41. Steel pipes are normally manufactured by __________ process.
Extrusion
Cold working
Forging
Electroforming
✅ The correct answer is option A.
Materials and Construction MCQs
42. Presence of manganese in alloy steel improves its
Corrosion resistance
Cutting ability
Abrasion resistance & toughness
Elasticity & creep resistance
✅ The correct answer is option C.
43. ‘Hypersil’ is a __________ steel.
High speed
Silicon
Molybdenum
Tungsten
✅ The correct answer is option B.
44. Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower
Price
Corrosion resistance
Thermal conductivity
Abundant availability
✅ The correct answer is option D.
45. Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium
Tin, nickel, iron and chromium
And graphite
And copper
None of these
✅ The correct answer is option A.
46. Clock pendulums are usually made of __________ steel.
High speed
Stainless
Heat resisting
None of these
✅ The correct answer is option D.
47. Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
Rubber lined mild steel
Lead lined mild steel
Aluminium
Cast iron
✅ The correct answer is option A.
48. In the kraft (sulphate) process for the paper manufacture, the digestor is made of
Cast iron
Stainless steel
Karbate carbon
Wrought iron
✅ The correct answer is option B.
49. The presence of impurities in iron
Increases its melting point
Does not affect its melting point
Decreases its melting point
Makes it malleable
✅ The correct answer is option C.
50. Carbon is present in the uncombined (graphitic) form in case of
Cast iron
Steel
Ferroalloy
None of these
✅ The correct answer is option A.