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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-4

Each section contains 100 MCQs on Engineering Materials .
1
The following types of materials are usually the most ductile
Discuss
Answer & Solution
Answer: Option A
Solution:
A face-centered cubic crystal structure will exhibit more ductility (deform more readily under load before breaking) than a body-centered cubic structure.
The bcc lattice, although cubic, is not closely packed and forms strong metals. Alpha-iron and tungsten have the bcc form.
2
Nimonic contains __________ percentage of nickel as that of Inconel.
Discuss
Answer & Solution
Answer: Option A
Solution:
Nimonic is nickel-based high-temperature low creep superalloys. Nimonic alloys typically consist of more than 50% nickel and 20% chromium with additives such as titanium and aluminium.
3
Which one of the following metals would work-harden more quickly than the others?
Discuss
Answer & Solution
Answer: Option B
Solution:
Unlike steel alloys, brass cannot be hardened by heating.
Brass can only be strain or work-hardened.
The hardening occurs when the material is worked mechanically, e.g. by cold working.
The action of force does not harden brass
4
Sulphur in pig iron tends to make it
Discuss
Answer & Solution
Answer: Option A
Solution:
Presence of sulfur tends to make iron hard and produces unsound castings. Wrought iron and steel produced from iron containing sulfur makes wrought iron and steel to be brittle when heated.
5
In low carbon steels, presence of small quantities of sulphur improves
Discuss
Answer & Solution
Answer: Option C
Solution:
Sulfur is normally regarded as an impurity and has an adverse effect on impact properties when a steel is high in sulphur and low in manganese.
Sulphur improves machinability but lowers transverse ductility and notched impact toughness and has little effects on the longitudinal mechanical properties.
6
The ultimate tensile strength of low carbon steel by working at a high strain rate will
Discuss
Answer & Solution
Answer: Option B
Solution:
The ultimate tensile strength of low carbon steel by working at a high strain rate will Increase
7
Normalising of steel is done to
Discuss
Answer & Solution
Answer: Option D
Solution:
Normalising of steel is done to Refine the grain structure and Remove strains caused by cold working and Remove dislocations caused in the internal structure due to hot working
8
Hardness of steel depends on
Discuss
Answer & Solution
Answer: Option A
Solution:
Depending on the temperature and composition of the steel, it can be hardened or softened.
To make steel harder, it must be heated to very high temperatures.
The final result of exactly how hard the steel becomes depends on the amount of carbon present in the metal.
9
The coordination number of a face centered cubic space lattice is
Discuss
Answer & Solution
Answer: Option B
Solution:

The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell.
The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell.
The simple cubic has a coordination number of 6 and contains 1 atom per unit cell
10
The composition of silver solder is
Discuss
Answer & Solution
Answer: Option A
Solution:
silver solder is composition of Silver, copper, zinc