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MCQs

Total Questions : 868 | Page 11 of 87 pages
Question 101. Dolomite bricks have good resistance to attack by
  1.    Molten steel
  2.    Iron oxide
  3.    Lime slag
  4.    None of these
 Discuss Question
Answer: Option A. -> Molten steel
Question 102. Mullite is chemically represented by
  1.    Al2O₃ . 2SiO₂
  2.    3Al2O₃ . 2SiO₂
  3.    Al2O₃ . SiO₂
  4.    2Al2O₃ . 3SiO₂
 Discuss Question
Answer: Option B. -> 3Al2O₃ . 2SiO₂
Question 103. Chrome magnesite is not used in the
  1.    Inner lining of L.D. converter
  2.    Aluminium melting furnaces
  3.    Wear out lining of steel melting furnaces
  4.    All of the above
 Discuss Question
Answer: Option C. -> Wear out lining of steel melting furnaces
Question 104. Magnesite bricks are used in those parts of furnaces, which are
  1.    Subjected to temperature fluctuation
  2.    Required to resist corrosive basic slag
  3.    Subjected to high load
  4.    None of these
 Discuss Question
Answer: Option B. -> Required to resist corrosive basic slag
Question 105. Silicon carbide refractories are used in the
  1.    Muffle furnace
  2.    Zinc smelting furnace
  3.    Ceramic recuperators
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 106. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
  1.    Thermal spalling
  2.    Slag attack
  3.    Fusion under load
  4.    CO attack
 Discuss Question
Answer: Option A. -> Thermal spalling
Question 107. To resist spalling tendency, a refractory should have
  1.    Greater diffusivity
  2.    Low specific heat
  3.    Low thermal co-efficient of expansion
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 108. 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
Question 109. Carbon refractories are exclusively used in the
  1.    Hearth of blast furnace
  2.    Walls of coke oven
  3.    Regenerators of coke oven
  4.    Side wall of soaking pits
 Discuss Question
Answer: Option A. -> Hearth of blast furnace
Question 110. Refractoriness under load (RUL) is the most important property for the refractory bricks
  1.    At the hearth bottom of the furnace on which stock is placed
  2.    Used for furnace insulation
  3.    Used in the roof of the furnace
  4.    None of these
 Discuss Question
Answer: Option A. -> At the hearth bottom of the furnace on which stock is placed

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