# t3s03 - Home Introduction Policies Resources Requirements &...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Test 3

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Q1. The following phase diagram is given for an alloy with A and B. Answer the following q 1. The above phase diagram belongs to a a. an isomorphous system b. limited solid solubility c. single component system 2. The labeling of the phase diagram is correct in a. figure (a) b. figure (b) c. figure (c) 3. The total number of phases in this phase diagram are a. 3 b. 4 c. 2 4. The phase rule that could be applied to this diagram is a. P+F=C+2 b. P+F=C+1 c. P+F=C 5. The number of regions with degrees of freedom equal to 2 in this diagram are a. 2 b. 3 c. 1 6. The number of solvus lines in this diagram are a. 4 b. 2 c. 5 7. The number of invariant points in this diagram are a. 3 b. 1 c.2 8. The invariant point is this diagram is called a. eutectic point b. eutectoid point c. peritectic point 9. An alloy with single melting point in this diagram is with composition close to a. 50%B b. 15% B c. 80%B 10. The maximum solubility of B in A is a. 80% b. 15% c. 48% 11. An alloy with composition of 48%B is heated from a higher temperature. The reaction it a. L-> α + β b. α + β ->L c. S-> α + β 12. Upon cooling below the reaction temperature, the fraction of phases are a. f α =0.492, f β =0.508 , fL=0 b. f α =0, f β =0.508 , fL=0.492
c. f α =0.508, f β =0.492 , fL=0 13. The microstructure of this alloy at room temperature is shown below. Choose the correct 14. Coose the microstructure of an alloy with composition below 48%B and above 15% B fr 15. The chunky or big circular regions in the micostructure of an alloy with 40%B represent a. euetectic phases b. proeutectic phase c. precipitates 16. The small circular regions in the microstructure of an alloy with 48% B represent

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## This note was uploaded on 10/11/2009 for the course MSE 200 taught by Professor Wholedepartment during the Spring '08 term at N.C. State.

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t3s03 - Home Introduction Policies Resources Requirements &...

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