102A Practice Midterm 2

# 102A Practice Midterm 2 - 1 (K) was removed from an oven...

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Midterm #2 102 A Closed Books and Closed Notes Nov 26, 2007 1. Give detail definitions (10 points) Entropy Reversible and irreversible process 2 nd Law 2. Estimate the maximum shaft work for a closed system undergoing an isothermal constant pressure and 2) an isothermal constant volume process. (Setting up balance equations are required) (10 points)

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3. A thermoelectric device (you can consider it as an ideal heat engine) is operated under steady state between a heat source at temperature 800 K and a heat sink at temperature 300 K. Setup the balance equations and estimate the maximum efficiency. (20 points)
4. A metal bar initially at temperature T

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Unformatted text preview: 1 (K) was removed from an oven and immersed into a closed tank containing M kg of water at temperature T 2 (K). The specific heat capacity for metal and water is C metal and C water (J/mol-K). Calculate the amount of entropy generated. (30 points) 5. In a steady state flow process, 1 mol/s of air at 600 K and 1 atm is continuously mixed with 2 mol/s of air at 450 K and 1 atm in a thermally conductive tank. The product stream is at 400 K and 1 atm. Assume the air is an ideal gas with Cp = 7/2 R, where R is the ideal gas constant. The surrounding temperature is 300K. Calculate the rate of entropy generation for the process. (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 2 - 1 (K) was removed from an oven...

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