Refractory Technology Questions

• Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
• Pick out the wrong statement.
• Faster rate of drying of moulded refractories results in high __________ of refractories.
• Which is a neutral refractory?
• Thermal spalling mainly occurs during __________ of furnaces.
• __________ bricks should not be used in oxidising atmosphere.
• With increase in the density of silica refractories, its
• Fireclay bricks is not used for lining the
• Fusion temperature of pure silica (SiO2) is __________ °C.
• __________ is not a single oxiderefractory.
• The highest melting pure oxide (m.p. > 3000°C)is
• Natural silica
• Bottom of basic open hearth furnace are constructed of
• Refractories used in/for __________ should have low thermal conductivity.
• Magnesite refractories are generally not used in the
• Carborundum used for making crucibles for melting non-ferrous metals is chemically
• Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
• Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
• Refractory bricks with lower permeability is produced by using
• Which is not a natural insulating material?