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NATIONAL UNIVERSITY OF SINGAPORE EXAMINATION FOR THE DEGREE OF B.ENG. (Semester I: 2007/2008) ME2151 – PRINCIPLES OF MECHANICAL ENGINEERING MATERIALS November 2007 – Time Allowed: 2 Hours INSTRUCTIONS TO CANDIDATES 1. This examination paper contains SIX (6) questions and comprises SIX (6) printed pages. 2. Answer ALL questions. 3. Questions DO NOT carry equal marks. 4. This is a CLOSED BOOK examination.
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ME2151 Page 2 Question 1 Answer A (for TRUE ) or B (for FALSE ) to each of the following questions. On the separate answer sheet provided, shade the appropriate circle (A or B only ) using a 2B pencil. Submit the answer sheet separately , ensuring that you have also shaded your matriculation number. DO NOT write your answers in the answer booklet(s). N.B. Each correct answer will be awarded 2 marks; each wrong answer will incur a penalty of 1 mark; i.e., –1 mark. No marks will be awarded or deducted for leaving the answer blank; i.e. 0 mark. (a) Ductility, as measured by percent elongation, is the total strain in the tensile specimen just before fracture. (b) When atoms in a solid are separated by their equilibrium bond lengths, the potential energy of the solid is at a minimum. (c) Materials with deep and narrow potential wells tend to have high coefficients of thermal expansion. (d) Single crystals are anisotropic because the number of atoms and their interatomic spacing vary with direction. (e) Interstitial diffusion of carbon in BCC iron is slower than in FCC iron at the same temperature because interstitial spaces in BCC iron are much smaller.
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