Related Questions

Segar cones are used for the determination of __________ of refractories.
A Softening temperature
B Spalling resistance
C Electrical conductivity
D Resistance to slag attack
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
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Dilatometer is used for the determination of __________ of refractories.
A Modulus of rupture
B Permanent linear change
C Resistance to CO attack
D RUL
Which property of refractories is the most important for top section of the blast furnace?
A Resistance to abrasion
B Resistance to slag peneration
C Stability of volume at high temperature
D Resistance to corrosion by slag
Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace by
A Increasing the draft in the furnace
B Preheating the fuel gas
C Oxygen enrichment of combustion air
D Preheating the combustion air
The ability of a material to resist softening at high temperature is known as
A Creep
B Hot tempering
C Hot hardness
D Fatigue
A material is capable of resisting softening at high temperature, because of its property termed as
A Hot temper
B Hot hardness
C Fatigue
D Creep
Softening temperature of coal ash is a measure of the __________ of coal.
A Caking tendency
B Coking tendency
C Clinkering tendency
D Size stability
Rate of slag attack on refractories increases with rise in temperature due to the
A Decreased viscosity of slag
B Increased thermal conductivity of brick
C Oxidising condition in the furnace
D None of these

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