Production Process - 1 - Dec 2015

Mechanical Engineering (Semester 3)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) Explain various welding defects with their causes and remedies.(10 marks) 1 (b) Differentiate between soldering and brazing.(5 marks) 1 (c) Compare transfer molding and compression molding.(5 marks) 2 (a) A cylindrical riser is to be designed for a sand casting mould. The size of steel casting is 7.5 cm × 12.5 cm × 2cm. The previous observation have indicated that the total solidification time for casting is 96 sec.
The cylindrical riser have (d/h)=I. Find the size of user so that its solidification Time is 120 sec.(10 marks) 2 (b) Discuss friction welding with its applications.(5 marks) 2 (c) Differentiate between open and closed die forging.(5 marks) 3 (a) Discuss various rolling defects.(6 marks) 3 (b) Differentiate between core and core point.(6 marks) 3 (c) With a neat sketch explain resistance welding process giving its applications.(8 marks) 4 (a) Write advantages and disadvantages of powder metallurgy.(6 marks) 4 (b) With a neat sketch explain swaging process.(6 marks) 4 (c) What are the different NTD methods? Explain any two methods in detail.(8 marks) 5 (a) Explain the screw type injection moulding with neat sketch. Discuss its advantages, limitations and applications.(8 marks) 5 (b) Discuss different methods of making in powder Metallurgy.(6 marks) 5 (c) Explain different gas welding equipments.(6 marks)

Write short note on:

6 (a) Pattern allowances(5 marks) 6 (b) Casting defects(5 marks) 6 (c) Thermite welding(5 marks) 6 (d) Thread rolling.(5 marks)