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.Management Sciences
Category: Refractory Technology
Faster rate of drying of moulded refractories results in high _____________ of refractories?
A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C.
Cold crushing strength of refractories depends upon its_________________?
A. Composition
B. Texture
C. Firing temperature
D. All A., B. and C.
Conversion of silica mineral to Cristobalite is accompanied by reduction in its ____________________?
A. Volume
B. Specific gravity
C. Both A. & B.
D. Neither A. nor B.
Fusion point of a basic refractory material is__________________?
A. Reduced by the addition of acid oxides
B. Increased by the addition of acid oxides
C. Not affected by the addition of acid oxides
D. Always less than 1000°C
_____________ nozzles are used in continuous casting of steel?
A. Zircon
B. Thoria
C. Carborundum
D. Beryllia
Which of the following is not a high alumina refractory material ?
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
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