Production Process - 1 - May 2012

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 notes on any four of the following -

1 (a) Pattern allowances(5 marks) 1 (b) Up milling, down milling(5 marks) 1 (c) CO₂ Welding(5 marks) 1 (d) CNC machines (5 marks) 1 (e) Grinding wheel selection and specification.(5 marks) 2 (a) Describe with neat sketch the manufacturing of Pig iron using blast furnace.(10 marks) 2 (b) Describe the important properties of Moulding sand(6 marks) 2 (b) Draw neat sketches of following drilling operations -
(i) Counter boring
(ii) Reamming(4 marks) 3 (a) Explain working of dividing head of milling machine with suitable numerical example.(10 marks) 3 (b) Explain centreless grinding operation.(6 marks) 3 (c) Define cutting speed and feed in case of turning operation.(4 marks) 4 (a) Classify planning machines. Sketch and describe the construction of double column planner.(10 marks) 4 (b) What is mean by Grain, grade and structure of grinding wheel?(6 marks) 4 (c) Sketch and state the use of following accessories of lathe -
(i) Mandrel
(ii) Face Plate(4 marks) 5 (a) What is weldability? Discuss various welding defects with their remedies.(10 marks) 5 (b) Discuss Electro-slag welding process.(6 marks) 5 (c) Explain the sintering process in powder metallurgy.(4 marks) 6 (a) Explain the construction, working application of Ultrasonic machining process. Discuss its advantages and disadvantages.(10 marks) 6 (b) Compare EDM and ECM.(6 marks) 6 (c) Why risers are used in casting process?(4 marks) 7 (a) What is NDT? Explain any two NDT Methods.(10 marks) 7 (c) Discuss the important steps of making powder in powder Metallurgy.(6 marks) 7 (c) Differentiate Shaper and Planner.(4 marks)