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.Management Sciences
Category: Refractory Technology
Which of the following is not a high alumina refractory material ?
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A. Kyanite
B. Sillimanite
C. Diaspore
D. Periclase
Vacuum steel degassing units are lined with__________________?
A. Silica bricks
B. Low duty firebricks
C. High alumina bricks
D. Graphite blocks
Magnesite refractories are used for the construction of those furnaces, which are________________?
A. Not required to resist the corrosive action of basic slag
B. Not subjected to fluctuation in temperature
C. Used for raising & maintaining high temperature
D. Both B. and C.
Fusion point of an acidic refractory material is________________?
A. Increased by the addition of basic oxides
B. Reduced by the addition of basic oxides
C. Not affected by the addition of basic oxides
D. Always more than 2500°C
Roof of a basic open hearth furnace is lined with ______________ bricks?
A. Silica
B. Fireclay
C. Dolomite
D. Magnesite
Firing temperature is minimum (1250-1400 °C) for _______________ bricks?
A. Fireclay
B. Direct bonded basic
C. Silica
D. Magnesite
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?
A. Fireclay
B. Silica
C. Dolomite
D. Very low alumina
Which is not a natural insulating material ?
A. Diatomaceous earth/kieselgur
B. Asbestos
C. Vermiculite
D. None of these
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