ME2253 Engineering Materials and Metallurgy Anna University Question bank, question paper pervious year question paper for Unit 1 unit 2 unit3 unit 4 unit 5,important 2 marks and 16 marks questions

Subject Name : Engineering Materials and Metallurgy
Subject Code: ME2253

1. What is the meaning of material science?
2. How are materials classified?
3. In what respect 'Conductors' differ from ‘Semiconductors’?
4. Give the classification of magnetic materials. Explain   
     briefly the following mechanical properties of metals
5. Explain Elasticity, Plasticity, Ductility, Malleability and Hardness.
6. Write a short note on 'Superconductivity'
7. Explain briefly the process of crystallization of pure metal.
8. What do you mean by 'Dendritic solidification’? Show with the help of a        
    diagram various step involved in the formation of crystal.
9. Explain briefly the following:
(i)     Unit cell                                         (ii)   Space lattice
(iii)   Space lattice groups.
10. What do you mean by 'Allotropy of metals' '? Explain.
11. State the effect of grain size oil properties of metals.
12. Define the term 'Solid solution'. Give five examples of solid solutions.
13. Describe briefly with neat diagrams the following
i) Substitution solid solution ii)        Interstitial solid solution
 14. Write a short note on 'Intermediate phases'.
 15. Define an 'alloy'.
 16. What is an equilibrium diagram'? State its importance and objectives.
  17. Define the following terms as applied to equilibrium diagram:
(1)    System                                          (ii)   Component
(iii)   Phase                                             (iv)  Structural constituents.
   18. State 'Gibb's phase rule'. What is its importance/utility ?
   19. How are equilibrium diagrams classified ?
   20. Explain with neat diagrams any two of the equilibrium diagrams for the following cases:
(i) Two metals (or components) completely soluble in the liquid and solid states.
(ii) Two metals (or components) completely soluble in the liquid state but completely insoluble in the solid
(iii)Two metals (or components) completely soluble in the liquid state   
     but only  partly soluble in the solid state
(iv) An alloy subjected to 'Peritectic transformation

21. Write a short note on 'Ternary equilibrium diagram'
23. Define the term "heat treatment" and state its objectives.
24. Enumerate the constituents of iron and steel and explain any three of them in detail. What is "austenite" and how is it formed ?
25. What is "martensite" and how is it formed?
26. Draw the 'iron-carbon equilibrium diagram' and explain it.
27. What is a TTT diagram ?
28. Enumerate various heat-treatment processes and explain any two of them briefly.
29. State the objects of "annealing".
30.Explain briefly the following annealing processes.
(i)    Full annealing                                (ii)   Isothermal annealing
(iii)  Sub-critical annealing.
31. What is accomplished by normalising ?
32. Describe the "critical rate" of quenching.
33.Name and explain the various quenching media used for heat treatment of steel.
34. Explain briefly the following hardening methods :
(i)    Martempering                               (ii)   Austempering What is the difference between "hardenability" and "hardening power" ?
35. Describe with a neat sketch Jominy hardenability test.
36.Write a short note on 'Sub-zero treatment of steel'.
37. What is the purpose of tempering?
38. What are temper coloures and how are they used
State the effect of tempering temperature oil the mechanical properties of steel.
39. What do you mean by "Age hardening"?
40. Explain briefly the "Pack hardening" process of case hardening.
41. Describe briefly the following processes of surface hardening :
ii)    Nitriding                                        (ii)   Flame hardening, and
(iii)      Induction hardening.
42. Enumerate the defects caused due to heat treatment of steels. Explain briefly three of the following
i)  Oil and gas tired furnaces  (ii)     Continuous furnace

