Which is the stable form of silica below 870°C ?
Which is the stable form of silica below 870°C ?
A. Tridymite
B. Cristobalite
C. Quartz
D. None of these
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Natural silica___________________?
Natural silica___________________?A. Mainly contains quartz
B. Is not stable at high temperature
C. Transforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high
volume changes
D. All A., B. and C.Fireclay bricks are used in the__________________?
Fireclay bricks are used in the__________________?A. Coke ovens regenerator
B. Outer lining of L.D. converter
C. Hearth bottom of blast furnace
D. Coke oven wallsChemically, mullite refractories is____________________?
Chemically, mullite refractories is____________________?A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2High alumina refractories are used in the ___________________?
High alumina refractories are used in the ___________________?A. Dome of blast furnace stoves
B. Electric arc furnace roof
C. Glass melting furnaces
D. All A., B. and C.Which one expands on heating ?
Which one expands on heating ?A. Silica bricks
B. Fireclay bricks
C. Both A. & B.
D. Neither A. nor B.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