chEng100 mt 1

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School

University of California, Los Angeles *

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Course

100

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Mechanical Engineering

Date

Jan 9, 2024

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pdf

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19

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22F-CH ENGR-100-LEC-1 Midterm 1 Exam JAMIE WEISEL TOTAL POINTS 59 / 105 QUESTION 1 Making coffee 32 pts 1.1 7 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m7 value + 1 pts m8 value + 1 pts other balance equations but not correct 1.2 8 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m3 value + 1 pts m5 value + 1 pts other balance equations but not correct 1.3 8 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m4 value + 1 pts m6 value + 1 pts other balance equations but not correct 1.4 1 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m1 value + 1 pts m2 value + 1 pts other balance equations but not correct + 0 pts Click here to replace this description. QUESTION 2 Making Ammonia 35 pts 2.1 14 / 25 + 5 pts Control volume correctly + 5 pts Calculate molar flow rates of N2 and O2 in the air at the beginning correctly + 5 pts Calculate molar flow rates of N2, O2, and H2 in flow out of condenser 2 correctly + 5 pts Calculate molar flow rates of N2, O2, and H2 in recycle flow correctly + 5 pts Calculate molar flow rates of N2, O2, and H2 in purge flow correctly + 4 Point adjustment Overall correct for pathways 2.2 0 / 5 + 0 pts Wrong answer or leave it blank + 2 pts Got the ideal production of NH3 + 2 pts Got the real production of NH3 + 1 pts Get the conversion through real/ideal 2.3 5 / 5 + 5 pts Correct + 0 pts Leave it blank or wrong answer QUESTION 3 Making batteries 33 pts 3.1 3 / 5 + 1 pts Control volume + 1 pts Inlet flow + 1 pts Differential equation + 1 pts Balance + 1 pts proof of work + 0 pts blank + 1 pts Expression 3.2 7 / 15
+ 4 pts Balance + 4 pts Initial condition + 2 pts Derivation + 2 pts Differential equation + 3 pts Proof of work + 0 pts Blank 3.3 3 / 13 + 3 pts Differential equation + 3 pts Derivation + 2 pts Integral + 2 pts Function + 3 pts Proof of work + 0 pts Blank QUESTION 4 4 Bonus 3 / 5 + 3 pts Correct a + 2 pts Correct b + 0 pts Blank or incorrect Page 2
1.1 7 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m7 value + 1 pts m8 value + 1 pts other balance equations but not correct Page 3
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1.2 8 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m3 value + 1 pts m5 value + 1 pts other balance equations but not correct Page 4
1.3 8 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m4 value + 1 pts m6 value + 1 pts other balance equations but not correct Page 5
1.4 1 / 8 + 3 pts Balance equation 1 + 3 pts Balance equation 2 + 1 pts m1 value + 1 pts m2 value + 1 pts other balance equations but not correct + 0 pts Click here to replace this description. Page 6
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2.1 14 / 25 + 5 pts Control volume correctly + 5 pts Calculate molar flow rates of N2 and O2 in the air at the beginning correctly + 5 pts Calculate molar flow rates of N2, O2, and H2 in flow out of condenser 2 correctly + 5 pts Calculate molar flow rates of N2, O2, and H2 in recycle flow correctly + 5 pts Calculate molar flow rates of N2, O2, and H2 in purge flow correctly + 4 Point adjustment Overall correct for pathways Page 7
2.2 0 / 5 + 0 pts Wrong answer or leave it blank + 2 pts Got the ideal production of NH3 + 2 pts Got the real production of NH3 + 1 pts Get the conversion through real/ideal Page 8
2.3 5 / 5 + 5 pts Correct + 0 pts Leave it blank or wrong answer Page 9
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3.1 3 / 5 + 1 pts Control volume + 1 pts Inlet flow + 1 pts Differential equation + 1 pts Balance + 1 pts proof of work + 0 pts blank + 1 pts Expression Page 10
3.2 7 / 15 + 4 pts Balance + 4 pts Initial condition + 2 pts Derivation + 2 pts Differential equation + 3 pts Proof of work + 0 pts Blank Page 11
3.3 3 / 13 + 3 pts Differential equation + 3 pts Derivation + 2 pts Integral + 2 pts Function + 3 pts Proof of work + 0 pts Blank Page 12
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4 Bonus 3 / 5 + 3 pts Correct a + 2 pts Correct b + 0 pts Blank or incorrect Page 13
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