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MCQs

Total Questions : 1977 | Page 2 of 198 pages
Question 11. The fermentor used for the production of ethyl alcohol from molasses is made of
  1.    Wood
  2.    Concrete
  3.    Copper bearing steel
  4.    Procelain
 Discuss Question
Answer: Option C. -> Copper bearing steel
Question 12. The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
  1.    Tempering
  2.    Normalising
  3.    Annealing
  4.    None of these
 Discuss Question
Answer: Option B. -> Normalising
Question 13. The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.
  1.    Non-crystalline solid
  2.    Crystalline
  3.    Rubberry
  4.    Non-crystalline organic polymeric
 Discuss Question
Answer: Option D. -> Non-crystalline organic polymeric
Question 14. Cast iron compared to steel is better in
  1.    Ductility
  2.    Fluidity & castability
  3.    Strength
  4.    Malleability
 Discuss Question
Answer: Option B. -> Fluidity & castability
Question 15. H₂SO₄ (< 50% concentration) is corrosive to
  1.    Aluminium, mild steel, stainless steel, concrete & tin
  2.    Copper, cast iron & high silicon iron (14% Si)
  3.    Rubber (butyl and hard), silicone rubber & teflon
  4.    Glass, graphite, porcelain & stoneware
 Discuss Question
Answer: Option A. -> Aluminium, mild steel, stainless steel, concrete & tin
Question 16. Constantan is an alloy of
  1.    Cu (55%) & Sn (45%)
  2.    Cu (55%) & Ni (45%)
  3.    Pt (95%) & Rh (10%)
  4.    Fe (80%) & Ni (20%)
 Discuss Question
Answer: Option B. -> Cu (55%) & Ni (45%)
Question 17. Constituents of stellite are
  1.    Zinc, copper and nickel
  2.    Cobalt, chromium and tungsten
  3.    Zinc, aluminium and nickel
  4.    Nickel, cobalt and vanadium
 Discuss Question
Answer: Option B. -> Cobalt, chromium and tungsten
Question 18. Polythene (low or high density) containers are not corroded by
  1.    Sulphuric acid (10%) at room temperature
  2.    Nitric acid (95%) at room temperature
  3.    Sulphur trioxide at 60°C
  4.    Any of these
 Discuss Question
Answer: Option A. -> Sulphuric acid (10%) at room temperature
Question 19. An alloy of iron containing 4% carbon is called
  1.    High carbon steel
  2.    Wrought iron
  3.    Mild steel
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 20. German silver used for decorative purposes contains maximum percentage of
  1.    Silver
  2.    Copper
  3.    Zinc
  4.    Nickel
 Discuss Question
Answer: Option B. -> Copper

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