A. Beehive coke oven
B. By-product coke oven walls
C. Combustion chamber of B.F. stoves
D. Coke oven regenerators
Fireclay bricks are not used in the _________________? Read More »
Refractory Technology A. Increases
B. Lowers
C. Does not affect
D. Either A. or B.; depends on its quantity
Presence of MgO in alumino-silicate refractories _______________ its refractoriness? Read More »
Refractory Technology A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2
Chemically, mullite refractories is____________________? Read More »
Refractory Technology A. Fusion point
B. Spalling resistance
C. Slag penetration resistance
D. Refractoriness under load (RUL)
Panel test determines the _____________ of refractories? Read More »
Refractory Technology A. 30
B. 50
C. 70
D. 90
A. 5
B. 20
C. 40
D. 55
A. Stable form of silica upto 870°C
B. Converted to Tridymite on firing between 870 to 1470°C
C. Transformed to Cristobalite on heating above 1470°C
D. All A., B. and C.
Quartz is___________________? Read More »
Refractory Technology A. Cost
B. Electrical conductivity
C. Thermal conductivity
D. Fusion point
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease
A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000
Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C? Read More »
Refractory Technology