First Exam(F06)

First Exam(F06) - The Hashemite University Faculty of...

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Machine Design I Fall 2006 Instructors: Prof. Mousa Mohsen & Dr. Ala Hijazi The Hashemite University Faculty of Engineering Mechanical Engineering Department First Exam Name: _____________________ Part I – Closed Book Please Read Questions Carefully – Good Luck! (20 points) 1. For the flowing statements circle the correct answer. Cold working decreases the ductility of the material. T F For a shaft of rectangular cross section subjected to torsion, the maximum shear stress will occur at the corners. T F In a thick-walled pressure vessel the stress decreases as we move away from the inner surface. T F In a rotating ring, the maximum stress occurs at the inner surface. T F The factor of safety can be either equal or smaller than the design factor. T F Stress concentration factors should be used for brittle materials but not for ductile materials. T F A number of samples were picked randomly out of a truck load of steel pieces and were tested for yield strength. If engineer "A" reported

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