41. The structure-sensitive properties are
P. Elastic modulus
Q. Yield strength
R. Melting point
S. Fracture strength
P. Elastic modulus
Q. Yield strength
R. Melting point
S. Fracture strength
42. Slipping system for FCC
43. Match the following.
P. Portevin-Le Chatlier effect
1. Dislocation pile up
Q. Bauschinger effect
2. Internal friction
R. Elastic after effect
3. Precipitation hardening
S. Modulus effect
4. Dynamic strain ageing
| P. Portevin-Le Chatlier effect | 1. Dislocation pile up |
| Q. Bauschinger effect | 2. Internal friction |
| R. Elastic after effect | 3. Precipitation hardening |
| S. Modulus effect | 4. Dynamic strain ageing |
44. A liquid alloy of the eutectic composition (L) undergoes the eutectic reaction to give α and β phases of compositions a and b respectively. The ratio of the relative amounts of α and β phases is
45. Which one of the following techniques does not require quenching to obtain final case hardness?
46. Cu5Zn8 is the complex cubic structure of gama brass is called electron compound under which category
47. A steel contains 38.5 mass % pro-eutectoid ferrite and 61.3 mass % austenite at eutectoid temperature (723°C). The carbon content of steel, in mass %, is
48. Stainless steel A has a stacking fault energy of 8 mJ.m-2 and stainless steel B has a stacking fault energy of 45 mJ. m-2. The correct statement out of the following are.
P. A will have a wider stacking faults than B
Q. A will strain harden more rapidly than B
R. A and B will develop similar type of substructure
S. A and B will have the same temperature dependence of flow stress.
P. A will have a wider stacking faults than B
Q. A will strain harden more rapidly than B
R. A and B will develop similar type of substructure
S. A and B will have the same temperature dependence of flow stress.
49. Match the following fractographic features with the type of fracture with which they are associated.
P. Striations
1. Ductile fracture
Q. Separated grain facets
2. Brittle fracture
R. Dimples
3. Fatigue fracture
S. Facets, river pattern
4. Intergrannular fracture
| P. Striations | 1. Ductile fracture |
| Q. Separated grain facets | 2. Brittle fracture |
| R. Dimples | 3. Fatigue fracture |
| S. Facets, river pattern | 4. Intergrannular fracture |
50. According to Hume-Rothery rules, extensive solid solubility between elements X and Y is promoted by the two factors in the following list.
P. Same crystal structure of Z and Y.
Q. Large atomic size difference (> 20%) between X and Y.
R. Same valance of X and Y.
S. Large difference in melting points of X and Y.
P. Same crystal structure of Z and Y.
Q. Large atomic size difference (> 20%) between X and Y.
R. Same valance of X and Y.
S. Large difference in melting points of X and Y.
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