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MCQs

Total Questions : 868 | Page 15 of 87 pages
Question 141. Which furnace consumes maximum refractory annually in an integrated steel plant?
  1.    Soaking pit
  2.    Blastfurnace
  3.    L.D. converter
  4.    Coke ovens
 Discuss Question
Answer: Option C. -> L.D. converter
Question 142. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
  1.    1800
  2.    2200
  3.    2400
  4.    2700
 Discuss Question
Answer: Option D. -> 2700
Question 143. Fireclay bricks are used in the
  1.    Furnaces allowed to cool frequently
  2.    Flues
  3.    Chimney linings
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 144. 'Spinel', a refractory mineral is chemically represented as
  1.    MgAl2O₄
  2.    MgAl2O₃
  3.    MgSO₄
  4.    MgAl2O₃.2H₂O
 Discuss Question
Answer: Option A. -> MgAl2O₄
Question 145. Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its
  1.    Non-wetting characteristic
  2.    High thermal conductivity
  3.    High crushing strength
  4.    None of these
 Discuss Question
Answer: Option A. -> Non-wetting characteristic
Question 146. Pick out the wrong statement.
  1.    Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks
  2.    Graphite refractories are also called plumbago refractories
  3.    Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
  4.    Calcined magnesite is also called dead burnt magnesite
 Discuss Question
Answer: Option C. -> Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
Question 147. Fireclay bricks are not used in the
  1.    Beehive coke oven
  2.    By-product coke oven walls
  3.    Combustion chamber of B.F. stoves
  4.    Coke oven regenerators
 Discuss Question
Answer: Option B. -> By-product coke oven walls
Question 148. Magnesite chrome refractories
  1.    Have better spalling resistance than chrome magnesite refractories
  2.    Have very low thermal co-efficient of expansion
  3.    Are not at all resistant to the corrosive action of iron oxide
  4.    Have very low (50 kg/cm² ) cold crushing strength (C.C.S.), and can not be used in metalcase form
 Discuss Question
Answer: Option A. -> Have better spalling resistance than chrome magnesite refractories
Question 149. Spalling of a refractory means its
  1.    Softening
  2.    Fracture due to uneven expansion at high temperature
  3.    Resistancce to compressive loads
  4.    Resistance to chemical action of gases and molten fluxes
 Discuss Question
Answer: Option B. -> Fracture due to uneven expansion at high temperature
Question 150. Refractory bricks with lower permeability is produced by using
  1.    Higher firing temperature
  2.    Higher moulding pressure
  3.    Finer grog size
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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