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
Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -
A 5 : 8
B 10 : 9
C 8 : 5
D 9 : 10
Hot face insulating linings of high purity alumina fused mullite are used, where
A Very high temperatures are involved
B Highly reducing conditions are involved
C Presence of iron or silica is harmful
D All of the above
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
Corundum and Cryolite are important ores of which of the following metals?
A Silver
B Iron
C Aluminium
D Tin
The metallurgical process in which a metal is obtained in a fused state is called
A smelting
B roasting
C calcinations
D froth floatation
Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used
A As a lubricant
B As a rust preventive
C In hard water for cleaning of cloth
D As a foam depressant in distillation column
Aluminium bronze contains aluminium and copper in the ratio of
A 50 : 50
B 40 : 60
C 60 : 40
D 10 : 90

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