191. Which of the following has the highest density and the lowest melting point?
Stainless steel
Titanium
Lead
Aluminium
✅ The correct answer is option C.
Materials and Construction MCQs
192. When iron is rusted, it is
Converted to a fine powder
Reduced
Oxidised
None of these
✅ The correct answer is option C.
193. Vessels made of __________ can be used to store dry chlorine.
Thermoplastic materials
Nickel
Steel or iron
None of these
✅ The correct answer is option C.
194. Shock resisting steels should possess high
Hardness
Toughness
Tensile strength
Wear resistance
✅ The correct answer is option B.
195. Tin coating is not done by
Vaporising
Hot dipping
Electro deposition
Spraying
✅ The correct answer is option A.
196. Duriron is
Acid resistant, brittle and very hard
High silicon iron
Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion
All of the above
✅ The correct answer is option D.
197. Wrought iron is having very high
Hardness
Strength
Corrosion resistance
Susceptibility to changes in its properties by heat treatment
✅ The correct answer is option C.
198. An ideal material of construction for the storage of 50% caustic soda solution would be
Karbate
High silicon cast iron
Monel
None of these
✅ The correct answer is option C.
199. Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?
Armature of small motors/generators
Generators and small motors
Induction motors
High frequency transformers
✅ The correct answer is option D.
200. Which of the following is not shipped in mild steel containers?
Acetone
Ammonia
Ethyl alcohol
Formic acid
✅ The correct answer is option D.