A. 700
B. 1000
C. 1600
D. 2000
0
Which is an acidic refractory ?
0
Which is a neutral refractory ?
A. Magnesite
B. Dolomite
C. Fireclay
D. Chrome magnesite
0
Which is not an acidic refractory ?
A. Graphite
B. Magnesite chrome
C. Silica
D. Magnesia
0
Magnesite refractories are generally not used in the__________________?
A. Silica
B. Fireclay
C. High alumina refractory
D. Carbon black
0
Thermal conductivity of refractory bricks____________________?
A. Electric furnace walls
B. Steel melting furnace
C. Open hearth furnace
D. Burning zone of cement kilns
0
Which form of silica has the highest specific gravity ?
A. Increases with decrease in porosity
B. Decreases with decreases in porosity
C. Is independent of its porosity and is maximum for insulating bricks
D. Increases with the amount of air entrapped in pores
0
Fireclay bricks are not used in the_________________?
A. Quartz
B. Cristobalite
C. Tridymite
D. All have the same specific gravity
0
Permeability of bricks is a measure of the___________________?
A. Blast furnace
B. Hot blast stove
C. Cupola
D. Wall of coke oven
0
Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
A. Refractoriness
B. Melting point
C. Rate at which a fluid will pass through the pores
D. Expansion during heating
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