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MCQs

Total Questions : 868 | Page 82 of 87 pages
Question 811. Vacuum steel degassing units are lined with__________________?
  1.    Silica bricks
  2.    Low duty firebricks
  3.    High alumina bricks
  4.    Graphite blocks
 Discuss Question
Answer: Option C. -> High alumina bricks
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 812. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?
  1.    450
  2.    250
  3.    150
  4.    65
 Discuss Question
Answer: Option D. -> 65
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 813. With increasing alumina content, the fusion point of high alumina refractories__________________?
  1.    Increases
  2.    Decreases
  3.    Remain constant
  4.    May increase or decrease; depends on its alumina content
 Discuss Question
Answer: Option A. -> Increases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 814. Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
  1.    High duty fireclay
  2.    Silica
  3.    Mullite
  4.    Carborundum
 Discuss Question
Answer: Option A. -> High duty fireclay
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 815. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 816. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?
  1.    Segar cones
  2.    Muffles for muffle furnaces
  3.    Insulating bricks
  4.    Crucibles used for melting of high purity metals
 Discuss Question
Answer: Option D. -> Crucibles used for melting of high purity metals
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 817. Zirconia refractories are not used in_____________________?
  1.    Making sheaths for thermocouple
  2.    Lining high temperature ceramic kilns
  3.    Furnaces subjected to fluctuating temperature
  4.    High frequency induction furnaces in the form of inductors
 Discuss Question
Answer: Option C. -> Furnaces subjected to fluctuating temperature
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 818. PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?
  1.    1520
  2.    1630
  3.    1670
  4.    1730
 Discuss Question
Answer: Option D. -> 1730
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 819. Spray test determines the _____________ of refractories?
  1.    Resistance to slag penetration
  2.    Resistance to CO attack
  3.    RUL
  4.    Permanent linear change
 Discuss Question
Answer: Option A. -> Resistance to slag penetration
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 820. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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