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301 Quiz_1_Solution

301 Quiz_1_Solution - SOLUTIONS MAE 301 Engineering...

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SOLUTIONS 1 MAE 301: Engineering Thermodynamics I Spring 2010 Quiz 1 Feb 2, 2010 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 1. Electric heater is outside the system. Energy is transferred by heat kJ kJ kJ U Q W W Q U 300 900 600 = = Δ = = Δ 2. Electric heater is inside the system. Energy is transferred by work arbitrary is W arbitrary is Q kJ kJ kJ W Q if U Q W W Q U = = = Δ = = Δ 900 900 0 0 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
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