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MCQs

Total Questions : 868 | Page 8 of 87 pages
Question 71. Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
  1.    Mortars
  2.    Cements
  3.    Castables
  4.    None of these
 Discuss Question
Answer: Option C. -> Castables
Question 72. Insulating refractories should have
  1.    High porosity
  2.    Low thermal conductivity
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option B. -> Low thermal conductivity
Question 73. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
  1.    Hearth of the blast furnace
  2.    Nuclear reactors, missiles & space crafts
  3.    Insulation of high temperature furnaces
  4.    Roof of electric furnaces
 Discuss Question
Answer: Option B. -> Nuclear reactors, missiles & space crafts
Question 74. Basic bricks are not made of
  1.    Fireclay
  2.    Magnesite
  3.    Foresterite
  4.    Chromite
 Discuss Question
Answer: Option A. -> Fireclay
Question 75. Alumina-graphite bricks are used for lining the
  1.    Slide gate in teeming laddies
  2.    Continuous casting systems
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 76. Firing temperature of magnesite bricks is about __________ °C.
  1.    800-1000
  2.    1000-1200
  3.    1600-1800
  4.    2400-2600
 Discuss Question
Answer: Option C. -> 1600-1800
Question 77. Maximum safe working temperature for fireclay bricks is about __________ °C.
  1.    1150
  2.    1300
  3.    1450
  4.    1550
 Discuss Question
Answer: Option D. -> 1550
Question 78. Chemically, mullite refractories is
  1.    3Al2O₃.2SiO₂
  2.    Al2O₃
  3.    ZrSO₄
  4.    ThO₂
 Discuss Question
Answer: Option A. -> 3Al2O₃.2SiO₂
Question 79. Carbon refractories
  1.    Do not burn/oxidise, when exposed to air on heating
  2.    Are not attacked by slags, as they are not wetted by melts
  3.    Do not resist temperature fluctuations
  4.    Have extremely low thermal & electrical conductivities
 Discuss Question
Answer: Option B. -> Are not attacked by slags, as they are not wetted by melts
Question 80. Carbon refractory blocks
  1.    Are wetted by molten iron
  2.    Are used in the hearth of blast furnace
  3.    Are acidic in nature
  4.    All of the above
 Discuss Question
Answer: Option B. -> Are used in the hearth of blast furnace

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