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 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
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)
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Magnesite bricks have poor resistance to attack by __________ slag.
A Lime
B Basic
C Acid
D None of these
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
A Fireclay
B Carborundum
C Graphite
D Chromite
Refractories used in/for __________ should have low thermal conductivity.
A Coke ovens
B Insulation
C Regenerators
D Muffle furnaces
silicon carbide refractories have very low
A [

A. Refractoriness (

B. Thermal conductivity

B Resistance to thermal shock
C None of these
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

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