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



Question: 3

_____ steel is normally subjected to tempering.

(A) Plastically deformed

(B) Normalised

(C) Annealed

(D) Quenched

Ans: D


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


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