EXAM-I-AirIntro_2008_Spring Solution

EXAM-I-AirIntro_2008_Spring Solution - ENV 4101 Elements of...

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ENV 4101 Elements of Air Pollution /ENV 5105 Foundations of Air Pollution Midterm I (02/19/2008) Time: 115 min (10:40 am - 12:35 am), no extension . There are 2 parts in this exam. Part I , consisting of 11 questions weighing 57% of the total score, is a close-book, close-note exam. It is to test your conceptual understanding of the subjects covered in the course. You can expect to answer the questions without using a calculator. Short answers are expected. Part II , composed of 4 questions accounting for 43% of the total score, is an open-book, open-note exam. This part is to test your engineering capability of problem solving. You are expected to be able to select and use the right equations for a given scenario. You get Part I in the beginning of the exam. Once you have turned in your answer sheets for Part I, you can pick up Part II from the TA. You are NOT allowed to retrieve your answer sheets once you have turned them in. You decide how much time you want to allocate for each part. If you need additional information that is not included in the problems, make an assumption but justify it. You get partial credit for what you know. You are advised to read all questions first (in each part) in order to decide where to start. You are NOT required to solve the problems according to the order they appear. There is NO rule that you can NOT start from the bonus questions. Good luck and enjoy the exam! I, _____________________ (print) , understand that in this exam: (a) Part I is a close- book and close-note exam; and (b) Part II is an open-book, open-note exam and I can use any equipment such as a laptop for this part of exam but no discussion is allowed. I swear that I did the exam independently at the designated location without discussing any question with any other person during the exam. I swear that I will NOT reveal the questions to any other person after the exam. _______________________ (sign) ___________________________ (date)
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Name: ____________________ PART I 1. (a) Name and describe two (and only two) of the major respiratory deposition mechanisms. Impaction: inertia of particle is too large for it to follow air flow path; impacts onto obstruction; works best for larger particles (>3 micron). Interception: the dimension of the particle results in the deposition even though its center follows the streamline. Diffusion: Random motion leads to deposition of particles on lung lining; very common for small particles (<0.1 micron). Gravitation settling: As flow slows down in distal regions of lungs (esp. horizontal branches of the lungs), gravity can pull particles down to settle them; works better with increasing particle size. b) Explain the presence of the extremes (two maximum and one minimum for the Total Deposition line) on the above fractional respiratory deposition chart. Gravitational settling, interception and impaction are dominant deposition
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EXAM-I-AirIntro_2008_Spring Solution - ENV 4101 Elements of...

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