Refractory Technology Questions

• Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
• High thermal conductivity of a refractory material is not important, when it is to be used in the
• Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
• Fireclay bricks are never used in the
• The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.
• Si percentage in silica refractories used in the walls of coke oven is about
• Refractoriness under load (RUL) is the most important property for the refractory bricks
• Zircon refractories have
• Electrical resistor bars are made of
• Maximum safe working temperature for fireclay bricks is about __________ °C.
• Tar bonded dolomite bricks
• High density refractory bricks have lower
• Periclase refractory contains mainly
• Carbon refractory blocks
• Fusion point of an acidic refractory material is
• Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
• Cold crushing strength of refractories depends upon its
• Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?
• Which is a basic refractory?
• Silicon carbide refractories are used in the