Self-Assessment Questions

SELF-ASSESSMENT QUESTIONS

Short Answer Type Questions

On Mechanical Properties of Materials

1. What is meant by mechanical properties of materials? 

2. Why is the designer usually more concerned with the mechanical properties of materials than with their physical properties?

3. Distinguish between elasticity and plasticity.

4. Differentiate between ductility and malleability.

5. Define the terms brittleness and hardness.

6. What do you mean by toughness and stiffness?

7. Define any four technological properties of metals.

8. What are the factors affecting mechanical properties?

9. What is the effect of the following on the mechanical properties of the materials:

(a) Grain size, and (b) Heat treatment.

On Deformation of Metals

10. Distinguish between elastic and plastic deformation of a solid.

11. Define the terms slip and twinning.

12. State the Schmid's law.

13. What are the causes of twins?

On Fracture and Its Prevention

14. What is meant by fracture?

15. State the causes of fracture in a material.

16. What is brittle fracture?

17. What is ductile fracture?

18. Distinguish between brittle fracture and ductile fracture.

19. How can you prevent the brittle fracture?

20. How can you prevent the ductile fracture?

21. What is meant by fatigue fracture?

22. What is S-N diagram? What is the significance of it?

23. What are the factors affecting fatigue strength?

24. How can you prevent the fatigue fracture?

25. What is meant by creep fracture?

25. Sketch a creep curve explaining different stages of it.

27. What are the factors affecting creep?

On Mechanical Tests of Metals

28. How can you prevent the creep fractures?

29. Differentiate between destructive and non-destructive tests.

30. List the main parameters which may be determined in a tensile test.

31. What are the attractive features of Vickers hardness tests?

32. How does the Rockwell test differ from that of the others?

33. Why must Rockwell test numbers always include a letter, such as A, B, or C.

34. What are the main reasons for using notch impact tests?

35. What is the difference between Izod and Charpy impact testing methods.

36. Define the term notch sensitivity.