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Test1_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 #1 (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 any derivations if you wish. (i) (10 pt) A 0.05 kg marble is dropped from the top of a building of 10 m height. What is the kinetic energy of the marble when it hits the ground? Answer: ___________________ [kJ] . (ii) (10 pt) A closed system of mass 5 kg undergoes a process with heat and work interactions. An amount of 250 kJ of heat is transferred from the system to the surroundings. The work done on the system (i.e., the system receives work) is 175 kJ. The initial specific internal energy is 350 kJ/kg. What is the final specific internal energy? Answer: ________________ [ ] . (iii) (10 pt) A power plant receives energy by heat transfer from a combustion fuel at a rate of 300 MW (1 MW = 10 6 W). The thermal efficiency of the cycle is 33.3%. Determine the output power, i.e., the rate of work generated. Answer: _______________ [ ] .
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Name: ___________________________ Page 2 (iv) (10 pt) Oxygen is contained in a tank whose volume is 3 0.042 m V = at 21
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