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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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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.
- Spring '08