Production Process - 1 - Dec 2016

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.

Write a short note any four Q1.(a,b,c,d,e)

1(a) Transfer molding process(5 marks) 1(b) Friction welding(5 marks) 1(c) CO2 mould casting(5 marks) 1(d) Extrusion(5 marks) 1(e) Mechanism of sintering(5 marks) 2(a) With a neat sketch explain the principle and working of resistance welding process. Also discuss its advantages, limitations, and applications.(8 marks) 2(b) Differentiate Welding, soldering and brazing.(6 marks) 2(c) Discuss Rotational Molding process with neat sketch.(6 marks) 3(a) Describ the basic steps of provider metallurgy process. Discuss applications, advantages and disadvantages of power metallurgy.(8 marks) 3(b) Describe inspection of castings.(6 marks) 3(c) Write short note on microstructure of welds.(6 marks) 4(a) What is NDT.List various methods of NDT Explain Ultrasonic method of crack detection.(8 marks) 4(b) With a neat sketch explain the working principle of plastic injection mounding process.(6 marks) 4(c) What is meant by forging? Differentiate between closed die forging and open die forging.(6 marks) 5(a) Define weldability. Differentiate between TIG and MIG welding process.(10 marks) 5(b) Describe in detail various rolling defects.(10 marks) 6(a) A cylindrical riser must be designed for a sand casting mould. Casting itself is a rectangular plate made of steel, with dimensions 7.5 cm X 12.5 cm X 2.0 cm. Previous observations have indicated that the total solidification time (TST) for this casting is 1.6 min. The cylinder for riser will have D/H ratio=1. Determine the dimensions of riser so that its TST=2.0 min.(8 marks) 6(b) Explain vacuum forming process of polymers.(6 marks) 6(c) Write short note on application of plastics in industries.(6 marks)