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MCQs

Total Questions : 515 | Page 4 of 52 pages
Question 31. Refractoriness under load (RUL) is the most important property for the refractory bricks
  1.    at the hearth bottom of the furnace on which stock is placed.
  2.    used for furnace insulation.
  3.    used in the roof of the furnace.
  4.    none of these.
 Discuss Question
Answer: Option A. -> at the hearth bottom of the furnace on which stock is placed.
Answer: (a).at the hearth bottom of the furnace on which stock is placed.
Question 32. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
  1.    aluminium phosphate
  2.    water
  3.    lime
  4.    plaster of paris
 Discuss Question
Answer: Option B. -> water
Answer: (b).water
Question 33. High thermal conductivity of a refractory material is not important, when it is to be used in the
  1.    coke oven regenarators
  2.    muffle furnace
  3.    blast furnace
  4.    recuperators
 Discuss Question
Answer: Option C. -> blast furnace
Answer: (c).blast furnace
Question 34. Si percentage in silica refractories used in the walls of coke oven is about
  1.    45
  2.    60
  3.    80
  4.    95
 Discuss Question
Answer: Option D. -> 95
Answer: (d).95
Question 35. Maximum safe working temperature for fireclay bricks is about __________ °C.
  1.    1150
  2.    1300
  3.    1450
  4.    1550
 Discuss Question
Answer: Option D. -> 1550
Answer: (d).1550
Question 36. Alumina-graphite bricks are used for lining the
  1.    slide gate in teeming laddies.
  2.    continuous casting systems.
  3.    both (a) and (b).
  4.    neither (a) nor (b).
 Discuss Question
Answer: Option C. -> both (a) and (b).
Answer: (c).both (a) and (b).
Question 37. Ferromagnetic ceramic material is not used in the
  1.    thermal insulation
  2.    transformers
  3.    magnetic switches
  4.    television sets
 Discuss Question
Answer: Option A. -> thermal insulation
Answer: (a).thermal insulation
Question 38. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
  1.    Tar bonded dolomite bricks
  2.    Fireclay bricks
  3.    Mullite bricks
  4.    Magnesite bricks
 Discuss Question
Answer: Option A. -> Tar bonded dolomite bricks
Answer: (a).Tar bonded dolomite bricks
Question 39. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
  1.    fireclay
  2.    carborundum
  3.    graphite
  4.    chromite
 Discuss Question
Answer: Option C. -> graphite
Answer: (c).graphite
Question 40. Spalling resistance of a refractory can not be increased by
  1.    increasing its porosity.
  2.    using a coarser grog during its manufacture.
  3.    decreasing its thermal co-efficient of expansion.
  4.    making it denser.
 Discuss Question
Answer: Option D. -> making it denser.
Answer: (d).making it denser.

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