A. High refractoriness
B. High resistance to spalling
C. High strength and density
D. All A., B. and C.
Related Mcqs:
- Outer combustion chamber of blast furnace stove is lined with _____________ bricks?
A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia - Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?
A. Silica
B. Fireclay
C. Magnesite
D. Zirconia - Semi-silica bricks compared to silica bricks have_______________?
A. Less fusion point
B. Better spalling resistance
C. Both A. and B.
D. Neither A. not B. - Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
A. High duty fireclay
B. Silica
C. Mullite
D. Carborundum - ____________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?
A. High thermal conductivity
B. Low porosity
C. Non-wetting characteristics
D. High density - Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?
A. Non-wetting characteristic
B. High thermal conductivity
C. High crushing strength
D. None of these - Roof of a basic open hearth furnace is lined with ______________ bricks?
A. Silica
B. Fireclay
C. Dolomite
D. Magnesite - Roof of a basic electric furnace is made of _____________ bricks?
A. Superduty fireclay
B. Silica
C. Chromite
D. None of these - Which of the following bricks should not be used, if the furnace is to be used intermittently ?
A. Firebricks
B. Silica bricks
C. Silicon carbide bricks
D. Sillimanite - Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?
A. 1800
B. 2200
C. 2400
D. 2700
