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MCQs

Total Questions : 868 | Page 85 of 87 pages
Question 841. Fusion temperature of pure silica (SiO2) is _______________ °C?
  1.    1350
  2.    1715
  3.    2570
  4.    2800
 Discuss Question
Answer: Option B. -> 1715
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 842. Porosity of fireclay refractories is _______________ percent?
  1.    5-10
  2.    10-25
  3.    25-35
  4.    35-50
 Discuss Question
Answer: Option B. -> 10-25
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 843. Refractory bricks with lower permeability is produced by using __________________?
  1.    Higher firing temperature
  2.    Higher moulding pressure
  3.    Finer grog size
  4.    All A., B. and C.
 Discuss Question
Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 844. Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?
  1.    Beryllia
  2.    Carborundum
  3.    Corundum
  4.    Thoria
 Discuss Question
Answer: Option A. -> Beryllia
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 845. Bottom of basic open hearth furnace are constructed of__________________?
  1.    Dead burnt magnesite ramming mass
  2.    Porous fireclay bricks
  3.    Semi-silica bricks
  4.    Silicon carbide bricks
 Discuss Question
Answer: Option A. -> Dead burnt magnesite ramming mass
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 846. Addition of zircon to silica refractory brick improves its_____________________?
  1.    Crushing strength
  2.    Resistance to slag attack
  3.    Both A. and B.
  4.    Neither A. nor B.
 Discuss Question
Answer: Option B. -> Resistance to slag attack
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 847. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 848. Silica bricks are never used for lining the____________________?
  1.    Beehive coke ovens
  2.    By-product coke ovens
  3.    Dome of blast furnace stoves
  4.    Roof of open hearth furnace
 Discuss Question
Answer: Option A. -> Beehive coke ovens
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 849. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?
  1.    Fireclay
  2.    Silicon carbide
  3.    Corundum
  4.    Siliceous fireclay
 Discuss Question
Answer: Option B. -> Silicon carbide
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 850. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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