2141. __________ is not a case hardening process.
Carburising
Nitriding
Cyaniding
Annealing
✅ The correct answer is option D.
Chemical Engineering
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2142. Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by
Dilute HCI
Acetic acid
Concentrated H₂SO₄
None of these
✅ The correct answer is option B.
2143. To improve the machinability of steel, it is generally subjected to
Spheroidising
Tempering
Normalising
Annealing
✅ The correct answer is option A.
2144. Hydrochloric acid is stored in a __________ steel vessel.
Lead lined
Rubber lined
Glass lined
Stainless
✅ The correct answer is option B.
2145. The softest material just next to talc in the Mho’s scale is
Quartz
Gypsum
Feldspar
Fluorite
✅ The correct answer is option B.
2146. Nickel as a material of construction
Is used as an alloying element for both ferrous & non-ferrous alloys
Is paramagnetic below 415° C (its Curie temperature)
Dimagnetic
Has a body centred cubic (bcc) crystal lattice structure
✅ The correct answer is option A.
2147. Which of the following is the most widely used insulating material for steam carray-ing pipelines?
Ceramic fibre blanket
Glass wool and 85% magnesia
Vermiculite
Slag wool
✅ The correct answer is option B.
2148. Glass lined vessels are not used for handling/storing
Dilute H₂SO₄
Dilute HNO₃
Dilute HCl
Hydroflouric acid
✅ The correct answer is option D.
2149. Which of the following metals in not used for coating of the base metal to guard it against corrosion?
Lead
Cadmium
Magnesium
Aluminium
✅ The correct answer is option C.
2150. The main purpose of galvanising iron sheets is to
Harden the surface
Increase its glossiness and lustre
Prevent the action of water
Prevent the action of oxygen
✅ The correct answer is option C.