Refractory Technology(Engineering > Chemical Engineering ) Questions and Answers

Question 1. Highest melting (m.p = 3070°C) oxide refractory is
  1.    Alumina
  2.    Thoria
  3.    Zirconia
  4.    Magnesia
Explanation:-
Answer: Option B. -> Thoria
Question 2. Fusion point of an acidic refractory material is
  1.    Increased by the addition of basic oxides
  2.    Reduced by the addition of basic oxides
  3.    Not affected by the addition of basic oxides
  4.    Not affected by the addition of basic oxides
Explanation:-
Answer: Option B. -> Reduced by the addition of basic oxides
Question 3. Which of the following is not a high alumina refractory material?
  1.    Kyanite
  2.    Sillimanite
  3.    Diaspore
  4.    Periclase
Explanation:-
Answer: Option D. -> Periclase
Question 4. Magnesite refractories are generally not used in the
  1.    Electric furnace walls
  2.    Steel melting furnace
  3.    Open hearth furnace
  4.    Burning zone of cement kilns
Explanation:-
Answer: Option B. -> Steel melting furnace
Question 5. 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
Explanation:-
Answer: Option A. -> Beehive coke ovens
Question 6. 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
Explanation:-
Answer: Option D. -> 65
Question 7. Magnesite chrome bricks are used in the
  1.    Roof lining of basic open hearth & other basic furnaces
  2.    Reheating furnaces
  3.    Soaking pits
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 8. Which of the following bricks has the most close values of RUL and PCE?
  1.    Silica bricks
  2.    Fireclay bricks
  3.    High alumina bricks
  4.    Tar dolomite bricks
Explanation:-
Answer: Option A. -> Silica bricks
Question 9. __________ is the measure of the strength of refractory under the combined effect of temperature & load.
  1.    Porosity
  2.    RUL
  3.    Specific gravity
  4.    Thermal conductivity
Explanation:-
Answer: Option B. -> RUL
Question 10. An indication of degree of firing in silica brick is its
  1.    Specific gravity
  2.    Fusion point
  3.    RUL
  4.    None of these
Explanation:-
Answer: Option A. -> Specific gravity
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