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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-7 section-1

Each section contains 100 MCQs on Engineering Materials .
61
Cast iron is manufactured in
Discuss
Answer & Solution
Answer: Option B
Solution:
Cast iron is manufactured in Cupola
62
The molecules in a solid move
Discuss
Answer & Solution
Answer: Option D
Solution:
The molecules in a solid move Back and forth like tiny pendulums
63
Hardness of upper bainite (acicular structure) is about
Discuss
Answer & Solution
Answer: Option B
Solution:
Upper bainite is a microstructure in steel that forms at higher transformation temperatures compared to lower bainite, typically in the range of 350°C to 550°C.

It has an acicular structure consisting of parallel ferrite plates separated by cementite, giving it a distinctive needle-like appearance.

Because it forms at higher temperatures, carbon diffusion is more pronounced, leading to coarser carbide particles and lower hardness compared to lower bainite.

On the Rockwell C (RC) scale, upper bainite typically measures around RC 48, which is lower than the hardness of lower bainite (around RC 57) and much lower than untempered martensite (around RC 65 or higher).

This hardness level offers moderate strength with better toughness than harder microstructures.
64
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as
Discuss
Answer & Solution
Answer: Option A
Solution:
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as Allotropic change
65
A reversible change in the atomic structure of steel with corresponding change in the properties is known as
Discuss
Answer & Solution
Answer: Option C
Solution:
A reversible change in the atomic structure of steel with corresponding change in the properties is known as Allotropic change
66
Hardness of martensite is about
Discuss
Answer & Solution
Answer: Option A
Solution:
Hardness of martensite is about RC 65
67
A coarse grained steel
Discuss
Answer & Solution
Answer: Option A
Solution:
A coarse grained steel is less tough and has a greater tendency to distort during heat treatment
68
Which of the following pipes is least corrosion resistant?
Discuss
Answer & Solution
Answer: Option D
Solution:
Wrought iron is least corrosion resistant
69
Points of arrest for iron correspond to
Discuss
Answer & Solution
Answer: Option A
Solution:
Points of arrest for iron correspond to Stages at which allotropic forms change
70
The charge is fed into the blast furnace through the
Discuss
Answer & Solution
Answer: Option B
Solution:
The charge is fed into the blast furnace through the Throat