2135. __________ iron is produced, when molten pig iron is chilled suddenly.
White cast
Grey cast
Wrought
None of these
✅ The correct answer is option A.
2138. Which of the following undergoes granular fracture?
Wrought iron
Steel
Cast iron
None of these
✅ The correct answer is option B.
2141. __________ is not a case hardening process.
Carburising
Nitriding
Cyaniding
Annealing
✅ The correct answer is option D.
2144. Hydrochloric acid is stored in a __________ steel vessel.
Lead lined
Rubber lined
Glass lined
Stainless
✅ The correct answer is option B.
2106. High speed steel tools retain their hardness upto a temperature of __________ °C.
500
750
900
1100
✅ The correct answer is option C.
2108. Concentrated HCl at 30°C can be stored in a vessel made of
PTFE and porcelain
Cast iron and aluminium
Stainless steel and high silicon cast iron
None of these
✅ The correct answer is option A.
2110. The material of construction of pressure mills used for squeezing out the juice from sugar cane is
Stainless steel
Cast iron
Mild steel
Monel
✅ The correct answer is option B.
2112. Copper is dissolved from its ore by H₂SO₄ in a percolation tank made of
Wood
Stainless steel
Reinforced concrete lined with lead
High silicon iron (14% Si)
✅ The correct answer is option C.
2114. Approximate value of the modulus of elasticity for steel is about __________ x l0⁶kg/cm².
0.5
2
40
75
✅ The correct answer is option B.
2116. Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
Oxygen
Arsenic
Antimony
Bismuth
✅ The correct answer is option D.