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/cm<sup>2</sup>) cold crushing strength (C.C.S.) and can not be used in metalcase form

Correct Answer: Have better spalling resistance than chrome magnesite refractories

Bissoy MCQ
#Chemical Engineering #Refractory Technology

Related Questions

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
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 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 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
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
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
A Preheating
B Cooling
C Burning
D All of the above
Chrome magnesite bricks are
A Acidic in nature
B Neutral in nature
C Having higher RUL than silica bricks
D Made by mixing 30% chromite and 70% periclase
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
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
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C

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