EX2f03 - ME 235 EXAM 2, NOVEMBER 20, 2003 A. ATREYA and C....

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ME 235 EXAM 2, NOVEMBER 20, 2003 A. ATREYA and C. BORGNAKKE, ME Problem 1 (25 Points) A 5 kg granite rock was placed over a fire and warms to 200 o C. A pot (neglect mass) with cold water at 15 o C is now placed on top of the rock piece and it should be brought to the boiling T. Assume the fire is put out and we have no external heat transfer. a) What is the mass of water I can have in the pot? b) Find the entropy generation in the overall process. Problem 2 (35 Points) A piston/cylinder device has 0.01 kg of saturated liquid ammonia at 0 o C. It is now expanded in a reversible constant pressure process to a final state of quality 50%. The heat transfer is from a Carnot cycle device with the other side connected to the ambient at 25 o C. a) Find the total heat transfer to the ammonia. b) Find the work the ammonia gives out. c) Find the work to/from the Carnot cycle device d) Find the total entropy generation in the process. Problem 3 (40 Points)
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This note was uploaded on 05/05/2008 for the course ME 235 taught by Professor Borgnakke during the Winter '07 term at University of Michigan.

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EX2f03 - ME 235 EXAM 2, NOVEMBER 20, 2003 A. ATREYA and C....

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