ME200_Exam3_Solution

ME200_Exam3_Solution - First Name Solution Last Name CIRCLE...

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1 First Name Solution Last Name CIRCLE YOUR LECTURE BELOW: 7:30 a.m. 8:30 a.m. 10:30 a.m. 1:30 p.m. 3:30 p.m. Mongia Abraham Sojka Bae Naik ME 200 Exam 3 November 16, 2011 8:00 p.m. to 9:00 p.m. INSTRUCTIONS 1. This is a closed book examination. You are provided with an equation sheet and all needed property tables are provided. 2. Do not hesitate to ask the instructor if you do not understand a problem statement. 3. Start each problem on the same page as the problem statement. Write on only one side of the page. Materials on the back side of the page will not be graded. There are blank pages following problems 2 and 3 for your work. 4. Put only one problem on a page. Another problem on the same page will not be graded. 5. Label your system and list relevant assumptions for problems 2 and 3. 6. If you give multiple solutions, you will receive only a partial credit although one of the solutions might be correct. Delete the solution you do not want graded. 7. For your own benefit, please write clearly and legibly. Maximum credit for each problem is indicated below. 8. After you have completed the exam, at your seat put your papers in order . This may mean that you have to remove the staple and re-staple. Do not turn in loose pages . 9. Once time is called you will have three minutes to turn in your exam. Points will be subtracted for exams turned in after these three minutes. Problem Possible Score 1 30 2 35 3 35 Total 100
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2 First Name Solution Last Name Problem 1 (30 points) Show all work to receive credit. (a) A refrigerator with two compartments removes heat at the rate of 1000 kW from one compartment at -23 C and at the rate of 1400 kW from another compartment at 7 C; 300 kW of power input is required to operate the refrigerator. The refrigerator rejects heat to the ambient reservoir at 27 C. Draw a sketch of the refrigerator showing all heat and work interactions. Determine whether the refrigerator is reversible, irreversible, or impossible. (20 points) The heat and work interactions of the refrigerator are shown below: Applying energy balance to the refrigerator: 312 2700 kW   QQ QW 1000 kW 1400 kW 2700 kW kW 0 250 K 280 K 300 K K      refrigerator Q T
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ME200_Exam3_Solution - First Name Solution Last Name CIRCLE...

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