Lakshya Education MCQs

Question: Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
A.Soaking pits
B.Ceheating furnace
C.L.D. converter
D.Rotary lime kiln
Answer: Option C

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Question 1. Which furnace consumes maximum refractory annually in an integrated steel plant?
  1.    Soaking pit
  2.    Blastfurnace
  3.    L.D. converter
  4.    Coke ovens
Answer: Option C
Question 2. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
  1.    1800
  2.    2200
  3.    2400
  4.    2700
Answer: Option D
Question 3. Fireclay bricks are used in the
  1.    Furnaces allowed to cool frequently
  2.    Flues
  3.    Chimney linings
  4.    All of the above
Answer: Option D
Question 4. The main raw material for manufacture of silicon carbide refractories is
  1.    Corrundum
  2.    Carborundum
  3.    Bauxite
  4.    Periclase
Answer: Option B
Question 5. Spray test determines the __________ of refractories.
  1.    Resistance to slag penetration
  2.    Resistance to CO attack
  3.    RUL
  4.    Permanent linear change
Answer: Option A
Question 6. Fusion temperature of pure silica (SiO₂) is __________ °C.
  1.    1350
  2.    1715
  3.    2570
  4.    2800
Answer: Option B

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