43.What is temper embrittlenient ? How is it avoided ?
44. Explain why :
(i)    Carburising heat treatment is generally done on low carbon steels
(ii)            Alloying elements in general increase hardenability of steels.
(iii)           Metals under-going cyclic loading, are case-hardened.
45. What are the three steps in an age-hardening (heat) treatment ? Describe what happens in each step
46. Write short note on
(i)          TTT curves                                    (ii)   Age hardening heat is
(iii)        Normalizing.
47. Why must water quenching be used to harden plain carbon steels, while some alloy steels can be harde
48. What factors have to be considered in determining the type of quenching to be used to harden a steel
49. Write type of heat treatment required for
(i)          Large forg~ings                             (ii)   Large castings
(iii)        Steels containing more than 0.5% carbon.       (V)    Steels containing lee;
50. Why it is undesirable to case-harden screw threads ?
51. Determine the grain-diameter of an ASTM number ?.
52. (i)    Explain the various purposes of heat treatment.
(ii)       Describe the flame hardening process and its application.
(iii)           Explain the process of annealing.
53. Distinguish between the hardness and hardenability of a steel. State the factors which affect hardenabil
54. (i)    Define the term heat treatment. Why are the steels heat treated ?
(ii)   Discuss the major defects in steel due to faulty heat treatment.
55. Distinguish between full annealing and process annealing.
56.What is the minimum carbon content percentage required in steel so that it may respond to hardening t
57.What are the objectives of heat treatment of metals ? What care one must take while high treating to ai
58.Explain the theory of 'Tempering'. What are the effects of tempering on the mechanical properties of
59.How does 'cyaniding' differ from 'liquid carburizing' ?
60.Give the composition, properties and uses of any two of the following.
(i)    Grey cast iron,                              (ii)   Mottled Cast iron,
(iii)   Nodular cast iron                          (iv)  Malleable cast iron.
61.How is wrought iron manufactured from pig iron ? Explain the process step-wise.
62.Explain the 'Aston Process' for manufacturing wrought iron.
63.Enumerate various methods of manufacturing steel and explain any one of them in detail.
64.Explain any two of the following methods of manufacturing steel :
i)     Cementation process;                    (ii)   Bessemer process;
(iii)   Open hearth process;                    (iv)  Duplex process;
(v)    Kaldo process.
65.State advantages and disadvantages of 'Bessemer process' over Open  
    hearth process'.
66.Explain the various steps involved in L.D process of manufacturing steel.
67.State composition, properties and uses of carbon steels.
68.State the comparison of cast iron, wrought iron, mild steel and hard steel.
70.What do you accomplish by adding alloying elements to steel ?
71.State the effects of adding following alloying elements to steel: Nickel,  
     Chromium, Manganese, Vanadium, Tungsten, Silicon and Copper.
72.Give the composition, properties and uses of the following alloy steels :  
       High speed steel, Silicon steel, Stainless steel.
Vanadium steel and Tungsten steel.
73.Enumerate the physical and mechanical properties of aluminium.
74.State the importance of commercially pure aluminium as a general  
     engineering material.
75.How is copper manufactured '?
76.What are the commercial alloys of aluminium? Briefly describe their  
     composition and uses.
77.What are the typical alloys of copper used in engineering'? Describe
    briefly their composition and uses.
78.What are the pronounced effects of beryllium on the physical properties
    of copper'?
79.What are the compositions, structure and characteristics of copper tin
     bronzes ? Why are these alloys used for springs ?
80.What are the requirements of an alloy to be used as a bearing metal '?
81.What is babbit ?
82.Discuss the effect on corrosion resistance of copper by increasing additions of :
(i)     zinc                                                (ii)    tin
(iii)   nickel.
83.How are properties of aluminium affected by the inclusion of
       (i) copper, and (ii) silicon as alloying elements ?

84.Enumerate the tests you will carry out for identification of metals and alloys.
85.Explain the procedure for preparing the specimen for micro-examination.
86.Describe with a neat diagram the construction and working of a metallurgical microscope. State its limitations also.
87.Explain an 'Electron microscope' in respect of the following    
    Principle of operation, preparation of specimen, construction   
    and operation, important ant features and limitations.
88.List the purposes for which materials are tested.
89.How do you classify tests on materials ?
90.Enumerate various methods used for non-destructive testings and explain in detail any two of them.
91.Describe briefly any two of the following non-destructive tests
92.Name the important mechanical test which give valuable information  
    about metals and alloys.
93.What does impact test signify ? Explain with necessary formulations,  
    the procedures to be adopted in the impact test. conducted on a pendulum  
    type impact testing machine.
94.What are different hardness tests of interest to the testing engineer under
     various situations ?
95.Explain the Brinell hardness testing of mild steel specimen.
96.What is  a 'rebound test' ? How is it carried out ?
97.What is a fatigue failure ? How is a fatigue test carried out?
98.Explain briefly the procedure of conducting a torsion test.
99.What is creep ?
100. Draw a typical creep curve and explain the different stages of creep.