141. The machine tool guide ways are usually hardened by
vacuum hardening
martempering
induction hardening
flame hardening
✅ The correct answer is option D.
Engineering Materials MCQs
142. Normalising of steel is done to
refine the grain structure
remove strains caused by cold working
remove dislocations caused in the internal structuure due to hot working
all of the above
✅ The correct answer is option D.
143. Which of the following gives the correct order of increasing hot hardness of cutting tool materials?
Diamond, Carbide, High speed steel
Carbide, Diamond, High speed steel
High speed steel, Carbide, Diamond
High speed steel, Diam
✅ The correct answer is option C.
144. In low carbon steels, presence of small quantities of sulphur improves
weldability
formability
machinability
hardenability
✅ The correct answer is option C.
145. Which of the following statements are true for annealing of steels?
Steels are heated to 500 to 700° C
Cooling is done slowly and steadily
Internal stresses are relieved
all of these
✅ The correct answer is option D.
146. Hindalium is an alloy of aluminium and magnesium with a small quantity of chromium.
Agree
Disagree
✅ The correct answer is option A.
147. In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre.
Yes
No
✅ The correct answer is option A.
148. The process which improves the machinability of steels, but lowers the hardness and tensile strength, is
normalising
full annealing
process annealing
spheroidising
✅ The correct answer is option D.
149. In induction hardening __________ is high.
current
voltage
frequency
temperature
✅ The correct answer is option C.
150. The ductility is the property of a material due to which it
can be drawn into wires
breaks with little permanent distortion
can be rolled or hammered into thin sheets
can resist fracture du
✅ The correct answer is option A.