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(MECH2520)[2012](s)midterm~ckchauab^_50407.pdf
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Depaartment oof Mechan ical Enginneering MECHH 2520 Deesign and MManufact turing 1 Mid\TTerm Exammination 222ndOctobber 2012
No Plagiarismm No messaginng and commmunicatiion duringg examinaation
Ansswer all quuestions ( 80 marks))
Queestion 1 ((total 24 mmarks)

Giveen the abovve drawing oof a bearing pedestal, s state the funnction of ea ch of the foollowing itemms:
1\1 1\2 1\3 1\4 1\5 1\6
1\7 1\8 1\9
item 1 (2 m arks) item 2 (2 m arks) item 3 (2 m arks) item 4 (2 mmarks) Item 5 (2 mmarks) Item 13 (2 mmarks)
SState what are items 6 \7\8 (6 mar ks)
Explain whaat is the me aning of thee subscript 2 under ittems 6\7\8 ((2 mark)
Items 9\10\\11\12 are s imilar to iteems 6\7\8, s tate the diffference (4 mmarks)

Question 2: (total 16 marks)
2\1 Explain the use of chamfer at the ends of holes and shafts. (2 marks)
2\2 What is the condition for clearance fit between holes and shafts? (2 marks)
2\3 State the difference in applications for clearance fit, transitional fit, and interference fit. (6 marks)
2\4 Explain the relationship amongst tolerance, surface finish, and manufacturing process. (6 marks)


Question 3: (total 18 marks)
3\1 How to differentiate ductile and brittle materials? (2 marks)
3\2 Use sketch to illustrate the effect of temperature on the stress\strain curve of steel. (4marks)
3\3 Use sketch to illustrate the change in stress\strain curve of aluminum before and after rolling. (4 marks)
3\4 What is creep and how it would affect the performance of stainless steel components? (6 marks)
3\5 What is the use of Proof Stress? (2marks)

Questi on 4 (22 marks)