Jawaharlal Nehru Technological University Hyderabad

Jawaharlal Nehru Technological University Hyderabad B.Tech III MACHINE TOOLS Previous Question Paper (August/September - 2024 - R13)

B.Tech | III | I | R13 | August/September - 2024

Answer PaperPaper Code: 115EEMaximum Marks: 75Time: 3 Hours

Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.

Part A

125 marks

How is tool life defined? Explain the factors affecting tool life.

2 marks

Answer

Tool life is defined as the actual cutting time a tool can perform between two successive sharpenings. Factors affecting tool life include cutting speed (the most significant factor), feed rate, depth of cut, tool geometry (rake and clearance angles), tool material, workpiece material, and the use of cutting fluids.

What assumptions were made by Merchant in arriving at his famous Merchant’s theory?

3 marks

Answer

Merchant's theory assumes that the cutting edge is perfectly sharp, the tool is a single-point cutting tool with a defined rake angle, the deformation occurs in a single plane (shear plane), the material behaves as a rigid-plastic solid, and the cutting process is continuous without a built-up edge.

What are the different types of work holding devices used on Lathe machine?

2 marks

Answer

Differentiate between Turret and Capstan lathes.

3 marks

Answer

State the functions of clapper box in shaper.

2 marks

Answer

Describe the differences between a planer and a shaper.

3 marks

Answer

List out the merits of indexing method on milling machine.

2 marks

Answer

What is the difference between pull broaching and push broaching? Explain.

3 marks

Answer

List out the advantages of centreless grinding.

2 marks

Answer

How to specify grinding machine?

3 marks

Answer

Part B

210 marks

A turning operation has to be performed on an aluminum rod of diameter 50 mm and length 300mm. The Spindle speed of lathe is given to be 500 RPM. The feed and depth of cut are 0.15mm/rev and 0.3 mm respectively. Draw a neat sketch of the turning operation described above. Find out the cutting speed in mm/s and the volumetric material removal rate (MRRv).

6 marks

Answer

Practically all cutting fluids presently in use fall into one of four categories – what are they? Explain in detail.

4 marks

Answer

310 marks

What is the Merchant’s Force Circle used for? Explain the procedure to construct the Merchant’s force circle diagram, with the help of a neat sketch.

5 marks

Answer

Explain various types of cutting tool materials and its importance in detail.

5 marks

Answer

410 marks

Explain various principle features of automatic lathes in detail.

5 marks

Answer

Explain the working principle of a lathe and write its specifications in detail.

5 marks

Answer

510 marks

Contrast the capstan and turret lathes with centre lathes in detail.

5 marks

Answer

Describe the procedure of cutting external threads on a cylindrical bar in a Lathe machine.

5 marks

Answer

610 marks

Explain the working principle of a planning machine with neat sketch and write its principal parts.

5 marks

Answer

Explain various types of operation to be performed in boring machine in detail.

5 marks

Answer

710 marks

Describe the operation of a Deep hole drilling machine, with a schematic diagram in detail.

5 marks

Answer

Explain various types of operations performed by using shaper in detail.

5 marks

Answer

810 marks

Compare and contrast the grinding, lapping and honing operations with respect to the surface finish, applications, advantages and disadvantages.

5 marks

Answer

What do you mean by indexing? Explain various methods of indexing in detail.

5 marks

Answer

910 marks

With the help of a simple diagram, explain the role of each element of milling cutter.

5 marks

Answer

Bring out the differences between Lapping and Honing in detail.

5 marks

Answer

1010 marks

Sketch and explain the tool and cutter grinding machine in detail.

5 marks

Answer

What are the various factors to be considered in selection of a grinding wheel? Discuss each in detail.

5 marks

Answer

1110 marks

Explain different types of bonds used in making a grinding wheel.

5 marks

Answer

Explain the method of Re-sharpening of single point cutting tools in tool and cutter grinder.

5 marks

Jawaharlal Nehru Technological University Hyderabad B.Tech III MACHINE TOOLS Previous Question Paper (August/September - 2024 - R13)

Part A

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Part B

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

Answer

About this paper

Other papers in MACHINE TOOLS