Ganister is a source of the ________________?
Ganister is a source of the ________________?
A. Silica
B. Periclase
C. Lime
D. None of these
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Chemically, mullite refractories is____________________?
Chemically, mullite refractories is____________________?A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2Which is required in an insulating refractory ?
Which is required in an insulating refractory ?A. High thermal conductivity
B. Low porosity
C. Both A. and B.
D. Neither A. nor B.The highest melting pure oxide (m.p. > 3000°C)is___________________?
The highest melting pure oxide (m.p. > 3000°C)is___________________?A. Thoria
B. Alumina
C. Beryllia
D. ZirconiaCrushing strength of a refractory____________________?
Crushing strength of a refractory____________________?A. Increases with rise in service temperature
B. Decreases with rise in service temperature
C. Is unaffected with change in service temperature
D. Decreases with increase in porosity______________ bricks should not be used in oxidising atmosphere?
______________ bricks should not be used in oxidising atmosphere?A. Tar dolomite
B. Carbon
C. Silica
D. FireclayWith increasing alumina content, the fusion point of high alumina refractories__________________?
With increasing alumina content, the fusion point of high alumina refractories__________________?A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on its alumina content