Production Process - 1 - Dec 2011

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) Compare Ferrous and Non-ferrous metals.(4 marks) 1 (b) Distinguish clearly between the Patterns and Core boxes.(4 marks) 1 (c) Define "cutting speed and feed" in case of drilling operation.(4 marks) 1 (d) How are Milling Machines classified with a neat sketch? Describe any one Milling Machine.(8 marks) 2 (a) Find out train of gears if 20 TPI are to be cut on a lathe machine having a level screw of 4 TPI.(8 marks) 2 (b) What are the functions of a speed shaft and lead screw in a centre lathe?(6 marks) 2 (c) List various methods to taper turning on a centre lathe. Explain the method of the tail stock offsetting to get the taper.(6 marks) 3 (a) Explain centreless grinding operation.(6 marks) 3 (b) Explain working of a dividing head of a Milling Machine with suitable numerical example.(10 marks) 3 (c) Differentiate between reaming and counter boring operation on drilling machine.(4 marks) 4 (a) Why Risers are used? Sketch different types of Risers and Mention in which situations they are used?(8 marks) 4 (b) Explain the identification; causes and remedial measures of the following casting defects -
(i) Scab
(ii) Blow Holes
(iii) Shrinkage Cavities
(iv) Mismatch(8 marks) 4 (c) State the use of following accessories of lathe -
(i) Mandrel
(ii) Face-plate
(iii) Follower rest
(iv) Collet(4 marks) 5 (a) With neat sketch explain submerged are welding process its advantages and limitations.(8 marks) 5 (b) Discuss Electro-slag welding process.(8 marks) 5 (c) What are the important elements used in making High speed steels single point cutting tool ? How different percentages of such elements affect the machining?(4 marks) 6 (a) Explain in details Plasma Arc Machining (PAM)(6 marks) 6 (b) Compare EDM and ECM in details.(8 marks) 6 (c) Explain advantages and disadvantages of powder metallurgy.(6 marks)

Write the explanatory notes on any four of the following -

7 (a) Different Types of Gates(5 marks) 7 (b) Stub Welding(5 marks) 7 (c) Brazing and Soldering(5 marks) 7 (d) Sintering Process in Powder Matallurgy(5 marks) 7 (e) Metal Spraying (5 marks) 7 (f) Centre Lathe and Capstan Lathe.(5 marks)