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MCQs

Total Questions : 868 | Page 9 of 87 pages
Question 81. Conversion of silica mineral to cristobalite is accompanied by reduction in its
  1.    Volume
  2.    Specific gravity
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option B. -> Specific gravity
Question 82. Cermets are
  1.    Composite material containing both ceramic & metallic constituents
  2.    Having high strength & resistance to high temperature
  3.    Used in space vehicles, missiles & nuclear energy plants
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 83. Which is not a basic refractory?
  1.    Chrome magnesite
  2.    Magnesite
  3.    Dolomite
  4.    Silicon carbide
 Discuss Question
Answer: Option D. -> Silicon carbide
Question 84. Chromite refractories are
  1.    Acidic refractory
  2.    Neutral refractory
  3.    Basic refractory
  4.    Fired at a temperature of 600°C only
 Discuss Question
Answer: Option B. -> Neutral refractory
Question 85. Chrome magnesite bricks are
  1.    Acidic in nature
  2.    Neutral in nature
  3.    Having higher RUL than silica bricks
  4.    Made by mixing 30% chromite and 70% periclase
 Discuss Question
Answer: Option C. -> Having higher RUL than silica bricks
Question 86. Refractory bricks having lower porosity have
  1.    High insulating properties
  2.    Low heat capacity
  3.    Low thermal conductivity
  4.    Greater strength
 Discuss Question
Answer: Option D. -> Greater strength
Question 87. Semi-silica bricks compared to silica bricks have
  1.    Less fusion point
  2.    Better spalling resistance
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 88. Colour of fireclay bricks is
  1.    Light buff to reddish buff
  2.    Yellow
  3.    Black
  4.    None of these
 Discuss Question
Answer: Option A. -> Light buff to reddish buff
Question 89. Fireclay bricks is not used for lining the
  1.    Cupola
  2.    Gas producer
  3.    Bottom of hot metal mixer
  4.    Roof of open hearth furnace
 Discuss Question
Answer: Option C. -> Bottom of hot metal mixer
Question 90. Magnesite refractories have low resistance to
  1.    Attack by basic slag
  2.    Abrasion
  3.    Disintegration on sudden change of temperature
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C

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