Sintering and Compacting, Pig Iron and its Manufacture MCQ

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• _____________ is a flux used in iron smelting.
  ক

  Silica

  খ

  Caesium

  গ

  Dolomite

  ঘ

  Mica
• Which is the iron ore processed in blast furnaces?
  ক

  Hematite

  খ

  Magnesia

  গ

  Alumina

  ঘ

  Silica
• The smelting zone of the furnace is called as _________
  ক

  Tuyere

  খ

  Inwall

  গ

  Bosh

  ঘ

  Hearth
• How much manganese does ferromanganese contain?
  ক

  10-16%

  খ

  22-32%

  গ

  45-62%

  ঘ

  74-82%
• Why is sulfur in pig iron kept low?
  ক

  Steel impurity

  খ

  Electrical resistivity

  গ

  Demagnetizing effect

  ঘ

  Low coefficient of expansion
• How much carbon does pig iron contain?
  ক

  0.1-1.0%

  খ

  0.3-0.7%

  গ

  1-3%

  ঘ

  3-4%
• The size of pig iron is _________ (in inches).
  ক

  10*6*2

  খ

  20*9*4

  গ

  15*12*6

  ঘ

  20*14*8
• Impregnation of sintered parts is usually done for _________
  ক

  2-5 minutes

  খ

  10-20 minutes

  গ

  30-50 minutes

  ঘ

  80-120 minutes
• _________ is the process done to reduce the void space in the sintered part.
  ক

  Sizing

  খ

  Coining

  গ

  Machining

  ঘ

  Infiltration
• For cemented carbide cutting tools, the compact is heated at __________
  ক

  650 F

  খ

  1200 F

  গ

  1989 F

  ঘ

  2750 F
• Sintering is performed ___________
  ক

  At room temperature

  খ

  Below melting point

  গ

  Above boiling point

  ঘ

  At cryogenic temperature
• In gravity compaction, the die is made of _________
  ক

  Graphite

  খ

  Lead

  গ

  Charcoal

  ঘ

  Quartz
• Electrolysis usually used for materials like _________
  ক

  Zinc, cadmium

  খ

  Aluminum, nickel

  গ

  Silver, tin

  ঘ

  Silicon, antimony
• What is the disadvantage of atomization?
  ক

  Electrical resistivity

  খ

  Oxidation

  গ

  Poor mechanical strength

  ঘ

  Coarse grains
• In powder metallurgy, how is the powder for brittle materials prepared?
  ক

  Pulverization

  খ

  Atomization

  গ

  Electrolysis

  ঘ

  Fusion