# exam2_2006 - ENGRD 221 Thermodynamics (Prof. N. Zabaras)...

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ENGRD 221 –Thermodynamics (Prof. N. Zabaras) Prelim II 11/16/2006 Page 1 of 4 Thursday November 16, 7:30 pm – 9:30 pm Closed books and notes. You are allowed to have only whatever information fits in the two sides of the `index card’ that was given to you in class. Wireless or any other form of internet/phone connection is strongly prohibited during the exam. Answer all questions. Make sure your answers are legible. Circle your final answer. 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 (20 points) The figure shows three devices operating at steady state: a pump, a boiler, and a turbine. The turbine provides the power required to drive the pump and also supplies power to other devices. For adiabatic operation of the pump and turbine, and ignoring kinetic and potential energy effects, determine, in kJ per kg of steam flowing: a) (5 points) the work required by the pump b) (5 points) the heat transfer to the boiler c) (10 points) the net work developed by the turbine Useful data: h 1 =125.74 KJ/Kgr, v 1 =1.0043 x 10 -3 m 3 /Kgr. h 3 =2769.1 KJ/Kgr, s 3 =6.6628 KJ/Kgr K At 1 bar, s f =1.3026 KJ/Kgr K, s g =7.3594 KJ/Kgr K, h f =417.46 KJ/Kgr, h g =2675.5 KJ/Kgr.

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ENGRD 221 –Thermodynamics (Prof. N. Zabaras) Prelim II 11/16/2006 Page 2 of 4 Problem 2 (5 points)
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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_2006 - ENGRD 221 Thermodynamics (Prof. N. Zabaras)...

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