exam1_2006 - ENGRD 221 Thermodynamics(Prof N Zabaras Prelim...

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ENGRD 221 –Thermodynamics (Prof. N. Zabaras) Prelim I 10/12/2006 Page 1 of 11 Thursday October 12, 7:30 pm – 9:30 pm Closed books and notes. 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 (15 points) Multiple choice questions. Answer all questions – explanations are not needed and will not be graded, only provide your answer. (1) (3 points) A 2 kW electric resistance heater submerged in 5-kg water is turned on and kept on for 10 minutes. During the process, 300 kJ of heat is lost from the water. Assuming the specific heat of water to be 4.18 kJ/kg. o C, the temperature rise of the water is (a) 0.4 o C (b) 43.1 o C (c) 57.4 o C (d) 71.8 o C (e) 180.0 o C (2) (3 points) An ideal gas process for which P v k = constant, where k=c p /c v is an (select the correct answer or answers)
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  • Spring '08
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