Introduction to Metallurgy MCQ Questions and Answers | Metallurgical Engineering Page-4 section-1

31.
Cemented carbide cutting tools are
P. made by casting
Q. made of mainly WC and cobalt
R. made of Fe₃C and cobalt
S. made by liquid phase sintering

A. P, Q

B. Q, R

C. P, R

D. Q, S

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32.
The minimum energy required to impose a plastic strain of ε to a metal having unit volume and a constant flow stress = σ is

A. σε

B. 2 σε

C. $$\frac{{\sigma \in }}{2}$$

D. $$\frac{{3\sigma \in }}{4}$$

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33.
Thin layer of material B (of total amount m) is plated on the end faces of two long rods of material A. These are then joined together on the plated side (see the figure below) and heated to a high temperature. Assuming the diffusion coefficient of B in A is D, the composition profile CB along the rod axis x after a time t is described by

A. $${C_B} = \frac{m}{{2\sqrt {\pi Dt} }}\exp \left[ { - \frac{{{x^2}}}{{4Dt}}} \right]$$

B. $${C_B} = \frac{m}{{2\sqrt {\pi Dt} }}erf\left[ { - \frac{{{x^2}}}{{4Dt}}} \right]$$

C. $${C_B} = \frac{m}{{2\sqrt {\pi Dt} }}\left[ {1 - erf\left( {\frac{{{x^2}}}{{4Dt}}} \right)} \right]$$

D. $${C_B} = \frac{m}{{2\sqrt {\pi Dt} }}t$$

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34.
An Fe/graphite diffusion couple is annealed at 1273 K. The carbon content (in mass %) on the Fe side of the Fe/graphite diffusion couple will be close to

A. 0.5

B. 1

C. 1.6

D. 6.7

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35.
In TEM electron . . . . . . . . during characterization of sample

A. transmitted through the sample

B. reflected from the sample

C. refracted

D. none of these

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36.
During solid state sintering of powder, the following mechanisms can be active.

A. Evaporation and condensation

B. Solid state diffusion process

C. Liquid formation in grain boundaries

D. Creation of more dislocations

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37.
If σ and ε are true stress and true strain, respectively, the maximum true uniform strain that can be imparted to a material obeying, σ = 1050 ε^0.25 is

A. 0.15

B. 0.25

C. 0.35

D. 0.45

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38.
Match the commonly used manufacturing process for the following products.

A. Thoriated nickel wire 1. Single crystal growing

B. Aircraft turbine blade made form a nickel based super alloy 2. Sand casting

C. Automobile crank shaft made for ductile iron 3. Powder metallurgy

D. Silicon wafers used in the electronic in dustry 4. Investment casting

A. A-1, B-4, C-2, D-3

B. A-4, B-3, C-2, D-1

C. A-1, B-4, C-3, D-2

D. A-2, B-4, C-3, D-1

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39.
During the roasting of sulfide ore a metal M. the possible solid phased are M. MS. MO and MSO₄. Assuming that both SO₂ and O₂ are always present in the roaster. The solid phases that can co-exist at thermodynamic equilibrium are

A. M, MS, MO, MSO₄

B. M, MO, MSO₄

C. MS, MO, MSO₄

D. M, MSO₄

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40.
Match the following.

Group 1 Group 2

P. Grain refinement of aluminium 1. Magnesium

Q. Improvement of fluidity of cast iron 2. Titanium

R. Refinement of graphite flakes in cast iron 3. Phosphorous

S. Removal of dissolved hydrogen from molten aluminium 4. Ferro-silicon

5. Chlorine

A. P-2, Q-3, R-4, S-5

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

C. P-2, Q-4, R-1, S-5

D. P-3, Q-5, R-4, S-2

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A. Thoriated nickel wire	1. Single crystal growing
B. Aircraft turbine blade made form a nickel based super alloy	2. Sand casting
C. Automobile crank shaft made for ductile iron	3. Powder metallurgy
D. Silicon wafers used in the electronic in dustry	4. Investment casting

Group 1	Group 2
P. Grain refinement of aluminium	1. Magnesium
Q. Improvement of fluidity of cast iron	2. Titanium
R. Refinement of graphite flakes in cast iron	3. Phosphorous
S. Removal of dissolved hydrogen from molten aluminium	4. Ferro-silicon
	5. Chlorine

Introduction to Metallurgy MCQ Questions and Answers | Metallurgical Engineering

31. Cemented carbide cutting tools are P. made by casting Q. made of mainly WC and cobalt R. made of Fe3C and cobalt S. made by liquid phase sintering

Answer & Solution

32. The minimum energy required to impose a plastic strain of ε to a metal having unit volume and a constant flow stress = σ is

Answer & Solution

Answer & Solution

34. An Fe/graphite diffusion couple is annealed at 1273 K. The carbon content (in mass %) on the Fe side of the Fe/graphite diffusion couple will be close to

Answer & Solution

35. In TEM electron . . . . . . . . during characterization of sample

Answer & Solution

36. During solid state sintering of powder, the following mechanisms can be active.

Answer & Solution

37. If σ and ε are true stress and true strain, respectively, the maximum true uniform strain that can be imparted to a material obeying, σ = 1050 ε0.25 is

Answer & Solution

Answer & Solution

39. During the roasting of sulfide ore a metal M. the possible solid phased are M. MS. MO and MSO4. Assuming that both SO2 and O2 are always present in the roaster. The solid phases that can co-exist at thermodynamic equilibrium are

Answer & Solution

40. Match the following. Group 1 Group 2 P. Grain refinement of aluminium 1. Magnesium Q. Improvement of fluidity of cast iron 2. Titanium R. Refinement of graphite flakes in cast iron 3. Phosphorous S. Removal of dissolved hydrogen from molten aluminium 4. Ferro-silicon 5. Chlorine

Answer & Solution

31.
Cemented carbide cutting tools are
P. made by casting
Q. made of mainly WC and cobalt
R. made of Fe₃C and cobalt
S. made by liquid phase sintering

32.
The minimum energy required to impose a plastic strain of ε to a metal having unit volume and a constant flow stress = σ is

34.
An Fe/graphite diffusion couple is annealed at 1273 K. The carbon content (in mass %) on the Fe side of the Fe/graphite diffusion couple will be close to

35.
In TEM electron . . . . . . . . during characterization of sample

36.
During solid state sintering of powder, the following mechanisms can be active.

37.
If σ and ε are true stress and true strain, respectively, the maximum true uniform strain that can be imparted to a material obeying, σ = 1050 ε^0.25 is

39.
During the roasting of sulfide ore a metal M. the possible solid phased are M. MS. MO and MSO₄. Assuming that both SO₂ and O₂ are always present in the roaster. The solid phases that can co-exist at thermodynamic equilibrium are

40.
Match the following.

Group 1 Group 2

P. Grain refinement of aluminium 1. Magnesium

Q. Improvement of fluidity of cast iron 2. Titanium

R. Refinement of graphite flakes in cast iron 3. Phosphorous

S. Removal of dissolved hydrogen from molten aluminium 4. Ferro-silicon

5. Chlorine