Introduction to Metallurgy MCQ Questions and Answers

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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Answer & Solution

Answer: Option D

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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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Answer & Solution

Answer: Option C

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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
Introduction to Metallurgy mcq question image

Introduction to Metallurgy mcq question image

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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Answer & Solution

Answer: Option A

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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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Answer & Solution

Answer: Option D

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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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Answer & Solution

Answer: Option A

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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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Answer & Solution

Answer: Option B

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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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Answer & Solution

Answer: Option B

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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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Answer & Solution

Answer: Option A

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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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Answer & Solution

Answer: Option C

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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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Answer & Solution

Answer: Option A

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Introduction to Metallurgy MCQ Questions and Answers | Metallurgical Engineering