STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Explain commonly used materials for pattern making with advantages and limitations.
6 M
1 (b)
A slab of size 300×300×50 mm3 is requires to cast from a molten steel using a top riser of 170 mm diameter. If (d/h) = 2 for riser, calculate the freezing ratio.
6 M
2 (a)
Explain friction and lubrication in metal forming.
6 M
2 (b)
Explain types of rolling mills.
6 M
Answer any one question from Q3 and Q4
3 (a)
Explain submerged arc welding process. State the advantages and limitations of the process.
6 M
3 (b)
Explain extrusion of film.
6 M
4 (a)
Write short note on edge preparation in welding.
6 M
4 (b)
Compare between TIG and MIG welding process.
6 M
Answer any one question from Q5 and Q6
5 (a)
Calculate the amount of shear on the punch to cut a hole
of 60 mm diameter in 2 mm thickness plate. The ultimate
shearing strength of plate material is 400 MPa. If the punching force is to be reduced to half of the force using a punch without shear. Assume percentage penetration 68%.
7 M
5 (b)
Write a note on strip layout.
6 M
6 (a)
Explain with sketch type of pilots used in sheet metal working
6 M
6 (b)
Find centre of pressure for a MS part as shown in Fig. 6(b) with 1 mm thickness. Take ultimate shear strength of MS as 200 N/mm2.
7 M
Answer any one question from Q7 and Q8
7 (a)
With neat sketch explain back gear cone pulley type Headstock.
7 M
7 (b)
Explain Half nut mechanism.
6 M
8 (a)
Why lathe centres and mandrels are required while machining on lathe? Also draw neat sketch of any two types of lathe centres and mandrels.
7 M
8 (b)
Calculate the angle by which compound rest will be swiveled when cutting a taper on a job with diameters 90 mm and 40mm. Length of the job is 1.2m.
6 M
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