# exam2 - ENGRD 221 Prof. N. Zabaras Prelim II 11/15/2007...

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ENGRD 221 –Prof. N. Zabaras Prelim II 11/15/2007 Page 1 of 5 Thursday November 15, 7:30 pm – 9:30 pm Closed books and notes. The notation is all problems is the one used in class and further explanations are not needed. Answer all questions. Make sure your answers are legible. The TAs and instructor will not respond to any questions during the exam. If you think that something is wrong with one of the problems below, please state your concern in your exam books. Problem 1 (15 points) Answer each question carefully providing all necessary details. 1. (3 points) For the following combined form of the first and second laws of thermodynamics, dG=-SdT+VdP, write down the corresponding Maxwell equation as well as the two coefficient relations. 2. (5 point) Use the methodology of your choice to compute an expression for T V U ⎛⎞ ⎜⎟ ⎝⎠ in terms of T, P, α and β . 3. (5 points) From Eqs. C P = ( h/ T) P = T ( s/ T) P and C v = ( u/ T) v = T ( s/ T) v and the knowledge that Cp > Cv what can you conclude about the slopes of constant v and constant P curves in a T-s diagram? (i.e. which one is bigger?) Notice that we are looking at the curves T(s) with P or v given. 4. (2 points) The Clapeyron equation discussed in the lectures is used to: a) compute the entropy change in polytropic processes b) determine the enthalpy change associated with phase change c) derive the Maxwell equations d) compute the relation between the specific heats C v and C p e)

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## This note was uploaded on 07/09/2009 for the course M&AE 326 taught by Professor Psiaki during the Spring '08 term at Cornell University (Engineering School).

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exam2 - ENGRD 221 Prof. N. Zabaras Prelim II 11/15/2007...

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