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MCQs

Total Questions : 515 | Page 3 of 52 pages
Question 21. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
  1.    Soaking pits
  2.    Ceheating furnace
  3.    L.D. converter
  4.    Rotary lime kiln
 Discuss Question
Answer: Option C. -> L.D. converter
Answer: (c).L.D. converter
Question 22. Silicon carbide refractories have very low
  1.    refractoriness (< 1700°C).
  2.    thermal conductivity.
  3.    resistance to thermal shock.
  4.    none of these.
 Discuss Question
Answer: Option D. -> none of these.
Answer: (d).none of these.
Question 23. __________ nozzles are used in continuous casting of steel.
  1.    Zircon
  2.    Thoria
  3.    Carborundum
  4.    Beryllia
 Discuss Question
Answer: Option A. -> Zircon
Answer: (a).Zircon
Question 24. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm².
  1.    10
  2.    100
  3.    500
  4.    1000
 Discuss Question
Answer: Option D. -> 1000
Answer: (d).1000
Question 25. Basic bricks are not made of
  1.    fireclay
  2.    magnesite
  3.    foresterite
  4.    chromite
 Discuss Question
Answer: Option A. -> fireclay
Answer: (a).fireclay
Question 26. With increase in the alumina content in firebricks, its fusion point (refractoriness)
  1.    decreases linearly
  2.    remains unchanged
  3.    increases
  4.    decreases
 Discuss Question
Answer: Option C. -> increases
Answer: (c).increases
Question 27. 'Super refractories' are made from pure
  1.    carbides
  2.    oxides
  3.    borides
  4.    nitrides
 Discuss Question
Answer: Option B. -> oxides
Answer: (b).oxides
Question 28. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.
  1.    fireclay
  2.    silica
  3.    magnesite
  4.    corundum
 Discuss Question
Answer: Option A. -> fireclay
Answer: (a).fireclay
Question 29. 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.    always more than 2500°C.
 Discuss Question
Answer: Option B. -> reduced by the addition of basic oxides.
Answer: (b).reduced by the addition of basic oxides.
Question 30. Which is required in an insulating refractory ?
  1.    High thermal conductivity
  2.    Low porosity
  3.    Both (a) and (b)
  4.    Neither (a) nor (b)
 Discuss Question
Answer: Option D. -> Neither (a) nor (b)
Answer: (d).Neither (a) nor (b)

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