Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering Page-9 section-1

81.
Which of the following manufacturing processes is not used for producing fine grained metals?

A. Electrodeposition

B. Czochralski method

C. Equi-Channel Angular Pressing (ECAP)

D. Sintering of milled powders

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82.
In the eutectoid steel, which one of the following structures does not form during continuous cooling?

A. Fully pearlitic

B. Pearlitic + bainitic

C. Fully bainitic

D. Martensitic

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83.
Spheroidal graphite is obtained incast irons by

A. inoculating the melt with ferrosilicon

B. adding nickel to the melt in the form of round shots

C. treating the melts of controlled compositions with magnesium

D. annealing of flake graphite cast iron

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84.
Martensite in steels is

A. an interstitial solid solution of C in alpha iron

B. a supersaturated interstitial solution of C in BCT iron

C. a supersaturated solid solution of C in gamma iron

D. a very finely dispersed lamellar structure

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85.
Match the desired mechanical properties listed in Group I with the microstructural features listed in Group II.

Group I Group II

P. Creep resistance 1. Fine grained two-phase microstructure

Q. Elastic modulus enhancement 2. Single crystal

R. Superplasticity 3. Coherent precipitates

S. Increased strength 4. Glass fibres in epoxy

A. P-3, Q-4, R-2, S-1

B. P-1, Q-2, R-3, S-4

C. P-2, Q-4, R-1, S-3

D. P-1, Q-4, R-2, S-3

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86.
Other parameters remammg same, the recrystallisation temperature of an alloy is lowered, when

A. strain rate is increased

B. grain size is increased

C. prior cold deformation is increased

D. not affected by any of the above parameters

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87.
Match the following.

Group-I Group-II

P. Hardness of martensite in steels 1. Extent of cold working

Q. Hardness of pearlite in steels 2. Particle size of the resulting carbide

R. Hardness of tempered martensite in steels 3. Interlamellar spacing

S. Hardness of α° brasses 4. Weight per cent of carbon

A. P-4, Q-3, R-1, S-2

B. P-4, Q-3, R-2, S-1

C. P-3, Q-4, R-1, S-2

D. P-1, Q-2, R-3, S-4

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88.
Driving force for grain growth after completion of recrystallisation is

A. stored energy of cold work

B. vacancy concentration

C. dislocation density in the crystal

D. grain boundary curvature

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89.
In an Ellingham diagram, the standard free energy change ΔG° for the oxidation reaction of a metal M given by : xM(s) + O₂(g) ⟶ MxO₂(s), is plotted as a function of temperature. The slope of this line is positive because

A. ΔS° is positive

B. ΔS° is negative

C. ΔH° is positive

D. ΔH° is negative

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90.
Example/examples of eutectoid system is/are

A. Ag-Cd, Ag-Ga, Pb-Sn

B. Ag-Cd, Ag-Ga, Al-Mn, Bi-Cd

C. Ag-Cd, Ag-Ga, Al-Mn, Au-Zn, Pb-Sn

D. Ag-Cd, Ag-Ga, Al-Mn, Au-Zn, Cu-Zn, Cu-Sn

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Group I	Group II
P. Creep resistance	1. Fine grained two-phase microstructure
Q. Elastic modulus enhancement	2. Single crystal
R. Superplasticity	3. Coherent precipitates
S. Increased strength	4. Glass fibres in epoxy

Group-I	Group-II
P. Hardness of martensite in steels	1. Extent of cold working
Q. Hardness of pearlite in steels	2. Particle size of the resulting carbide
R. Hardness of tempered martensite in steels	3. Interlamellar spacing
S. Hardness of α° brasses	4. Weight per cent of carbon

Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering

81. Which of the following manufacturing processes is not used for producing fine grained metals?

Answer & Solution

82. In the eutectoid steel, which one of the following structures does not form during continuous cooling?

Answer & Solution

83. Spheroidal graphite is obtained incast irons by

Answer & Solution

84. Martensite in steels is

Answer & Solution

Answer & Solution

86. Other parameters remammg same, the recrystallisation temperature of an alloy is lowered, when

Answer & Solution

Answer & Solution

88. Driving force for grain growth after completion of recrystallisation is

Answer & Solution

89. In an Ellingham diagram, the standard free energy change ΔG° for the oxidation reaction of a metal M given by : xM(s) + O2(g) ⟶ MxO2(s), is plotted as a function of temperature. The slope of this line is positive because

Answer & Solution

90. Example/examples of eutectoid system is/are

Answer & Solution

Read More Section(Physical Metallurgy)

81.
Which of the following manufacturing processes is not used for producing fine grained metals?

82.
In the eutectoid steel, which one of the following structures does not form during continuous cooling?

83.
Spheroidal graphite is obtained incast irons by

84.
Martensite in steels is

86.
Other parameters remammg same, the recrystallisation temperature of an alloy is lowered, when

88.
Driving force for grain growth after completion of recrystallisation is

89.
In an Ellingham diagram, the standard free energy change ΔG° for the oxidation reaction of a metal M given by : xM(s) + O₂(g) ⟶ MxO₂(s), is plotted as a function of temperature. The slope of this line is positive because

90.
Example/examples of eutectoid system is/are