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Refractory Technology
Quiz 2
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Q.1
Which is an acidic refractory?
Magnesite
Dolomite
Fireclay
Chrome magnesite
Q.2
Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant?
Soaking pits
Ceheating furnace
L.D. converter
Rotary lime kiln
Q.3
Grog
Contains both alumina and silica
Iscrushed firebrick
Is a non-plastic material
All of the above
Q.4
Refractories used in/for __________ should have low thermal conductivity.
Coke ovens
Insulation
Regenerators
Muffle furnaces
Q.5
Ferromagnetic ceramic material is not used in the
Thermal insulation
Transformers
Magnetic switches
Television sets
Q.6
Electrical resistor bars are made of
Silicon carbide
Alumina
Zirconia
Graphite
Q.7
Chrome magnesite brick is not used for lining the
Hearth of soaking pits
Bottom hearth of reheating furnace
Coke oven regenerator
Burning zone of limestone rotary kilns
Q.8
With increase in the porosity, thermal spalling resistance of fireclay brick
Increases
Decreases
Remains same
May increase or decrease
Q.9
Use of higher percentage of lime for bonding silica bricks, reduces their
Strength
Abrasion resistance
Both A & B
Neither A nor B
Q.10
'Super refractories' are made from pure
Carbides
Oxides
Borides
Nitrides
Q.11
Pyrometric cone equivalent (PCE) of a refractory is the measure of its
Spalling resistance
Fusion point
Resistance to slag penetration
Resistance to carbon monoxide attack
Q.12
Panel test determines the __________ of refractories.
Fusion point
Spalling resistance
Slag penetration resistance
Refractoriness under load (RUL)
Q.13
Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm².
10
100
500
1000
Q.14
Ganister is a source of the
Silica
Periclase
Lime
None of these
Q.15
Faster rate of drying of moulded refractories results in high __________ of refractories.
Green strength
Voids
Shrinkage
Both B and C
Q.16
Grog addition in fireclay during brick manufacture is done to
Reduce its shrinkage on heating
Impart greater spalling resistance
Enhance the strength of fired refractories
All of the above
Q.17
The maximum linear expansion of silica bricks during firing is about __________ percent.
0.5
1
2
3.5
Q.18
Si percentage in silica refractories used in the walls of coke oven is about
45
60
80
95
Q.19
Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
Thermal spalling
Slag attack
Fusion under load
CO attack
Q.20
To resist spalling tendency, a refractory should have
Greater diffusivity
Low specific heat
Low thermal co-efficient of expansion
All of the above
Q.21
The largest consumer of refractories is the __________ industry.
Cement
Metallurgical
Fertiliser
Power
Q.22
Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C.
500
1000
>1350
>2000
Q.23
Thermal conductivity of refractory bricks
Increases with decrease in porosity
Decreases with decreases in porosity
Is independent of its porosity and is maximum for insulating bricks
Increases with the amount of air entrapped in pores
Q.24
Thermal spalling mainly occurs during __________ of furnaces.
Cooling down
Warming up
Both A & B
Neither A nor B
Q.25
Chrome magnesite bricks are used in the
Side walls of soaking pits and arc furnaces
Copper melting furnaces & converters
Burner block of glass tanks
All of the above
Q.26
The highest melting pure oxide (m.p. > 3000°C) is
Thoria
Alumina
Beryllia
Zirconia
Q.27
Dolomite bricks have good resistance to attack by
Molten steel
Iron oxide
Lime slag
None of these
Q.28
Mullite is chemically represented by
Al2O₃ . 2SiO₂
3Al2O₃ . 2SiO₂
Al2O₃ . SiO₂
2Al2O₃ . 3SiO₂
Q.29
Refractory materials are never used in the construction of
Segar cones
Orton cones
Pressure vessels
Ovens & retorts
Q.30
Refractoriness under load (RUL) is the most important property for the refractory bricks
At the hearth bottom of the furnace on which stock is placed
Used for furnace insulation
Used in the roof of the furnace
None of these
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