Final exam ChE 350 Sp10

Final exam ChE 350 Sp10 - ChE 350 Spring 2010 Final Exam...

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ChE 350 Spring 2010 Final Exam (Show your work on all problems) (200 points total.) Name:_____________________________ 1 1. (15 pts) Estimate the rate of corrosion of Mg metal in the presence of H+, given the electrochemical kinetic data below. Provide your answer in units of mg/cm 2 sec. The molecular weight of Mg is 24.30 g/mol. Answer: _______________________
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ChE 350 Spring 2010 Final Exam (Show your work on all problems) (200 points total.) Name:_____________________________ 2 2. (20 pts) One type of thermostat relies on the use of a bimetallic strip of two metals with different thermal expansion coefficients, as shown below. Consider a bimetallic strip consisted of copper as one layer and iron as the other layer, as shown in the figure below. When thermal expansion stresses the beam beyond its bending strength bs σ , it permanently deforms. bs is related to the maximum strain in the beam max ε , at the outer surface, corresponding to Δ in Figure (a) below: max E bs = What is the maximum temperature limit that the thermostat based on such a bimetallic strip of copper and iron can withstand? Use the following parameters for your calculations: Material Elastic modulus (GPa) Yield Strength (MPa) Thermal Expansion Coefficient ( () 1 o 6 C 10 × ) Copper 100 100 21 Iron 70 270 11 T max =______________________
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ChE 350 Spring 2010 Final Exam (Show your work on all problems) (200 points total.) Name:_____________________________ 3 2. (cont’d) Write here if you need more space to show your work.
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ChE 350 Spring 2010 Final Exam (Show your work on all problems) (200 points total.) Name:_____________________________ 4 3.(20 pts) (a) Sketch a ( ) 0 2 1 plane and a [ ] 0 2 1 lattice direction on the unit cell below. (For credit, they must be drawn within the unit cell).
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This note was uploaded on 12/13/2011 for the course CHE 350 taught by Professor Sanchez during the Spring '08 term at University of Texas.

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Final exam ChE 350 Sp10 - ChE 350 Spring 2010 Final Exam...

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