Solved Anna University Question Papers (Reg 2013 / Dec 2015)

B.E./B.TECH. DEGREE EXAMINATION - NOVEMBER/DECEMBER 2015

Third Semester

Mechanical Engineering

ME 6302-MANUFACTURING TECHNOLOGY-I

(Common to Industrial Engineering and Industrial Engineering and Management) and Mechanical and Automation Engineering)

Time: Three hours      Maximum: 100 Marks

(Regulation 2013)

Answer ALL questions

Part A - (10 x 2 = 20 Marks)

1. What is ideal profile of a sprue?

The sprue profile which having straight edges to use it safe and easy to make is called ideal profile of a sprue.

2. What do you mean by core print?

A core print is an extra projection on the pattern. It supports the core.

3. Why shielding of weld area during welding is required?

Shielding is used to prevent atmospheric reaction between molten metal and atmosphere (prevention of oxidation).

4. How is the seam welding used as an application of spot welding?

The metal to be welded is moved between electrodes and electric pulses create spots of molten metal that overlap to form the continuous seam.

5. What do you mean by lateral extrusion?

The process of extruding the component in radial direction in a die cavity using single or multiple opposite simple punches is called lateral extrusion.

6. What do you mean by angle of bite?

The angle subtended by the centre of the roll with radial force in rolling operations is called angle of bite or angle of contact.

In other words, it can be defined as an angle between first contact of metal and radius of the roll. It joins the opposing rolls and the centres of them when metal is rolled.

7. List out test methods for testing formability of material.

1. Formability tests for bulk deformation.

2. Formability test for elastic-plastic deformation

3. Simulative tests for forming operation and

4. Full scale forming tests.

8. Distinguish between piercing and blanking.

9. What is the need for rotational moulding in manufacturing plastic components?

The rotational moulding is needed to make thin walled hollow parts.

10. Make a note on polymerization.

A polymer is made up of linking thousands of monomer. The process of obtaining large molecule by linking many monomers is called polymerization process. It is achieved by one of the two processing techniques. They are as follows.

1. Addition polymerization

2. Condensation polymerization.

Part B - (5 × 16 = 80 Marks)

11. (a) (i) Explain operation of cupola furnace with necessary sketch.

Refer chapter 1.13.2 in Page 1.64.

(ii) Explain any four casting defects, causes and remedies.

Refer chapter 1.18 in Page 1.93.

(b) (i) Explain the various types of pattern used in moulding making.

Refer chapter 1.5 in Page 1.2.

(ii) Enumerate the steps on sequence for producing Shell moulding. 

Refer chapter 1.14.1 in Page 1.73.

12. (a) (i) Explain the equipment of an Oxy-Acetylene gas welding. 

Refer chapter 2.4.4 in Page 2.6.

(ii) Explain about the equipment and operation of GTAW process. 

Refer chapter 2.6 in Page 2.21.

Or

(b) (i) Explain the variants of Thermit welding process.

Refer chapter 2.12.1 in Page 2.51.

(ii) Explain the resistance spot welding process with a neat sketch. 

Refer chapter 2.10.4 in Page 2.37.

13. (a) (i) Explain with neat sketches various types of rolling stand arrangement. 

Refer chapter 3.11.1-3.11.7 in Page 3.42-3.44.

(ii) Explain with a neat sketch the process of wire drawing.

Refer chapter 3.16.1 in Page 3.64.

Or

(b) (i) Discuss the advantages and limitations of hot working and cold working. 

Refer chapter 3.2.1.2 in Page 3.3 for advantages of hot working, chapter 3.2.1.3 in Page 3.3 for limitations of hot working and chapter 3.2.2.2 in Page 3.5 for advantages and limitations of cold working.

(ii) Explain the steps involved in drop forging with neat sketches.

Refer chapter 3.3.8 in Page 3.12.

14. (a) (i) Explain any one stretch forming method.

Refer chapter 4.11.1 in Page 4.33.

(ii) Explain the advantages and limitations of compound dies over progressive dies.

Refer Pages 4.16 & 4.17.

Or

(b) (i) Briefly explain with a neat sketch hydroforming.

Refer chapter 4.14.1 in Page 4.42.

(ii) Elucidate process variables in explosive forming.

Refer Page 4.51.

15. (a) (i) Explain how plastic sheets are manufactured by thermo forming method. 

Refer chapter 5.3.10 in Page 5.27.

(ii) Explain the process of transfer moulding and its applications.

Refer chapter 5.4.2 in Page 5.32.

Or

(b) (i) Enumerate various methods of bonding thermoplastics. Refer chapter 5.7 in Page 5.36.

(ii) Enumerate injection moulding of plastic products.

Refer chapter 5.3.1 in Page 5.10.