Production Technology - Dec 2014

Mechanical Engineering (Semester 8)

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. 1 (a) Derive the Taylor's equation for tool life.(7 marks) 1 (b) What are chip breakers? Explain them briefly. If they are not used what adverse effects chip can produce on the work, tool and surroundings?(7 marks) 2 (a) What are the different methods of gear manufacturing? List the methods and explain any one.(7 marks)

Answer any two question from Q2 (b) or Q2 (c)

2 (b) Prove that tan ϕ=r cos α/(1-r cos α)(7 marks) 2 (c) What are crater wear and flank wear? Explain.(7 marks)

Answer any two question from Q3 (a), (b) or Q3 (c), (d)

3 (a) Explain Laser beam machining process in detail.(7 marks) 3 (b) What are the different types of thread manufacturing processes? Explain with neat sketch.(7 marks) 3 (c) Describe water jet machining process with the help of neat sketch. State its advantages and application.(7 marks) 3 (d) What are common ejecting mechanisms used in power presses? Describe.(7 marks)

Answer any two question from Q4 (a), (b) or Q4 (c), (d)

4 (a) Describe the common bending operations performed on presses.(7 marks) 4 (b) Compare the merits and demerits of Turret and Capstan lathes with a conventional engine lathe.(7 marks) 4 (c) Explain the principle of "Six point location".(7 marks) 4 (d) Explain with the principle of EDM. State characteristics of dielectric fluid.(7 marks)

Answer any two question from Q5 (a), (b) or Q5 (c), (d)

5 (a) Explain the different machine tool structures.(7 marks) 5 (b) Differentiate between a jig and a fixture. Explain one clamping device.(7 marks) 5 (c) Define machinability and explain variables affecting it.(7 marks) 5 (d) Describe the methods of punch support.(7 marks)