102A Practice Midterm 1

102A Practice Midterm 1 - temperature of the gas in the...

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Eng 102 A Midterm #1 (Thursday, Nov 8, 2007) Closed Books Closed Notes 1. Define the follow concepts (20 points): System, surrounding, open system, closed system, isolated system, adiabatic system Internal energy, external energy, heat, work Intensive variables & extensive variables Ideal gas, Cp, Cv
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2. A turbine expand steam with high temperature and pressure to low temperature and pressure. 1) Setup the mass balance and energy balance and 2) estimate the maximum work the turbine may be generated. (20 points)
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3. A cylinder contains 1 m 3 gas at 10 bar and 300 K. The valve of the cylinder was opened to the pressure was dropped to the atmosphere pressure. Estimate the mass and
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Unformatted text preview: temperature of the gas in the cylinder after the process is accomplished. You can assume the gas is an ideal gas with Cp = 29 J/mol K. (Hint: you may release gas slowly or fast). (30 points) 4. Air at 1 bar and 298 K is compressed to 5 bar and 298 K by two different mechanically reversible process: (a) cooling at constant pressure followed by hearting at constant volume and (b) heating at constant volume followed by cooling at constant pressure. Calculate the heat and work requirements, internal energy change, and enthalpy change for each path. Cv= 20.78 J/mol K, molar volume of air at 298K and 1 bar is 0.02479 m 3 /mol-1 . (30 points)...
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This note was uploaded on 03/29/2009 for the course CHE 102A taught by Professor Orkoulas during the Winter '07 term at UCLA.

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102A Practice Midterm 1 - temperature of the gas in the...

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