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8. Which of the following statement is correct? a. Tempered martensite has higher yield strength than martensite. b. Tempered martensite has lower UTS than martensite. c. Tempered martensite has lower ductility than martensite. d. a and c 12. To increase yield strength of an alloy, which of the following mechanisms do you recommend? a. Decreasing grain boundary density b. Increasing dislocation density above equilibrium density c. Decreasing interstitials d. a and b 11. Impact tests can be used to determine a. Yield Strength b. Toughness c. Ductile to brittle transition temperature d. b and c

8. Which of the following statement is correct? a. Tempered martensite has higher yield strength than martensite. b. Tempered martensite has lower UTS than martensite. c. Tempered martensite has lower ductility than martensite. d. a and c 12. To increase yield strength of an alloy, which of the following mechanisms do you recommend? a. Decreasing grain boundary density b. Increasing dislocation density above equilibrium density c. Decreasing interstitials d. a and b 11. Impact tests can be used to determine a. Yield Strength b. Toughness c. Ductile to brittle transition temperature d. b and c

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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For each question, provide an explanation, identifying the correct choice ( it is marked in red)  and explaining why it's the right answer, as well as why the other options are incorrect. Please do all three

### Understanding Material Properties and Testing Methods #### Question 8: **Which of the following statement is correct?** - a. Tempered martensite has higher yield strength than martensite. - **b. Tempered martensite has lower UTS than martensite.** - c. Tempered martensite has lower ductility than martensite. - d. a and c *Explanation:* - **Correct Answer:** b. Tempered martensite has lower Ultimate Tensile Strength (UTS) than martensite. This means the strength before the material breaks is lower in tempered martensite compared to untempered martensite. #### Question 12: **To increase the yield strength of an alloy, which of the following mechanisms do you recommend?** - a. Decreasing grain boundary density - **b. Increasing dislocation density above equilibrium density** - c. Decreasing interstitials - d. a and b *Explanation:* - **Correct Answer:** b. Increasing dislocation density above equilibrium density. This method involves increasing the number of dislocations, which can hinder the movement of other dislocations and increase the material's yield strength. #### Question 11: **Impact tests can be used to determine:** - a. Yield Strength - b. Toughness - **c. Ductile to brittle transition temperature** - d. b and c *Explanation:* - **Correct Answer:** d. b and c. Impact tests are primarily used to measure toughness, which is the ability of a material to absorb energy and plastically deform without fracturing. They also help determine the ductile to brittle transition temperature, which is the temperature below which the material behaves in a brittle manner. These questions evaluate understanding of the mechanical properties of materials and how various tests can provide insights into those properties.
Transcribed Image Text:### Understanding Material Properties and Testing Methods #### Question 8: **Which of the following statement is correct?** - a. Tempered martensite has higher yield strength than martensite. - **b. Tempered martensite has lower UTS than martensite.** - c. Tempered martensite has lower ductility than martensite. - d. a and c *Explanation:* - **Correct Answer:** b. Tempered martensite has lower Ultimate Tensile Strength (UTS) than martensite. This means the strength before the material breaks is lower in tempered martensite compared to untempered martensite. #### Question 12: **To increase the yield strength of an alloy, which of the following mechanisms do you recommend?** - a. Decreasing grain boundary density - **b. Increasing dislocation density above equilibrium density** - c. Decreasing interstitials - d. a and b *Explanation:* - **Correct Answer:** b. Increasing dislocation density above equilibrium density. This method involves increasing the number of dislocations, which can hinder the movement of other dislocations and increase the material's yield strength. #### Question 11: **Impact tests can be used to determine:** - a. Yield Strength - b. Toughness - **c. Ductile to brittle transition temperature** - d. b and c *Explanation:* - **Correct Answer:** d. b and c. Impact tests are primarily used to measure toughness, which is the ability of a material to absorb energy and plastically deform without fracturing. They also help determine the ductile to brittle transition temperature, which is the temperature below which the material behaves in a brittle manner. These questions evaluate understanding of the mechanical properties of materials and how various tests can provide insights into those properties.
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