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Wednesday, 23 January 2013

Manufacturing process-III-model question paper for B.E/B.Tech engineering



1(a) Differentiate between Hot working, Cold working and Warm working. (6 Marks)
(b) What are residual stresses in wrought products? (4 Marks)
(c) Write a note on deformation of metals. (4 Marks)
(d) Explain in detail the influencing parameters in metal working process. (6 Marks)
2(a) What is hydrostatic stress. Write a note on its influence on metal working process. (6 Marks)
(b) Represent 3D principal stresses and their planes. (6 Marks)
(c) Prove that soct=mean of three principal stresses. (4 Marks)
(d) The state of stress at a point in a material is given by sx=80Mpa. sy =100MPa and τxy=60MPa. If the Y.S of the material is 150 MPa, determine whether yielding of the material will occur or not according to Trescas or Von Mises Criteria. (4 Marks)
3(a) Write a note on defects in forged products. (4 Marks)
(b) What are the assumptions made in open die forging? (4 Marks)
(c) With the help of neat sketches, explain the working of steam hammer and board hammer. (6 Marks)
(d) An Aluminium billet 24mm × 32 mm height is compressed between flat parallel anvils to a height of 15 mm. Determine the frictionless W.D Take average Y.S of the material = 54 KN/mm2. If m=1.4, find the maximum load exerted on the material. (6 Marks)
4(a) Derive the necessary minimum condition for rolling. (6 Marks)
(b) What is the effect of external load on the Roll radius? (4 Marks)
(c) Write a note on Rolling of structural shapes. (6 Marks)
(d) If the maximum reduction in rolling of slab is from 25mm to 15mm, calculate the value of coefficient of friction. Take the roll diameter as 750 mm. Also find the length of projection of arc of contact. (4 Marks)
5(a) Differentiate between Direct and Indirect extrusion process. (6 Marks)
(b) How is extrusion pressure and extrusion ratio related as a function of billet temperature? Explain. (6 Marks)
(c) Write a note on defects in extrusion products. (4 Marks)
(d)  What are the applications of extruded products? (4 Marks)
6(a) Explain drawing ratio. What is the maximum reduction in area that is possible in drawing for one pass? (6 Marks)
(b) Explain the different methods available for tube drawing. (6 Marks)
(c) What is the maximum reduction possible per pass in drawing Aluminium rod through a die of semi die angle 360,m=0.01. (8 Marks)
7(a) Explain the operation of a die-punch assembly using a neat sketch. (4 Marks)
(b) What are the basic operating parameters in a press? (4 Marks)
(c) What are the different HERF methods? Explain. (8 Marks)
(d) A blanking die is used for handling blanks of 150mm dia on 3mm thick M.S.sheet. Blanking takes place in 0.25 sec. Find the power required for driving motor. Take shear strength of the sheet=400MPa. (4 Marks)
8(a) What are the advantages and limitations of powder metallurgy? (4 Marks)
(b) Explain how blending of powder is carried out? What is its significance? (6 Marks)
(c) Explain the mechanism involved in sintering. (4 Marks)
(d) Distinguish between cold isostatic pressing and hot isostatic pressing. (6 Marks)

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