Related Questions

Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Carbon refractories
A Do not burn/oxidise, when exposed to air on heating
B Are not attacked by slags, as they are not wetted by melts
C Do not resist temperature fluctuations
D Have extremely low thermal & electrical conductivities
Carbon refractories have very high
A Wetting characteristics
B Refractoriness
C Thermal conductivity
D Both B and C
Graphite or carbon refractories
A Exihibit wetting characteristics
B Should be used in neutral or reducing atmosphere
C Exhibit high shrinkage on thermal treatment
D Are not resistant to corrosion by slag
Magnesite refractories are generally not used in the
A Electric furnace walls
B Steel melting furnace
C Open hearth furnace
D Burning zone of cement kilns
Silicon carbide refractories are used in the
A Muffle furnace
B Zinc smelting furnace
C Ceramic recuperators
D All of the above
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
Silica refractories are not used in
A Coke oven walls
B Beehive coke ovens
C Dome and upper portion of B.F. stoves
D Open hearth furnace roof
High alumina refractories are used in the
A Dome of blast furnace stoves
B Electric arc furnace roof
C Glass melting furnaces
D All of the above
Refractories used in/for __________ should have low thermal conductivity.
A Coke ovens
B Insulation
C Regenerators
D Muffle furnaces

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