231. Which of the following property is desirable for materials used in tools and machines?
Elasticity
Plasticity
Ductility
Malleability
✅ The correct answer is option A.
Engineering Materials MCQs
232. In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.
TRUE
FALSE
✅ The correct answer is option A.
233. The delta-iron possesses a body centred cubic space lattice.
Correct
Incorrect
✅ The correct answer is option A.
234. Chilled cast iron is produced
by adding magnesium to molten cast iron
by quick cooling of molten cast iron
from white cast iron by annealing process
none of these
✅ The correct answer is option B.
235. When a medium carbon steel is heated to coarsening temperature,
there is no change in grain size
the average grain size is a minimum
the grain size increases very rapidly
the grain size first i
✅ The correct answer is option C.
236. Shock resistance of steel is increased by adding
nickel
chromium
nickel and chromium
sulphur, lead and phos
✅ The correct answer is option C.
237. The phosphorus and sulphur in steel making can be removed by using basic bessemer process.
Correct
Incorrect
✅ The correct answer is option A.
238. Incoloy, Hastelloy and Vitallium are __________ temperature alloys.
high
low
✅ The correct answer is option A.
239. The stiffness is the ability of a material to resist deformation under stress.
TRUE
FALSE
✅ The correct answer is option A.
240. Which of the following material has maximum malleability?
Lead
Soft steel
Wrought iron
Copper
✅ The correct answer is option A.