STUPIDSID
Answer any one question from Q1 and Q2
1 (a)
Explain the following defects in casting components with their causes and remedies. (i) Mismatch (ii) Blow holes
6 M
1 (b)
A 200 mm long down sprue has an area of cross section of 650 mm2 where the pouring basin meets the down sprue. A constant head of molten metal is maintained by the pouring basin. The molten head flow rate is 6.5×105 mm3/s. Considering the end of the down sprue to be open to atmosphere and acceleration due to gravity as 104 mm/s2 at it ends , find the area of the sprue at the end.
6 M
2 (a)
Mention the ingredients present in the moulding sand and its effect on the properties of moulding sand.
6 M
2 (b)
Explain in detail Lost-Wax casting process in details.
6 M
Answer any one question from Q3 and Q4
3 (a)
A solid material mode of stainless steel is 50 mm in diameter and 76mm in height, It is reduced in height by 50% with the help of open-die forging. The work material has a flow curve defined by K=350 Mpa and n=0.17. If coefficient of friction is 0.1, calculate the forging force at the end of stroke.
6 M
3 (b)
Explain (i) Wire Drawing (ii) Shot Peening.
6 M
4 (a)
Explain working principles of forward and backward extrusion process.
4 M
4 (b)
Write down difference between Hot working and cold working.
5 M
4 (c)
Briefly explain the Rotary swagging.
3 M
Answer any one question from Q5 and Q6
5 (a)
With the aid of sketches, compare the principles of compression moulding, injection moulding and extrusion moulding. Describe where each would be used in terms of material and components.
7 M
5 (b)
Explain in detail vacuum process.
6 M
6 (a)
Explain in detail Gas Tungsten Arc Welding.
6 M
6 (b)
Compare with neat sketches leftward and rightward welding techniques. Specify the merits and limitations of both the techniques.
7 M
Answer any one question from Q7 and Q8
7 (a)
A hole 100mm diameter is to be punched in a steel plate of 6 mm thick. The material is cold rolled C30 steel for which the maximum shear strength can be taken as 370 N/mm2 with normal clearance on the tools, cutting is completed at 40% penetration of the punch. Giving suitable diameter for the punch and die, and shear angle on the punch in order bring the work within the capacity of a 200KN press available in the shop.
7 M
7 (b)
Describe the following terms:
i) Sheet utilization ratio.
ii)Centre of pressure
iii)Shear or punch and die.
i) Sheet utilization ratio.
ii)Centre of pressure
iii)Shear or punch and die.
6 M
8 (a)
Explain taper turning attachment with a neat diagram. Give its merits and demerits.
7 M
8 (b)
A part of 25 cm in diameter and 50 cm length is to be turned down to 23.5 for the entire length . Assume feed as 1 mm/ rev . and cutting speed as 135 mpm . The maximum allowable depth of cut is 5 mm. what are the feed speed, spindle r.p.m and cutting time. Take over travel as 12.5 mm.
6 M
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