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
Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
A 10
B 15
C 20
D 30
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
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
Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
A Soaking pits
B Ceheating furnace
C L.D. converter
D Rotary lime kiln
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
Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be
A Oxidising
B Neutral
C Either A or B
D Neither A nor B
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
A 55
B 70
C 80
D 90
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)

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