SiO2 percentage in firebrick is about____________________?
SiO2 percentage in firebrick is about____________________?
A. 35-40
B. 55-60
C. 80-85
D. > 94
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Which of the following impurities reduces the refractoriness of magnesite bricks ?
Which of the following impurities reduces the refractoriness of magnesite bricks ?A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C.Lower part of hot metal mixer are lined with _____________ bricks?
Lower part of hot metal mixer are lined with _____________ bricks?A. Superduty fireclay
B. High alumina
C. Silica
D. CarborundumWhich brick undergoes maximum shrinkage on drying ?
Which brick undergoes maximum shrinkage on drying ?A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Magnesite bricks
D. Chromite bricksRUL of refractories depends on the _____________________?
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.Magnesite refractories are used for the construction of those furnaces, which are________________?
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.Segar cones are used for the determination of ____________ of refractories?
Segar cones are used for the determination of ____________ of refractories?A. Softening temperature
B. Spalling resistance
C. Electrical conductivity
D. Resistance to slag attack