Colour of fireclay bricks is_________________?
Colour of fireclay bricks is_________________?
A. Light buff to reddish buff
B. Yellow
C. Black
D. None of these
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High density refractory bricks have lower__________________?
High density refractory bricks have lower__________________?A. Spalling resistance
B. Thermal conductivity
C. Fusion point
D. Slag penetration resistanceCarbon refractory blocks ___________________?
Carbon refractory blocks ___________________?A. Are wetted by molten iron
B. Are used in the hearth of blast furnace
C. Are acidic in nature
D. All A., B. and C.Zirconia refractory_________________?
Zirconia refractory_________________?A. Does not react with basic slags
B. Is produced from baddeleyite
C. Cannot be used as an insulator
D. Has poor electrical conductivity at high temperatureThermal 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 poresCold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?A. 450
B. 250
C. 150
D. 65Fireclay refractories have __________________?
Fireclay refractories have __________________?A. Low co-efficient of thermal expansion
B. Poor thermal spalling resistance
C. Tendency to expand unduly high during firing
D. Very high cost