Fall 10 Exam 2

# Fall 10 Exam 2 - MEEN 315Fall 2010 Exam 2 Name Section...

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MEEN 315—Fall 2010, Exam 2 Name ________________________ Section Number _______________ 1 1. Put name on every page. 2. RELAX, this is only an exam. Read over the whole exam, then decide which problem to work first. 3. Exam is closed book and notes. Tables provided by instructor. No collaboration with others! 4. Include a sketch, and clearly state assumptions and equations used on problems requiring detailed analysis. 5. If you get stuck on a problem, go to the next one. 6. Problems must be worked in the unit system in which they are specified. Failure to do so will result in a lower score. 7. Assure that you have 12 different pages, including the formula sheet as the last page. AN AGGIE DOES NOT LIE, CHEAT, OR STEAL OR TOLERATE THOSE WHO DO

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MEEN 315—Fall 2010, Exam 2 Name ________________________ Section Number _______________ 2 I. Multiple choice problems worth 2 pts each. Circle the answer that is the most appropriate or closest (numerically) to your answer. 1. A substance in a closed system which is subject to boundary work only undergoes a constant pressure process from state 1 to state 2. The heat transfer q equals: A. c V (T 2 −T 1 ) C. h 2 −h 1 B. u 2 −u 1 D. R(T 2 −T 1 ) 2. The energy required to raise the temperature of a unit mass of a substance by one degree is A. specific energy C. specific enthalpy B. specific internal energy D. specific heat 3 . We want to find the precise change in h for air between 700 R and 1320 R. It is equal to A. 183.45 Btu/lb m C. 620.00 Btu/lb m B. 154.55 Btu/lb m D. Not enough information given 4. The work (or energy) needed to push (convect) mass into and out of a control volume is known as A. flow work C. energy work B. enthalpy work D. PdV (or pdv) work
MEEN 315—Fall 2010, Exam 2 Name ________________________ Section Number _______________ 3 5. For a steady state, steady flow process: A. dE CV /dt≠0 and dm CV /dt≠0 C. dE CV /dt=0 and dm CV /dt≠0 B. dE CV /dt=0 and dm CV /dt=0 D. dE CV /dt≠0 and dm CV /dt=0 6. The purpose of a diffuser is to A. increase speed, decrease pressure C. decrease speed, decrease pressure B. increase speed, increase pressure D. decrease speed, increase pressure 7. A perfect (ideal) gas whose specific heat c p =0.40 Btu/lb m ∙R flows through a throttle. Its initial temperature T 1 =200 ⁰F and its final temperature T 2 =300 ⁰F. What is the rate of heat transfer?

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## This note was uploaded on 01/03/2011 for the course MEEN 315 taught by Professor Ramussen during the Fall '07 term at Texas A&M.

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Fall 10 Exam 2 - MEEN 315Fall 2010 Exam 2 Name Section...

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