PH 233 — APPLIED MATERIALS SCIENCE: Fourth Semester, Mechanical Engineering Question Paper

Anna University, Chennai.

B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2003.

Fourth Semester

Mechanical Engineering

PH 233 — APPLIED MATERIALS SCIENCE

Time : Three hours Maximum : 100 marks

Answer ALL questions.

Add neat diagrams wherever necessary.

PART A — (10 x 2 = 20 marks)

1. What are Miller Indices?

2. Differentiate between a primitive and a non–primitive cell.

3. Differentiate between Brittle fracture and Ductile fracture.

4. Define the term creep.

5. What is a phase diagram?

6. What are the influences of other elements on plain carbon steels?

7. Write the compositions and applications of constantan.

8. What important characteristics should the bearing metals possess?

9. What is sub–zero treatment of steel?

10. What is ‘‘Patenting’’?

PART B — (5 ? 16 = 80 marks)

11. Show that in a cubic crystal the spacing between consecutive parallel planes of Miller indices (h k l) is given by . (16)

12. (a) (i) Define atomic packing factor. (1)

(ii) Determine the packing factor for SC, BCC and FCC structure. (5 + 5 + 5)

Or


(b) (i) Describe a Line Defect in detail explaining the principles of Edge dislocation and screw dislocation. (13)

(ii) What is a Burger vector? (3)

13. (a) (i) Explain with a neat diagram the different stages in creep curve. (12)

(ii) State the different causes of fatigue failure. (4)

Or

(b) Explain the Griffith fracture theory of metals. (16)

14. (a) Explain in detail the effects of Carbon, Silicon, Manganese, Nickel, Chromium and Copper elements in cast iron. (16)

Or

(b) Describe in detail the ore, properties and uses of Copper, Aluminium and Tin. (12 + 4)

15. (a) Write short notes on the following :

(i) Nitriding. (5)

(ii) Carburising. (5)

(iii) Cyaniding. (6)

Or

(b) Write short notes on the following :

(i) Flame hardening. (5 )

(ii) Induction hardening. (5)

(iii) Laser hardening. (5 )

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