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MCQs

Total Questions : 515 | Page 9 of 52 pages
Question 81. Silica refractories are not used in
  1.    coke oven walls.
  2.    beehive coke ovens.
  3.    dome and upper portion of B.F. stoves.
  4.    open hearth furnace roof.
 Discuss Question
Answer: Option B. -> beehive coke ovens.
Answer: (b).beehive coke ovens.
Question 82. Refractory materials are never used in the construction of
  1.    segar cones
  2.    orton cones
  3.    pressure vessels
  4.    ovens & retorts
 Discuss Question
Answer: Option C. -> pressure vessels
Answer: (c).pressure vessels
Question 83. Fireclay bricks are used in the
  1.    furnaces allowed to cool frequently
  2.    flues
  3.    chimney linings
  4.    all (a), (b) and (c)
 Discuss Question
Answer: Option D. -> all (a), (b) and (c)
Answer: (d).all (a), (b) and (c)
Question 84. Carbon refractories have very high
  1.    wetting characteristics
  2.    refractoriness
  3.    thermal conductivity
  4.    both (b) and (c)
 Discuss Question
Answer: Option D. -> both (b) and (c)
Answer: (d).both (b) and (c)
Question 85. Segar cones are used for the determination of __________ of refractories.
  1.    softening temperature
  2.    spalling resistance
  3.    electrical conductivity
  4.    resistance to slag attack
 Discuss Question
Answer: Option A. -> softening temperature
Answer: (a).softening temperature
Question 86. Orlan fibre which is used as a wool sub stitute is
  1.    an amorphous polymer.
  2.    a natural polymeric fibre.
  3.    polyacrylonitrile.
  4.    polymethylmethacrylate (PMMA).
 Discuss Question
Answer: Option C. -> polyacrylonitrile.
Answer: (c).polyacrylonitrile.
Question 87. Trade name of __________ is neoprene.
  1.    polychloroprene
  2.    polyisoprene
  3.    polytetraflouroethylene
  4.    poly vinyl acetate
 Discuss Question
Answer: Option A. -> polychloroprene
Answer: (a).polychloroprene
Question 88. Dacron is a/an
  1.    polyester
  2.    unsaturated polyester
  3.    polyamide
  4.    inorganic polymer
 Discuss Question
Answer: Option A. -> polyester
Answer: (a).polyester
Question 89. SBR is produced by the copolymerisation of butadiene & styrene by employing emulsion polymerisation. The weight ratio of styrene and butadiene is maintained at
  1.    1:3
  2.    3:1
  3.    1:2
  4.    2:1
 Discuss Question
Answer: Option A. -> 1:3
Answer: (a).1:3
Question 90. Neoprene is the trade name of
  1.    polyurethane
  2.    phenol formaldehyde
  3.    polychlorophrene
  4.    styrene butadiene rubber (SBR)
 Discuss Question
Answer: Option C. -> polychlorophrene
Answer: (c).polychlorophrene

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