Furnace And Refractories Technology MCQ

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• With increase in the porosity, thermal spalling resistance of fireclay brick
  ক

  increases

  খ

  decreases

  গ

  remains same

  ঘ

  may increase or decrease
• Which of the following constituents of coal is the most important in the production of coke?
  ক

  ash

  খ

  moisture

  গ

  Volatiles

  ঘ

  carbon
• Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
  ক

  friability & oxygen content

  খ

  caking index

  গ

  yield of carbonized products

  ঘ

  calorific value
• Fixed carbon in coal is defined as
  ক

  that present in volatile matters

  খ

  the total quantity of carbon present in ash

  গ

  hundred minus the percentage of volatile matter ash & moisture

  ঘ

  the one which is present in the residue after ash formed
• Main constituents of benzol are
  ক

  benzene, toluene & xylene

  খ

  tar & creosote

  গ

  anthracene & phenol

  ঘ

  ammonia & phenol
• L.D. Converters are generally lined with
  ক

  magnesite

  খ

  fireclay

  গ

  chrome magnesite

  ঘ

  silica
• Percentage of methane in coke oven gas may be around
  ক

  5

  খ

  25

  গ

  15

  ঘ

  35
• Presence of free moisture in coal during its high temperature carbonisation
  ক

  protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls

  খ

  reduces the coking time

  গ

  increases the loss of fine coal dust from the ovens when charging

  ঘ

  none of these
• During combustion of gaseous fuels, deficiency of air
  ক

  does not affect the flame length

  খ

  increases the flame temperature

  গ

  tends to shorten the flame

  ঘ

  lengthens the flame