Practice-Exams---1_13046

Practice-Exams---1_13046 - CHEN 204 Fall 2010 Practice Exam...

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CHEN 204 Fall 2010 Practice Exam 1 1. You purchase a thermocouple with markings between 0 and 100. A calibration plot for the thermocouple is available from the manufacturer and is a straight line in logarithmic coordinates. The line passes through the points (G 1 = 20, T 1 = 110) and (G 2 = 40, T 2 = 250), where G is the thermocouple reading and T is the temperature in K. (a) Derive an equation for T (K) in terms of the thermocouple reading G. (b) Without doing any calculations, briefly justify whether you will have confidence in a temperature reading of 325K or 165K. 2. The absolute pressure of a gas P is related to its volume, and temperature by the ideal gas equation PV = 0.08206 nT . (a) If n is in moles, P is in atm, T is in K, and V is in L, what are the units of 0.08206? (b) In an experiment, you measure the pressure of a gas mixture using a Bourdon gauge . If the tank volume V is in ft 3 , the temperature T is in o F, and n is in lbmoles, express the ideal gas equation of state in terms of the new units. (c) A gas mixture containing 65 mole% O 2 and 35 mole% CO 2 is stored in a 3.5 ft 3 tank. The tank contents are at 95

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This note was uploaded on 12/12/2010 for the course CHEN 204 taught by Professor Staff during the Fall '08 term at Texas A&M.

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Practice-Exams---1_13046 - CHEN 204 Fall 2010 Practice Exam...

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