Maximum safe working temperature for fireclay bricks is about __________ °C?
Maximum safe working temperature for fireclay bricks is about __________ °C?
A. 1150
B. 1300
C. 1450
D. 1550
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Which is the stable form of silica upto 1470°C ?
Which is the stable form of silica upto 1470°C ?A. Quartz
B. Cristobalite
C. Tridymite
D. None of theseCeramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?A. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclayThermal spalling mainly occurs during _____________ of furnaces?
Thermal spalling mainly occurs during _____________ of furnaces?A. Cooling down
B. Warming up
C. Both A. & B.
D. Neither A. nor B.Which of the following bricks has the most close values of RUL and PCE ?
Which of the following bricks has the most close values of RUL and PCE ?A. Silica bricks
B. Fireclay bricks
C. High alumina bricks
D. Tar dolomite bricksThermal 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 poresVacuum steel degassing units are lined with__________________?
Vacuum steel degassing units are lined with__________________?A. Silica bricks
B. Low duty firebricks
C. High alumina bricks
D. Graphite blocks