Related Questions

Magnesite refractories are used for the construction of those furnaces, which are
A Not required to resist the corrosive action of basic slag
B Not subjected to fluctuation in temperature
C Used for raising & maintaining high temperature
D Both (B) and (C)
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
Magnesite chrome refractories
A Have better spalling resistance than chrome magnesite refractories
B Have very low thermal co-efficient of expansion
C Are not at all resistant to the corrosive action of iron oxide
D Have very low (50 kg/cm2) cold crushing strength (C.C.S.) and can not be used in metalcase form
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
A Beryllia
B Carborundum
C Corundum
D Thoria
Chrome magnesite is not used in the
A Inner lining of L.D. converter
B Aluminium melting furnaces
C Wear out lining of steel melting furnaces
D All of the above
Chrome magnesite brick is not used for lining the
A Hearth of soaking pits
B Bottom hearth of reheating furnace
C Coke oven regenerator
D Burning zone of limestone rotary kilns
Magnesite chrome bricks are used in the
A Roof lining of basic open hearth & other basic furnaces
B Reheating furnaces
C Soaking pits
D All of the above
Magnesite bricks are used in those parts of furnaces, which are
A Subjected to temperature fluctuation
B Required to resist corrosive basic slag
C Subjected to high load
D None of these
Chrome magnesite bricks are used in the
A Side walls of soaking pits and arc furnaces
B Copper melting furnaces & converters
C Burner block of glass tanks
D All of the above

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