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Engineering · Mechanical Engineering
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6% .1.) Glasses and polymers do not melt at a definite temperature. So, their shaping with injection moulding or by blowing is possible. On the other hand, metals have a fixed melting point. E.g. m.p. of Al is 660.40C. Why this is so? Explain in three sentences below. 10% Q3.) Put the following materials in the order of increasing strength: (a) Linear polyethylene having an average molecular weight of 100,000 g/mol (b) Linear polyethylene having an average molecular weight of 75,000 g/mol (c) A polyethylene having an average molecular weight of 100,000 g/mol and 10% of the available sites are cross-linked. Strength increases in the order of: Xyzw) 10% Q.5.) The materials and their processing history is given below: (p) Copper (Cu) alloyed with 12 w/o Zinc (Zn) (q) Copper (Cu) alloyed with 22 w/o Zinc (Zn) and then 25% cold deformed. (r) Copper (Cu) alloyed with 22 w/o Zinc (Zn) 12% QA) (a) As far as the transparency concerned when the porcelain and glass is compared. comment on the following: must be used is produced by using liquid phase sintering. must be heated to a higher temperature in production stage 6% Q.2) A metal bar expands when heated, which can be found using thermal expansion coefficient. This is due to and
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