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Manufacturing Process - 1 : Question Paper Dec 2016 - Mechanical Engineering (Semester 3) | Gujarat Technological University (GTU)

## Manufacturing Process - 1 - Dec 2016

### Mechanical Engineering (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.
1(a) Differentiate between primary and auxillary cutting motions in machine tools.(1 marks) 1(b) What is the function of a folllower rest during turning?(1 marks) 1(c) State when up milling is preferred to down milling(1 marks) 1(d) What is the function of a dead centre?(1 marks) 1(e) What is the improtance of a heix angle in a drill bit?(1 marks) 1(f) Name the types of abrasives used for making a grinding wheel.(1 marks) 1(g) Write Taylor's tool life equation.(1 marks) 1(h) Define tool life.(1 marks) 1(i) State the function of cutting fluids(1 marks) 1(j) What are natural and artificial abrasives?(1 marks) 11(k) What is a chapper bx in a shaper?(1 marks) 12(l) Define "feed" in a turning operation.(1 marks) 13(m) Define 'boring'.(1 marks) 14(n) How many tools can be fitted on a capstan lathe at a time?(1 marks) 2(a) Explain the difference between right hand and left hand single point cutting tools with neat sketches.(3 marks) 2(b) Explain the importance of back rake and end relief angles in a single point cutting tool.(4 marks)

### Solve any one question.Q2(c) &Q2(d)

2(c) State the advantages of all geared head stock as against a belt driven headstock. Explain the function of a half nut during lathe operation with a neat sketch.(7 marks) 2(d) Name the accessories commonly used to enhance the lathe operation. Explain the function of a half nut during lathe operation with a neat sketch.(7 marks)

### solve any one question Q.3(a,b,c) &Q4(a,b,c)

3(a) What is the material of a lathe bed? Why?(3 marks) 3(b) Compare the benefits and limitations of three jaw chuck vis-a-vis a four jaw chuk.(4 marks) 3(c) Name the drilling operations. Explain counter boring and spot facing with neat sketches.(7 marks) 4(a) Calculate the change gears to cut a single start thread of 0.5 mm pitch on a centre lathe having a lead screw of 1 mm pitch.(3 marks) 4(b) Explain the specifications of a drilling machine.(4 marks) 4(c) With a block diagram, describe the main features of a horiziontal boring machine.(7 marks)

### solve any one question Q.5(a,b,c) &Q6(a,b,c)

5(a) Explain reaming and tapping with neat sketches.(3 marks) 5(b) Explain gang milling and straddle milling with neat sketches.(4 marks) 5(c) Give neat sketches of internal pull type broach and indicate the various terms relative to its teeth.(7 marks) 6(a) Explain the importance of conducting alignment tests on a machine tool.(3 marks) 6(b) Name the alignment tests required to be carried out on a milling machine.(4 marks) 6(c) Explain simple indexing and compound indexing in milling operations.(7 marks)

### solve any one question Q.7(a,b,c) &Q8(a,b,c)

7(a) Differentiate between up milling and down milling.(3 marks) 7(b) Differentiate between shaper and planer.(4 marks) 7(c) Sate the factors to be considered for the selection of a grinding wheel. Explain the importance of wjeel diameter.(7 marks) 8(a) Explain the specifications of a shaper.(3 marks) 8(b) Explain how workable reversal is obtained ina shaper.(4 marks) 8(c) Explain the specifications of a grinding wheel. Explain why a hard wheel is recommended for grinding a soft material and vice versa.(7 marks)

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