211. Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.
High silicon iron, Kel-F and teflon
Tin and wood
Silicone rubber
Stainless steel
✅ The correct answer is option A.
Materials and Construction MCQs
212. Thermosetting resins are those polymers, which
Do not increase in plasticity with rise in temperature
Allow slip to occur between molecules
Do not take on a permanent set
None of these
✅ The correct answer is option A.
213. Presence of cobalt in steel improves its
Cutting ability
Corrosion resistance
Tensile strength
None of these
✅ The correct answer is option A.
214. Fatigue failure of a material may occur, when it is subjected to __________ stress.
Fluctuating
Tensile
Compressive
Torsion
✅ The correct answer is option A.
215. Residual magnetism in steel for magnets is increased by the addition of
Nickel
Cobalt
Tungsten
Chromium
✅ The correct answer is option B.
216. Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?
Cast iron
Steel
Nickel
Karbate
✅ The correct answer is option C.
217. Which of the following has the least value of ultimate tensile strength (UTS)?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron
✅ The correct answer is option C.
218. The fermentor used in the production of pencillin (by deep fermentation process) is made of
Glass
Glass lined steel
High silicon cast iron
Procelain
✅ The correct answer is option B.
219. Which is the purest form of iron?
Wrought iron
Pig iron
Bessemer iron
Grey iron
✅ The correct answer is option A.
220. Nickel base alloys with __________ are known as monel metal.
Zinc
Tin
Copper
Molybdenum
✅ The correct answer is option C.