Production Process - 1 - Dec 2013

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 short note on any four of following -

1 (a) Pattern allowances(5 marks) 1 (b) Thermit welding process(5 marks) 1 (c) Blow moulding process(5 marks) 1 (d) Roling defects(5 marks) 1 (e) Important properties of moulding sand(5 marks) 2 (a) Explain the process of production of seamless tubes by roling process.(6 marks) 2 (b) What is weldability? Discuss various welding defects with their remedies.(8 marks) 2 (c) With a neat sketch explain the principle of electro slag welding process.(6 marks) 3 (a) Name various methods of powder manufacturing techniques in powder metallurgy and explain any one in detail.(8 marks) 3 (b) Compare TIG and MIG welding process.(8 marks) 3 (c) Write shorts note on applications of plastics in industries.(4 marks) 4 (a) What is NDT. Explain any two NDT methods in detail.(8 marks) 4 (b) With a neat sketch explain the working principle of plastic injection moulding process.(6 marks) 4 (c) List important applications of powder metallurgy technique.(6 marks) 5 (a) With neat sketches explain briefly on "fraction welding".(6 marks) 5 (b) A casting of 50cm ×40cm ×10cm size solidifies in 20 minutes.Find the solidification time for 40cm×30cm×5cm casing under similar conditions.(8 marks) 5 (c) Differentiate between "soldering" and "brazing" operation.(6 marks) 6 (a) With the help of a neat sketch explain the complete gating system in casting process.(8 marks) 6 (b) Defines the terms "Spread", "Elongation", and "Draft" w.r.t. Roling process.(6 marks) 6 (c) Explain vaccum forming process of polymers.(6 marks)