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MCQs

Total Questions : 868 | Page 12 of 87 pages
Question 111. The largest consumer of refractories is the __________ industry.
  1.    Cement
  2.    Metallurgical
  3.    Fertiliser
  4.    Power
 Discuss Question
Answer: Option B. -> Metallurgical
Question 112. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C.
  1.    500
  2.    1000
  3.    >1350
  4.    >2000
 Discuss Question
Answer: Option C. -> >1350
Question 113. Fireclay refractories
  1.    Are not resistant to the action of basic slags
  2.    Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc
  3.    Shrink during firing
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 114. Which is the most stable crystalline form of silica at room temperature?
  1.    Quartz
  2.    Cristobalite
  3.    Tridymite
  4.    None of these
 Discuss Question
Answer: Option A. -> Quartz
Question 115. Fireclay refractories have
  1.    Low co-efficient of thermal expansion
  2.    Poor thermal spalling resistance
  3.    Tendency to expand unduly high during firing
  4.    Very high cost
 Discuss Question
Answer: Option A. -> Low co-efficient of thermal expansion
Question 116. 'Super refractories' are made from pure
  1.    Carbides
  2.    Oxides
  3.    Borides
  4.    Nitrides
 Discuss Question
Answer: Option B. -> Oxides
Question 117. Pyrometric cone equivalent (PCE) of a refractory is the measure of its
  1.    Spalling resistance
  2.    Fusion point
  3.    Resistance to slag penetration
  4.    Resistance to carbon monoxide attack
 Discuss Question
Answer: Option B. -> Fusion point
Question 118. Grog addition in fireclay during brick manufacture is done to
  1.    Reduce its shrinkage on heating
  2.    Impart greater spalling resistance
  3.    Enhance the strength of fired refractories
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 119. The maximum linear expansion of silica bricks during firing is about __________ percent.
  1.    0.5
  2.    1
  3.    2
  4.    3.5
 Discuss Question
Answer: Option D. -> 3.5
Question 120. The highest melting pure oxide (m.p. > 3000°C) is
  1.    Thoria
  2.    Alumina
  3.    Beryllia
  4.    Zirconia
 Discuss Question
Answer: Option A. -> Thoria

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