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q4sum03 - region(c 6 Castings are preferably made in a...

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Home Introduction Policies Resources Requirements & Grading Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact MSE 200 Quiz 4 1. The phase that exists at any temperature, pressure, and composition
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is that with a. highest free energy b. lowest free energy c. zero free energy (b ) 2. The degrees of freedom in a two component system with three phases in equilibrium when pressure effects being null are a. 2 b. 1 c. zero (c ) 3. Along a phase boundary, the free energy of the adjacent phases are a. equal b. zero c. high (b ) 4. Magnesium and antimony are elements with size factor below 15%, valency of 2 and 5 respectively, hcp and less close packed layered structure respectively, and magnesium is a metal and antimony is ready to accept electrons, the solid solubility between magnesium and antimony will be a. high b. low c. none (c ) 5. Tie line is always drawn a. in a single phase region b. at the invariant point c. in a two-phase
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Unformatted text preview: region (c) 6. Castings are preferably made in a region a. close to eutectic b. in hypoeutectic c. in hyper eutectic ( a) 7. In the absence of an invariant point in a two component system, the melting of an alloy is a. at a single point b. in a range c. absent (b ) 8. Small atoms like carbon, hydrogen, oxygen and nitrogen occupy a. substitutional sites b. random sites c. interstitial sites (c ) 9. A two phase region is always bound along the composition by a. other two phase regions b. single phase regions c. an invariant point ( b) 10. Maximum strengthening due to precipitation hardening is a result of internal stress from precipitates that are a. coherent b. partially coherent c. noncoherent (a ) 11. A directionally cooled and layered composite structure can be obtained by choosing a composition in the region of a. hypoeutectic b. hyper eutectic c. eutectic (c )...
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