Refractory Technology Questions

• Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?
• The largest consumer of refractories is the __________ industry.
• Porosity is induced in insulating refractories by adding
• Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
• Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
• Magnesite chrome bricks are used in the
• Ganister is a source of the
• Cold crushing strength of fireclay bricks is about __________ kgf/cm2.
• Spalling of a refractory means its
• High alumina refractories are used in the
• __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
• Magnesite bricks have poor resistance to attack by __________ slag.
• Porosity of silica bricks varies from __________ percent.
• Carbon refractories are exclusively used in the
• Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2 ) is __________ °C.
• Which of the following is not a high alumina refractory material?
• Porosity of fireclay refractories is __________ percent.
• Which one contains minimum percentage of SiO2?
• Zirconia refractories are not used in
• With decrease in porosity, the __________ of the refractories decreases.