Test2_SAMPLE

# Test2_SAMPLE - Name Page 1 ME 3720B Intro Fluid Thermo Eng...

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Name: ___________________________ Page 1 ME 3720B Intro Fluid Thermo Eng – Spring 2008 SAMPLE Test #2 (50 minutes, open textbook only) You do not need to follow any specific procedure. Use a hand-held calculator. Problem 1. (60 pts) Use margins to write down your derivations clearly. Problems (i) and (ii) are based on the following: Steam enters a nozzle operating at steady state with 1 p = 30 bar and 1 T = 300 ° C, with a velocity 1 V = 100 m/s. The exit pressure and temperature are 10 bar and 200 ° C, respectively. Neglect heat transfer and the change in potential energy. (i) (10 pt) Determine the exit velocity of the steam. Answer: _____________ [m/s] . (ii) (10 pt) Find the entropy generation per unit mass flow. Answer: ___________ [kJ/kg K]. Problems (iii) and (iv) are based on the following: 10 kg of water in a frictionless piston-cylinder assembly is condensed isothermally from saturated vapor to saturated liquid at 100 ° C. This process may be modeled as an internally reversible process, while heat is being transferred to ambient air at 25 ° C irreversibly.

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Test2_SAMPLE - Name Page 1 ME 3720B Intro Fluid Thermo Eng...

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