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Physical Metallurgy MCQ Questions and Answers | Metallurgical Engineering

Enhance your knowledge of Physical Metallurgy with this comprehensive collection of MCQ questions and answers. These MCQ questions and answers in Physical Metallurgy are specifically designed for students of Metallurgical Engineering who are preparing for the GATE Exam. Strengthen your preparation and excel in your studies with this valuable resource. Page-3 section-2

Each section contains 100 MCQs on Physical Metallurgy .
21
Match the names listed in Group I with the reactions listed in Group II.
Group I Group II
P. Eutectic 1. γ + β ⟶ α
Q. Peritectic 2. L ⟶ α + β
R. Peritectoid 3. L1 ⟶ L2 + α
S. Monotectic 4. L + β ⟶ α
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Answer & Solution
Answer: Option C
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22
Pb-Sn is an example
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Answer & Solution
Answer: Option B
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23
Atomic packing factor of BCC crystal structure is
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Answer & Solution
Answer: Option A
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24
Identify the attributes associated with dispersion hardened alloys.
P. Dispersoids do no dissolve in the matrix even at high temperature.
Q. Dispersoids are coherent with the matrix.
R. Dispersoids impart creep resistance to the alloy.
S. Dispersoids improve the corrosion resistance of the alloy.
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Answer & Solution
Answer: Option D
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25
Internal cracks in drawn bars are due to
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Answer: Option A
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26
Von Mises criterion for plastic yielding of a ductile metal predicts that the yield stress in uniaxial tension is related to that in pure torsion as
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Answer: Option B
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27
During decarburising of a plane carbon steel, the thickness of ferrite layer growth is proportional to
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Answer: Option B
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28
A steel specimen containing 0.2 wt.% C is carburized in an atmosphere that maintains a carbon content of 1.2 wt.% C at the surface of the specimen.
Given:
For carbon diffusion in austenite: D0 = 2.0 × 10-5 m2/s
Activation energy for diffusion, Q = 142 kj/mol
y erf(y)
0.85 0.7707
0.90 0.7970
0.95 0.8209
What is the depth (in (μm) from the surface of the specimen at which a composition of 0.4wt.% C is obtained after carburizing at 870°C for 10 h?
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Answer & Solution
Answer: Option D
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29
The plane strain fracture toughness (KIC) and yield strength of a material are $$100\,M{N^{ - \frac{3}{2}}}m$$   and 500 MN-2m respectively. The minimum plate thickness to determine KIC is . . . . . . . . cm.
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Answer: Option B
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30
Gold has surface free energy of 1.5 J.m-2 and grain boundary energy of 0.365 J.m-2. The groove angle that forms where a grain boundary intersects the free surface in a well annealed sample is
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Answer: Option C
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