A. Refractoriness (< 1700°C)
B. Thermal conductivity
C. Resistance to thermal shock
D. None of these
Related Mcqs:
- 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 - Silicon carbide refractories are used in the _____________?
A. Muffle furnace
B. Zinc smelting furnace
C. Ceramic recuperators
D. All A., B. and C. - The main raw material for manufacture of silicon carbide refractories is_________________?
A. Corundum
B. Carborundum
C. Bauxite
D. Periclase - Faster rate of drying of moulded refractories results in high _____________ of refractories?
A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C. - Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?
A. Fireclay
B. Carborundum
C. Graphite
D. Chromite - Magnesite refractories have low resistance to___________________?
A. Attack by basic slag
B. Abrasion
C. Disintegration on sudden change of temperature
D. Both B. and C. - High alumina refractories are used in the ___________________?
A. Dome of blast furnace stoves
B. Electric arc furnace roof
C. Glass melting furnaces
D. All A., B. and C. - Segar cones are used for the determination of ____________ of refractories?
A. Softening temperature
B. Spalling resistance
C. Electrical conductivity
D. Resistance to slag attack - Zircon refractories have__________________?
A. Low co-efficient of expansion
B. High RUL (1600°C) and refractoriness (> 2000°C)
C. High spalling resistance
D. All A., B. and C. - The largest consumer of refractories is the _______________ industry?
A. Cement
B. Metallurgical
C. Fertiliser
D. Power
