Fusion temperature of pure silica (SiO2) is _______________ °C?
Fusion temperature of pure silica (SiO2) is _______________ °C?
A. 1350
B. 1715
C. 2570
D. 2800
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Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?A. Washing action of metal
B. Corrosion by layer of slag
C. Both A. & B.
D. Neither A. nor B.Refractory materials are never used in the construction of _________________?
Refractory materials are never used in the construction of _________________?A. Segar cones
B. Orton cones
C. Pressure vessels
D. Ovens & retortsWith increase in the porosity, thermal spalling resistance of fireclay brick___________________?
With increase in the porosity, thermal spalling resistance of fireclay brick___________________?A. Increases
B. Decreases
C. Remain same
D. May increase or decreaseInsulating refractories should have_______________?
Insulating refractories should have_______________?A. High porosity
B. Low thermal conductivity
C. Both A. and B.
D. Neither A. not B.Refractories are dried in the _______________?
Refractories are dried in the _______________?A. Rotary kilns
B. Tunnel kilns
C. Sun
D. None of theseFireclay bricks are used in the__________________?
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