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Refractory Technology
Quiz 5
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Q.1
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
Washing action of metal
Corrosion by layer of slag
Both A & B
Neither A nor B
Q.2
Spalling resistance of a refractory can not be increased by
Increasing its porosity
Using a coarser grog during its manufacture
Decreasing its thermal co-efficient of expansion
Making it denser
Q.3
Hollow refractory bricks are made by
Slip casting
Hand moulding
Pressing/machine moulding
Extrusion
Q.4
Which property of refractories is the most important for top section of the blast furnace?
Resistance to abrasion
Resistance to slag peneration
Stability of volume at high temperature
Resistance to corrosion by slag
Q.5
Carbon bricks are not used in the lining of the
Combustion chamber of blast furnace stoves
Electric furnaces
Highly chemical resistant equipments
Blast furnace hearth
Q.6
Zirconia refractories are not used in
Making sheaths for thermocouple
Lining high temperature ceramic kilns
Furnaces subjected to fluctuating temperature
High frequency induction furnaces in the form of inductors
Q.7
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
Fireclay
Carborundum
Graphite
Chromite
Q.8
Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
770
570
270
70
Q.9
PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
1520
1630
1670
1730
Q.10
Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
Aluminium phosphate
Water
Lime
Plaster of paris
Q.11
Permeability of bricks is a measure of the
Refractoriness
Melting point
Rate at which a fluid will pass through the pores
Expansion during heating
Q.12
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
Fireclay
Silicon carbide
Corrundum
Siliceous fireclay
Q.13
Cold crushing strength of refractories depends upon its
Composition
Texture
Firing temperature
All of the above
Q.14
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
Preheating
Cooling
Burning
All of the above
Q.15
Which one contains maximum percentage of Al2O₃ ?
Firebrick
Sillimanite
Magnesite
Aluminous firebrick
Q.16
Which brick undergoes maximum shrinkage on drying?
Tar bonded dolomite bricks
Fireclay bricks
Magnesite bricks
Chromite bricks
Q.17
Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.
Silica
Fireclay
Magnesite
Zirconia
Q.18
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
Bakelite impregnated or fused periclase
Silica
Semi-silica
Fireclay
Q.19
Which of the following is not a neutral refractory?
Silicon carbide
Magnesite
Chromite
Graphite
Q.20
Which is not an acidic refractory?
Silica
Fireclay
High alumina refractory
Carbon black
Q.21
Hot face insulating linings of high purity alumina fused mullite are used, where
Very high temperatures are involved
Highly reducing conditions are involved
Presence of iron or silica is harmful
All of the above
Q.22
With increase in the alumina content in firebricks, its fusion point (refractoriness)
Decreases linearly
Remains unchanged
Increases
Decreases
Q.23
Magnesite bricks have poor resistance to attack by __________ slag.
Lime
Basic
Acid
None of these
Q.24
Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.
1380
1520
1710
1915
Q.25
Addition of zircon to silica refractory brick improves its
Crushing strength
Resistance to slag attack
Neither A nor B
Neither A nor B
Q.26
__________ is not a single oxiderefractory.
Zirconia
Silicon carbide
Magnesia
None of these
Q.27
Roof of a basic open hearth furnace is lined with __________ bricks.
Silica
Fireclay
Dolomite
Magnesite
Q.28
Bauxite calcining rotary kilns are lined with __________ bricks.
Fireclay
Carbon
85% alumina
Corundum
Q.29
Lower part of hot metal mixer are lined with __________ bricks.
Superduty fireclay
High alumina
Silica
Carborundum
Q.30
Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² .
450
250
150
65
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