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MCQs

Total Questions : 868 | Page 86 of 87 pages
Question 851. 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
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 852. 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 A., B. and C.
 Discuss Question
Answer: Option D. -> All A., B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 853. Which is not an acidic refractory ?
  1.    Silica
  2.    Fireclay
  3.    High alumina refractory
  4.    Carbon black
 Discuss Question
Answer: Option D. -> Carbon black
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 854. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at ______________ °C for 24 hours?
  1.    700
  2.    1000
  3.    1600
  4.    2000
 Discuss Question
Answer: Option C. -> 1600
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 855. Which is an acidic refractory ?
  1.    Magnesite
  2.    Dolomite
  3.    Fireclay
  4.    Chrome magnesite
 Discuss Question
Answer: Option C. -> Fireclay
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 856. Fireclay bricks are used in the__________________?
  1.    Coke ovens regenerator
  2.    Outer lining of L.D. converter
  3.    Hearth bottom of blast furnace
  4.    Coke oven walls
 Discuss Question
Answer: Option B. -> Outer lining of L.D. converter
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 857. Fireclay bricks are not used in the_____________________?
  1.    Blast furnace
  2.    Hot blast stove
  3.    Cupola
  4.    Wall of coke oven
 Discuss Question
Answer: Option D. -> Wall of coke oven
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 858. Fusion point of a basic refractory material is__________________?
  1.    Reduced by the addition of acid oxides
  2.    Increased by the addition of acid oxides
  3.    Not affected by the addition of acid oxides
  4.    Always less than 1000°C
 Discuss Question
Answer: Option A. -> Reduced by the addition of acid oxides
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 859. Which form of silica has the highest specific gravity ?
  1.    Quartz
  2.    Cristobalite
  3.    Tridymite
  4.    All have the same specific gravity
 Discuss Question
Answer: Option A. -> Quartz
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 860. Thermal conductivity of refractory bricks_________________?
  1.    Increases with decrease in porosity
  2.    Decreases with decreases in porosity
  3.    Is independent of its porosity and is maximum for insulating bricks
  4.    Increases with the amount of air entrapped in pores
 Discuss Question
Answer: Option A. -> Increases with decrease in porosity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

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