Related Questions

Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
A 55
B 70
C 80
D 90
With increase in the alumina content, the refractoriness of high alumina refractories
A Increases
B Decreases
C Remains same
D May increase or decrease
Maximum alumina content in high alumina refractory can be as high as __________ percent.
A 30
B 50
C 70
D 90
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
With increase in the alumina content in firebricks, its fusion point (refractoriness)
A Decreases linearly
B Remains unchanged
C Increases
D Decreases
High alumina refractories are used in the
A Dome of blast furnace stoves
B Electric arc furnace roof
C Glass melting furnaces
D All of the above
Refractoriness/fusion points of 'superduty' refractories is __________ °C.
A 1520-1630
B 1630-1670
C > 1730
D > 2000
Fusion of bauxite and __________ produces high alumina cement.
A Alum
B Limestone
C Coke
D Quartz
Fusion of limestone and __________ produces high alumina cement.
A Sand
B Bauxite
C Quicklime
D Calcite
Spalling tendency of refractories is reduced by increasing its
A Porosity
B Specific gravity
C Thermal conductivity
D Strength

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