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.Management Sciences
Category: Refractory Technology
Which one contains maximum percentage of Al2O3 ?
A. Firebrick
B. Sillimanite
C. Magnesite
D. Aluminous firebrick
Which is not an acidic refractory ?
A. Silica
B. Fireclay
C. High alumina refractory
D. Carbon black
RUL of refractories depends on the _____________________?
A. Chemical composition
B. Physical structure
C. Presence of impurities like iron & alkali
D. All A., B. and C.
Outer combustion chamber of blast furnace stove is lined with _____________ bricks?
A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia
Dilatometer is used for the determination of ______________ of refractories?
A. Modulus of rupture
B. Permanent linear change
C. Resistance to CO attack
D. RUL
Use of higher percentage of lime for bonding silica bricks, reduces their__________________?
A. Strength
B. Abrasion resistance
C. Both A. & B.
D. Neither A. nor B.
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 walls
Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?
A. Thermal spalling
B. Slag attack
C. Fusion under load
D. CO attack
Carbon refractories are exclusively used in the_________________?
A. Hearth of blast furnace
B. Walls of coke oven
C. Regenerators of coke oven
D. Side wall of soaking pits
Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?
A. Silica
B. Fireclay
C. Magnesite
D. Zirconia
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