Which is a basic refractory ?
Which is a basic refractory ?
A. Fireclay
B. Silica
C. Chrome magnesite
D. None of these
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Thermal conductivity of refractory bricks_________________?
Thermal conductivity of refractory bricks_________________?A. Increases with decrease in porosity
B. Decreases with decreases in porosity
C. Is independent of its porosity and is maximum for insulating bricks
D. Increases with the amount of air entrapped in poresInsulating refractories should have_______________?
Insulating refractories should have_______________?A. High porosity
B. Low thermal conductivity
C. Both A. and B.
D. Neither A. not B.An ideal refractory should have high__________________?
An ideal refractory should have high__________________?A. Spalling rate
B. Fusion point
C. Shrinkage ability
D. None of thesePericlase refractory contains mainly________________?
Periclase refractory contains mainly________________?A. CaO
B. MgO
C. Al2O3
D. SiO2Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent?
Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent?A. 2-3
B. 5-7
C. 7-12
D. 14-20___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?
___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?A. Porosity
B. RUL
C. Specific gravity
D. Thermal conductivity