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Engineering Materials MCQ Questions & Answers | Mechanical Engineering

Learn Engineering Materials MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Engineering Materials MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-2 section-4

Each section contains 100 MCQs on Engineering Materials .
11
Materials after cold working are subjected to following process to relieve stresses
Discuss
Answer & Solution
Answer: Option D
Solution:
A heat treatment used to eliminate part or all of the effects of cold working.
Cold working - Deformation of a metal below the recrystallization temperature.
During cold working, the number of dislocations increases, causing the metal to be strengthened as its shape is changed.
12
Argentite is the principal ore or raw material for
Discuss
Answer & Solution
Answer: Option D
Solution:
Silver is extracted from the ore-argentite
13
Melting point of iron is
Discuss
Answer & Solution
Answer: Option A
Solution:
Melting point of iron is 1539°C
14
The metallic structure of mild steel is
Discuss
Answer & Solution
Answer: Option A
Solution:
The metallic structure of mild steel is Body Centered Cubic (BCC). In a BCC structure, each atom is positioned at the center of a cube and has eight nearest neighbors at the corners of the cube.

Therefore, the correct answer is Option A: Body centered cubic.
15
The basic constituents of Hastelloy are
Discuss
Answer & Solution
Answer: Option B
Solution:
The basic constituents of Hastelloy are 22% chromium, 13% molybdenum, and less than 3% iron.
16
The crystal structure of gamma iron is
Discuss
Answer & Solution
Answer: Option B
Solution:
The crystal structure of gamma iron is Face centered cubic.
The gamma iron is shown in figure:
Engineering Materials mcq solution image
17
The coke in the charge of blast furnace
Discuss
Answer & Solution
Answer: Option C
Solution:
The coke in the charge of blast furnace Supplies heat to reduce ore and melt the iron.
The coke is a source of carbon monoxide which will reduce the iron oxide in the ore to iron and the carbon monoxide oxidizes to carbon dioxide.
The limestone acts as a flux to remove other impurities and help the iron physically separate from the rest of the burden.
18
The crystal of alpha iron is
Discuss
Answer & Solution
Answer: Option A
Solution:
The crystal of alpha iron is Body centered cubic.
Alpha iron is shown in figure:
Engineering Materials mcq solution
19
Which of the following alloys does not contain tin?
Discuss
Answer & Solution
Answer: Option A
Solution:
White metal does not contain tin
20
Railway rails are normally made of
Discuss
Answer & Solution
Answer: Option C
Solution:
Railway rails are subject to very high stresses, that's why it is made out from high carbon steel