is at 90 kPa, 17°C with a volume of 0.001 m 3 . It is now compressed to a volume 10 times smaller in a polytropic process with n = 1.4 with no heat transfer.

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