301 Quiz_1

301 Quiz_1 - (a) 0 (b) A (c) - A (d) - B (e) none of these...

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Name__________________________________________ 1 MAE 301: Engineering Thermodynamics I Spring 2010 Quiz 1 Feb 2, 2010 (Total 100 points, closed books and closed notes) 1. (20 points). A closed thermodynamic system is heated by an electric heater with a power of 1 kW for 10 min. During this process, the internal energy of the system is increased by 900 kJ. The work performed by the systems during this process is (a) 300 kJ (b) -300 kJ (c) 0 kJ (d) 900 kJ (e) none of these 2. A closed system undergoes quasi-equilibrium cycle 1-2-3-4-1 shown in P-V diagram below. The area inside the cycle is A and the area under the curve 1-2-3 is B. (10 points). The change of the internal energy during the cycle is (a) 0 (b) A (c) B (d) A+B (e) none of these (10 points). The amount of energy transferred by heat during the cycle is (a) 0 (b) A (c) - A (d) A+B (e) none of these (10 points). The amount of energy transferred by work during the cycle is
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Unformatted text preview: (a) 0 (b) A (c) - A (d) - B (e) none of these P V 1 2 3 4 A B Name__________________________________________ 2 3. Consider two portable electricity generators with output electric power of 10 kW. Each portable generator consists of a diesel engine and electric generator. The first generator has a diesel engine efficiency of 0.4 and an electric generator efficiency of 0.8. The second generator has a diesel engine efficiency of 0.3 and electric generator efficiency of 0.95. Compare the overall electricity generation efficiencies of the systems and the rates of heat dissipation to the environment. (a) 2 1 < (b) 2 1 > (c) 2 1 = (15 points) (b) 2 1 Q Q & & < (b) 2 1 Q Q & & > (c) 2 1 Q Q & & = (15 points) 4. (20 points). An ideal nozzle is designed to produce output velocity of 100 m/s. What will be the approximate output velocity for 80% efficient nozzle? (a) 89 m/s (b) 64 m/s (c) 80 m/s (d) none of these...
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301 Quiz_1 - (a) 0 (b) A (c) - A (d) - B (e) none of these...

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