Which one contains minimum percentage of SiO2 ?
Which one contains minimum percentage of SiO2 ? A. FirebrickB. Sillimanite C. Semi-silica D. Aluminous firebrick
Which one contains minimum percentage of SiO2 ? A. FirebrickB. Sillimanite C. Semi-silica D. Aluminous firebrick
___________________ is the measure of the strength of refractory under the combined effect of temperature & load ? A. PorosityB. RUL C. Specific gravity D. Thermal conductivity
Which of the following is not a high alumina refractory material ? A. Kyanite B. Sillimanite C. DiasporeD. Periclase
Which is not a natural insulating material ? A. Diatomaceous earth/kieselgur B. Asbestos C. VermiculiteD. None of these
Magnesite bricks have poor resistance to attack by _____________ slag? A. Lime B. BasicC. Acid D. None of these
______________ bricks should not be used in oxidising atmosphere? A. Tar dolomiteB. Carbon C. Silica D. Fireclay
With decrease in porosity, the ______________ of the refractories decreases? A. Strength B. Thermal conductivityC. Spalling resistance D. None of these
Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks? A. SilicaB. Fireclay C. Magnesite D. Zirconia
The maximum linear expansion of silica bricks during firing is about ______________ percent? A. 0.5 B. 1 C. 2D. 3.5
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks? A. FireclayB. Silica C. Dolomite D. Very low alumina