7000+ Objective Questions on Physical Metallurgy - 1
Question: 1
The hardenability of steels decreases with
(A) Increase in strength
(B) Decrease in strength
(C) Increase in solutionising temperatire
(D) Decrease in dislocation density
Ans: B
Decrease in strength
Question: 2
Which of the following case hardening processes for steel produces a hard case without quenching or any further heat treatment is
(A) Gas carburising
(B) Liquid carburising
(C) Pack carburising
(D) Nitriding
Ans:D
Nitriding
Question: 3
_____ steel is normally subjected to tempering.
(A) Plastically deformed
(B) Normalised
(C) Annealed
(D) Quenched
Ans: D
Quenched
Question: 4
Martensite has a _____ crystal lattice structure.
(A) Close packed hexagonal
(B) Face centered cubic
(C) Body centered cubic
(D) Body centered tetragonal
Ans: D
Body centered tetragonal
Question: 5
The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.
(A) Carbon
(B) Chromium
(C) Phosphorous
(D) Silicon
Ans: A
Carbon
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