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Engineering · Mechanical Engineering
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1296 Q.1.) Answer the following questions as true or false (Two False cancels one True): The ductility of AISI 1030 steel is higher than AISI 1050 when both steels are in annealed a) condition T F b) 7075 T6 is a type of aluminum alloy. The first four digit shows the T F T F T F T F chemical composition. c) Polymers dont have creep failure d) Not only steels but glasses can also be annealed e) An Al-4%Cu alloy is a type of aluminum, that can be age hardened f) At identical molecular weight, the glassy transition temperature (Tg) of a polymer increases as % crystallinity decrease T F 6% Q2) The tool must cut glass plates. For this application which of the following materials would be suited most: (a) An austenitic stainless steel. (b) A quenched and tempered (200°C) plain carbon steel tool with 0.3%C. (c) WC-Co cutting tool produced by powder metallurgy methods (d) A quenched and tempered (200°C) plain carbon steel tool with 0,8%C. (e) Ni-Cr-Co superalloy 16% QA) You are given below the chemical composition ofseveral materials. You are also given several industrial applications. For these applications select the most appropriate material from the given ones. MATERIAL APPLICATION A 0.2%C steel Oxygen sensor | 60%cold worked steel C Polycarbonate D | 90%WC+ 109°Co composite E Bakalite For drilling the marble stone 19 It drinking water bottles Frame for an expensive Bicyele F Piezoelectric ceramic G Epoxy-Graphite fiber composite Cable of the crane hook The matrix material of a braking pad (car) 316 grade stainless steel (FCC) I Pure Cu 6% Q.6.) Which steel below can be welded more easily ? (No cracking tendency) (a) 0,8%C steel (b) 0.2%C steel (c) 0,4%C+4%Cr steel (d) None of them 5% Q.7.) Put the following materials in the order of increasing % elongation: (r) Polypropylene having a 50% crystallinity. (s) Natural Rubber (t) Polypropylene having a 20% crystallinity and (u) A network polymer Bakalite
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