Related Questions

Maximum alumina content in high alumina refractory can be as high as __________ percent.
A 30
B 50
C 70
D 90
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
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
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
With increase in the alumina content, the refractoriness of high alumina refractories
A Increases
B Decreases
C Remains same
D May increase or decrease
An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
The metallic aluminium is obtained from pure alumina in the presence of fused cryolite by
A Electrolysis
B Electrolytic reduction
C Electrolytic oxidation
D None of these
A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A Increase
B Decrease
C Remain unaffected
D May increase or decrease; depends on the thickness of each layer
Mullite is chemically represented by
A Al2O3.2SiO2
B 3Al2O3.2SiO2
C Al2O3.SiO2
D 2Al2O3.3SiO2
Chemically, mullite refractories is
A 3Al2O3.2SiO2
B Al2O3
C ZrSO4
D ThO2

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