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Exam1 - ENGRD 221 Thermodynamics(Prof N Zabaras Prelim 1 Thursday October 11 7:30 pm 9:30 pm Closed books and notes Answer all questions Make sure

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ENGRD 221 –Thermodynamics (Prof. N. Zabaras) Prelim 1 10/11/2007 Page 1 of 4 Thursday October 11, 7:30 pm – 9:30 pm Closed books and notes. 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 (10 points) Multiple choice questions. Answer all questions – explanations are not needed and will not be graded, only provide your answer. (1) (2 points) An ideal gas is throttled to a lower pressure. During this process, (select the correct statement ) (a) the temperature of the gas will increase. (b) the temperature of the gas will decrease. (c) the temperature of the gas will remain constant. (d) the entropy of the gas will decrease. (e) the enthalpy of the gas will decrease. (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(s)) (a) incompressible process (b) isobaric process (c) adiabatic process (d) isentropic process (e) isothermal process (3) (2 points) When a closed system with internal irreversibilities undergoes a process from state 1 to state 2, the entropy change, S 2 – S 1 , and entropy production, σ
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Exam1 - ENGRD 221 Thermodynamics(Prof N Zabaras Prelim 1 Thursday October 11 7:30 pm 9:30 pm Closed books and notes Answer all questions Make sure

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