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Unformatted text preview: 6. Fatigue strength is property defined for a. ferrous materials b. bcc materials c. nonferrous materials ( c) 7. With increasing average stress applied on a sample under fatigue, the range of stress a. increases b. decreases c. does not change (b ) 8. Turbine blades are designed to operate in the a. stage I creep b. stage II creep c. stage III creep (b ) 9. Turbine blades are made of single crystals because a. Hall-Petch equations shows high strength b. Hall-Petch equation gives low strength c. voids should not be nucleated (c ) 10. Elastic -plastic stress strain curve is observed in a. steels b. aluminum c. lead (metal) ( c) 11. Fracture strength is obtained from a. engineering stress-strain curve b. true stress-true strain curve c. engineering stress-true strain curve (b )...
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- Spring '08