Solved Anna University Question Papers (Reg 2013 / Dec 2014)

Solved Anna University Question Papers

B.E./B.TECH. DEGREE EXAMINATION - NOVEMBER/DECEMBER 2014

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 meant by grain fineness number?

Grain fineness number is defined as the ratio between the total products and total percentages of sand retained on pan in each sieve.

2. Mention few applications of centrifugal casting:

Components such as water pipes, gears, bush bearings, fly wheels, piston rings, brake drums, gun barrels etc., can be made by centrifugal casting.

3. What is meant by Nuggets in electrical resistance welding?

The point at which the molten metal is created between for short period of time due to maximum heat generation is called nugget.

4. What are functions of flux used in welding electrode?

Fluxes are used in welding to prevent the atmospheric reaction and remove impurities.

5. Why is drop forging called so?

The upper die is fitted on the ram and the lower die is fitted on the anvil. Both the dies have impressions. Two rollers are fixed on the board. When both rolls rotate opposite to each other, it drives the board upward and lifts the ram using friction. When the rolls are released, the ram drops down i.e. dropped by gravitational force and produce a working stroke. That's why this type of forging is called drop forging.

6. What does angle of bite in rolling mean?

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. What is shear angle? Why is it given on punches and dies?

The angle about which the vertical lines tilt is called shear angle. Shear angle initiates the shearing to complete piercing or blanking on the workpiece. So, it is provided on punches and dies.

8. What is flanging?

Flanging is a process of bending the edges of sheet metals to 90°. It is also called edge bending or wiping-die bending.

9. What is polymerisation?

A polymer is made up of linking thousands of monomer. The process of obtaining large molecule by linking many monomers is called polymerization process.

10. List out any four types of adhesives used in adhesive bonding of plastics.

(i) Epoxies

(ii) Methyl Methacrylates

(iii) Silicone Adhesives

(iv) Urethanes.

Part B - (5 × 16 = 80 Marks)

11. (a)(i) Explain various properties required for the moulding sand.

Refer chapter 1.8.3 in Page 1.19.

(ii) Describe the constructional feature of cupola furnace.

Refer chapter 1.13.2 in Page 1.64.

Or

(b) Explain the various steps involved in sand core manufacturing.

Refer chapter 1.9.3 in Page 1.40.

12. (a) (i) Explain with a neat sketch the components of oxy-acetylene gas welding equipment.

Refer chapter 2.4.4 in Page 2.6.

(ii) Describe the process of electroslag welding and identify their major applications.

Refer chapter 2.7 in Page 2.24.

Or

(b) (i) Explain the process of rotary drive friction welding with its advantages and limitations.

Refer chapter 2.15 in Page 2.60.

(ii) Briefly explain the principle of operation, advantages and limitations of electron beam welding.

Refer chapter 2.13 in Page 2.54.

13. (a) (i) With suitable sketches describe indirect and direct extrusion.

Refer chapter 3.19.1.2 in Page 3.77 for indirect extrusion and chapter 3.19.1.1 in 3.76 for direct extrusion.

(ii) Draw a simple sketch showing rolling process and make a short note on deformation of grains in rolling.

Refer chapter 3.10 in Page 3.39. 

Or

(b) (i) Explain hot working and cold working with their advantages and limitations.

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 in detail about wire drawing.

Refer chapter 3.16.1 in Page 3.64.

14. (a) (i) What is super plastic forming? Explain with a neat sketch.

Refer chapter 4.14.8 in Page 4.55.

(ii) Enumerate rubber pad forming with a suitable sketch.

Refer chapter 4.14.2 in Page 4.44.

Or

(b) (i) Enumerate with a neat sketch any two types of stretch forming operations.

Refer chapter 4.11.1 in Page 4.33.

(ii) Describe magnetic pulse forming with a neat sketch.

Refer chapter 4.14.6 in Page 4.52.

15. (a) (i) What is transfer moulding? Discuss it advantages and limitations.

Refer chapter 5.5.2 in Page 5.31.

(ii) Explain positive, semi positive and flash type compression moulding.

Refer Pale 5.31.

Or

(b) Explain the various types of thermoforming method shaping thermoplastics.

Refer chapter 5.3 in Page 5.10.