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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-1 section-3

Each section contains 100 MCQs on Engineering Materials .
1
The blade of a power saw is made of
Discuss
Answer & Solution
Answer: Option B
Solution:
The blade of a power saw is made of High Speed Steel (HSS) to mainly cut copper, steel, aluminum and other materials except high-strength steel.
2
German silver is an alloy of
Discuss
Answer & Solution
Answer: Option C
Solution:
German Silver is a copper alloy with nickel and often zinc.
The usual formulation is 60% copper, 20% nickel and 20% zinc
3
Specify the sequence correctly
Discuss
Answer & Solution
Answer: Option C
Solution:
the correct sequence is described are under as:
Stress relief, recrystallization, grain growth
4
Cementite consist of
Discuss
Answer & Solution
Answer: Option D
Solution:
Cementite consist of 6.67% carbon and 93.33% iron It has an orthorhombic crystal structure.
5
Preheating is essential in welding
Discuss
Answer & Solution
Answer: Option A
Solution:
Preheating minimizes the temperature difference between the welding arc and the base material. .
Slowing the cooling rate also allows hydrogen to escape the weld puddle as it hardens to help minimize cracking.
preheating introduces the necessary heat into the weld area to ensure proper penetration.
6
Which of the following material has nearly zero coefficient of expansion?
Discuss
Answer & Solution
Answer: Option C
Solution:
Invar is a solid solution, it is a single-phase alloy,
It consisting of around 36% nickel and 64% iron.
And uniquely it has nearly zero coefficient of expansion.
7
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.
Discuss
Answer & Solution
Answer: Option B
Solution:
When filing or machining cast iron makes our hands black, then it shows that free graphite is present in cast iron.
8
When medium carbon steel is heated to coarsening temperature
Discuss
Answer & Solution
Answer: Option C
Solution:
When medium carbon steel is heated to coarsening temperature the grain size increases very rapidly
9
Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?
Discuss
Answer & Solution
Answer: Option C
Solution:
It is a mild deoxidant acting as a cleanser taking the sulphur and oxygen out of the melt into the slag.
It increases the harden ability and tensile strength but decreases ductility.
It combines with sulphur to form globular manganese sulphides, essential in free cutting steels for good machinability.
10
Recrystallization temperature is one
Discuss
Answer & Solution
Answer: Option B
Solution:
Recrystallization temperature is one, at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated.