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
Fusion of limestone and __________ produces high alumina cement.
A Sand
B Bauxite
C Quicklime
D Calcite
With increasing alumina content, the fusion point of high alumina refractories
A Increases
B Decreases
C Remains constant
D May increase or decrease ; depends on its alumina content
Maximum alumina content in high alumina refractory can be as high as __________ percent.
A 30
B 50
C 70
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
As compared to ordinary portland cement, high alumina cement has
A Higher initial setting time but lower final setting time
B Lower initial setting time but higher final setting time
C Higher initial and final setting times
D Lower initial and final setting times
Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is
A 5CaO . 3Al2O3
B 3CaO . Al2O3
C 3CaO . SiO2
D 2CaO . SiO2
K produces 100 parts twice as fast as G does. G produces 100 parts in 40 minutes. If each produces parts at a constant rate, how many parts will K produces in 6 minutes.
A 30
B 25
C 20
D 15
With increase in the alumina content in firebricks, its fusion point (refractoriness)
A Decreases linearly
B Remains unchanged
C Increases
D Decreases
For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
A 1 : 2
B 1 : 3
C 1 : 4
D 1 : 6

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