171. Softness of silver can be converted into hardness by alloying it with small quantity of
Copper & nickel
Zinc
Aluminium
Tin
✅ The correct answer is option A.
Materials and Construction MCQs
172. Urea autoclave is made of
Cast iron
Refractory blocks
Stainless steel
Lead lined steel
✅ The correct answer is option C.
173. German silver in an alloy of
Copper, nickel and zinc
Copper, aluminium and silver
Silver, zinc and aluminium
Silver, nickel and zinc
✅ The correct answer is option A.
174. Hardened steel is softened by
Normalising
Tempering
Annealing
Carburising
✅ The correct answer is option B.
175. The digester of a Gobar gas plant is a
Mild steel drum
Stainless steel vessel
Masonry well
Cast iron vessel
✅ The correct answer is option C.
176. Which of the following alloys does not contain nickel?
Chlorinet – 2 alloy
Monel
Inconel
Babbit metal
✅ The correct answer is option D.
177. Cast iron and steel pipes are produced by __________ casting.
Die
Investment
Slush
True centrifugal
✅ The correct answer is option D.
178. Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
1.5-2
3.5-4.5
7-Sep
Dec-14
✅ The correct answer is option D.
179. A material is called ‘ductile’, if it can be
Drawn into wires
Hammered to a thin sheet
Fractured without deformation
Made lustrous by heating it
✅ The correct answer is option A.
180. Stainless steel contains
Chromium and nickel
Copper
Aluminium
Vanadium
✅ The correct answer is option A.