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 temperature
Related Mcqs:
- Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?
A. Mortars
B. Cements
C. Castables
D. None of these - Zirconia refractories are not used in_____________________?
A. Making sheaths for thermocouple
B. Lining high temperature ceramic kilns
C. Furnaces subjected to fluctuating temperature
D. High frequency induction furnaces in the form of inductors - Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?
A. 1800
B. 2200
C. 2400
D. 2700 - Machine moulding of dry mixture of refractories requires a pressure of the order of _____________ kg/cm2?
A. 10
B. 100
C. 500
D. 1000 - Which is the stable form of silica upto 1470°C ?
A. Quartz
B. Cristobalite
C. Tridymite
D. None of these - Fireclay bricks are never used in the______________?
A. Beehive oven
B. Coke oven walls
C. Zinc roaster
D. Lead blast furnace - High density refractory bricks have lower__________________?
A. Spalling resistance
B. Thermal conductivity
C. Fusion point
D. Slag penetration resistance - . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?
A. 500
B. 1000
C. >1350
D. >2000 - Colour of fireclay bricks is_________________?
A. Light buff to reddish buff
B. Yellow
C. Black
D. None of these - Fireclay bricks are used in the__________________?
A. Coke ovens regenerator
B. Outer lining of L.D. converter
C. Hearth bottom of blast furnace
D. Coke oven walls
