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