Manufacturing Process 1 - Dec 2014

Mechanical Engg (Semester 3)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.

Answer any one question from Q1 and Q2

1 (a) Discuss various types of patterns with suitable sketches.(8 marks) 1 (b) Describe the pattern making allowances. What is the use of contraction rule.(8 marks) 10 (a) Explain with sketch the geometry of plain milling cutter.(8 marks) 10 (b) Explain the working of universal dividing head.(10 marks)

Answer any one question from Q11 and Q12

11 (a) The following letters are printed on a grinding wheel 'W-C-80-T-9-S-O'. Explain the meaning of each letter mentioned in the above specification of grinding wheel.(6 marks) 11 (b) Explain the factors in the selection of grinding wheel.(6 marks) 11 (c) Differentiate between Honing and Lapping.(4 marks)

Write short notes on:

12 (a) Super finishing.(4 marks) 12 (b) Buffing and Polishing.(4 marks) 12 (c) Tool and cutter grinder.(4 marks) 12 (d) Cylindrical grinder.(4 marks) 2 (a) Describe investment casting process with neat sketch. Also state its advantages, limitations and applications.(8 marks) 2 (b) Explain hot chamber die casting with suitable sketch.(8 marks)

Answer any one question from Q3 and Q4

3 (a) Explain hot and cold working process.(4 marks) 3 (b) Explain working principle of forward and backward extrusion process.(4 marks) 3 (c) Explain rolling operation and various types of rolling mills.(8 marks) 4 (a) Explain:
(i) Metal Spinning
(ii) Tube Drawing.(8 marks) 4 (b) Sketch and explain the working of universal rolling mill and planetary rolling mill.(8 marks)

Answer any one question from Q5 and Q6

5 (a) Describe the process Submerge Arc Welding stating its advantages and limitations.(8 marks) 5 (b) Differentiate between: (i) TIG welding and MIG welding
(ii) Soldering and Brazing.(8 marks) 6 (a) Explain principle of resistance welding and its application.(6 marks) 6 (b) Describe various types of adhesive and their applications.(6 marks) 6 (c) Differentiate between spot and seam welding.(4 marks)

Answer any one question from Q7 and Q8

7 (a) What are the various types of rake angle and its effect on orthogonal cutting operation(6 marks) 7 (b) List out the various operations performed on lathe machine. Explain any one with neat sketch.(8 marks) 7 (c) Write down purpose of the following lathe parts:
(i) Half nut
(ii) Tail-stock(4 marks) 8 (a) Define and state the importance of the speed, feed and depth of cut in cutting operation.(9 marks) 8 (b) Calculate the machine time required to reduce 60 mm diameter shaft to 50 mm diameter for a length of 1500 mm with depth of cut of 2 mm for rough cut and 1 mm for finish cut. Given:
i) Cutting speed: 30 m/min
(ii) Feed: 0.5 mm/rev
(iii) Approach length: 5 mm
(iv) Over run length: 5 mm
(v) No. of Passes: 3 (2 rough cut plus 1 finish cut).(9 marks)

Answer any one question from Q9 and Q10

9 (a) Differentiate between up-milling and down-milling.(6 marks) 9 (b) It is required to divide the periphery of a job into 28 equal divisions. Find the indexing arrangement.(4 marks) 9 (c) List out the various operations carried out on milling machine. Explain any two with neat sketch.(8 marks)