Exam 2 Answers

Exam 2 Answers - MSE 200-002 Midterm Exam 2 Instructor...

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MSE 200-002 Midterm Exam 2 Spring 2007 ID Number: Instructor: Alexei Gruverman No notes, books, or information stored in calculator memories may be used. Cheating will be punished severely. All of your work must be written on these pages and turned in. Constants, equations, and other data are given on the last page of the exam. 1. Necking in the stress-strain testing refers to a. fracture without any deformation b. transition from elastic to plastic deformation c. large reduction in cross-section in a localized region d. none of the above (c) 2. In a ductile metal, necking typically begins to appear when: a. The yield strength is reached b. The material fractures c. The tensile strength is reached d. The material is strained to 0.002 (c) 3. Hooke’s Law ( σ = E ε ) applies to: a. The entire engineering stress-strain curve b. The engineering stress-strain curve in the elastic region c. The engineering stress-strain curve after the tensile strength is reached d. The engineering stress-strain curve after the yield strength is reached (b) 4. Hardness is a measure of a. material’s ability to recover elastic strain b. material’s ability to resist local plastic deformation c. material’s ability to resist corrosion d. material’s ability to resist elastic deformation ( b ) 1
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5. Young’s modulus determines a. a materials resistance to elastic deformation b. a materials resistance to plastic deformation c. a materials resistance to fracture d. a materials toughness ( a ) 6. How does the modulus of elasticity change as a function of increasing temperature? a. It typically increases b. It typically decreases c. It is not changed at all d. None of the above (b) 7. Toughness is: a. the material’s ability to absorb energy up to the yield strength b. the material’s ability to absorb energy up to fracture c. the material’s ability to absorb energy up to the tensile strength d. none of the above (b) 8. In the elastic region a material is elongated when a tensile stress is applied. What happens in the lateral direction? a. The material is also elongated b. The material does not change in the lateral direction c. The material begins to neck d. The material contracts (d) 9. In a compressive test, true stress a. is higher than engineering stress b. is lower engineering stress c. is equal to engineering stress d. depends on the specimen shape ( b ) 2
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10. Resilience is a measure of a material’s: a. capacity to absorb energy when it is deformed elastically b. capacity to absorb energy when it is deformed plastically c. capacity to absorb energy when it is deformed to fracture d.
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Exam 2 Answers - MSE 200-002 Midterm Exam 2 Instructor...

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