Option A: A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous
Option B: Ceramic materials do not undergo vitrification on heating
Option C: Ceramic materials are brittle in nature
Option D: Non-oxide ceramic materials generally act as a semi-conductor
Correct Answer: Ceramic materials do not undergo vitrification on heating ✔
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Option A: Fluxing material like lime is added in clay to reduce the vitrification temperature
Option B: Main constituents of clay are alumina and silica
Option C: Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and
Option D: Vitrification of fireclay material is done to increase its porosity
Correct Answer: Vitrification of fireclay material is done to increase its porosity ✔
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Option A: Electrical conductivity of refractory is not important, when these are to be used in electrical
Option B: Graphite and metals are the good electrical conductor among the refractories and others are all
Option C: Refractories used for lining electrical furnaces should ordinarily have very low electrical
Option D: Electrical conductivity of porous refractory material is low
Correct Answer: A. Electrical conductivity of refractory is not important, when these are to be used in electrical
furnaces ✔
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Option A: Sand & coke is the main raw material for the manufacture of silicon carbide
Option B: Carbon refractories cannot be used in the furnaces operating under reducing conditions
Option C: Mullite can be obtained by the heating of alusite, kyanite or sillimanite
Option D: Silica occurs in nature in all cellular, amorphous or crystalline form
Correct Answer: Carbon refractories cannot be used in the furnaces operating under reducing conditions ✔
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Option A: Refractories used in muffle furnace should have low thermal conductivity
Option B: The electrical resistivity of refractories drops rapidly with rise in temperature
Option C: For reducing spalling tendency, the refractory should be well fired and its porosity should be
Option D: Refractoriness under load (RUL) of a refractory is always less than its refractoriness
Correct Answer: Refractories used in muffle furnace should have low thermal conductivity ✔
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Option A: Insulating refractories used in place of regular refractory bricks are usually called light weight
Option B: Graphite refractories are also called plumbago refractories
Option C: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
Option D: Calcined magnesite is also called dead burnt magnesite
Correct Answer: Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28 ✔
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Option A: Silicon carbide
Option B: Silicon nitride
Option C: Crystalline magnesia
Option D: Zirconium sulphate
Correct Answer: Silicon carbide ✔
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Option A: Refractoriness
Option B: Melting point
Option C: Rate at which a fluid will pass through the pores
Option D: Expansion during heating
Correct Answer: Rate at which a fluid will pass through the pores ✔
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Option A: Blast furnace
Option B: Hot blast stove
Option C: Cupola
Option D: Wall of coke oven
Correct Answer: Wall of coke oven ✔
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Option A: Quartz
Option B: Cristobalite
Option C: Tridymite
Option D: All have the same specific gravity
Correct Answer: Quartz ✔
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Option A: Increases with decrease in porosity
Option B: Decreases with decreases in porosity
Option C: Is independent of its porosity and is maximum for insulating bricks
Option D: Increases with the amount of air entrapped in pores
Correct Answer: Increases with decrease in porosity ✔
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Option A: Reduced by the addition of acid oxides
Option B: Increased by the addition of acid oxides
Option C: Not affected by the addition of acid oxides
Option D: Always less than 1000°C
Correct Answer: Reduced by the addition of acid oxides ✔
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Option A: Coke ovens regenerator
Option B: Outer lining of L.D. converter
Option C: Hearth bottom of blast furnace
Option D: Coke oven walls
Correct Answer: B. Outer lining of L.D. converter ✔
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Option A: Silica
Option B: Fireclay
Option C: High alumina refractory
Option D: Carbon black
Correct Answer: Carbon black ✔
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Option A: Magnesite
Option B: Dolomite
Option C: Fireclay
Option D: Chrome magnesite
Correct Answer: Fireclay ✔
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Option A: 700
Option B: 1000
Option C: 1600
Option D: 2000
Correct Answer: 1600 ✔
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Option A: Cupola
Option B: Gas producer
Option C: Bottom of hot metal mixer
Option D: Roof of open hearth furnace
Correct Answer: Bottom of hot metal mixer ✔
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Option A: Are not resistant to the action of basic slags
Option B: Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming
Option C: Shrink during firing
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Beehive coke ovens
Option B: By-product coke ovens
Option C: Dome of blast furnace stoves
Option D: Roof of open hearth furnace
Correct Answer: Beehive coke ovens ✔
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Option A: High insulating properties
Option B: Low heat capacity
Option C: Low thermal conductivity
Option D: Greater strength
Correct Answer: Greater strength ✔
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Option A: Fireclay
Option B: Silicon carbide
Option C: Corundum
Option D: Siliceous fireclay
Correct Answer: Silicon carbide ✔
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Option A: Beryllia
Option B: Carborundum
Option C: Corundum
Option D: Thoria
Correct Answer: Beryllia ✔
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Option A: Higher firing temperature
Option B: Higher moulding pressure
Option C: Finer grog size
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Thermal spalling
Option B: Slag attack
Option C: Fusion under load
Option D: CO attack
Correct Answer: Thermal spalling ✔
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Option A: Crushing strength
Option B: Resistance to slag attack
Option C: Both A. and B.
Option D: Neither A. nor B.
Correct Answer: Resistance to slag attack ✔
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Option A: Dead burnt magnesite ramming mass
Option B: Porous fireclay bricks
Option C: Semi-silica bricks
Option D: Silicon carbide bricks
Correct Answer: Dead burnt magnesite ramming mass ✔
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Option A: 1350
Option B: 1715
Option C: 2570
Option D: 2800
Correct Answer: 1715 ✔
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Option A: 5-10
Option B: 10-25
Option C: 25-35
Option D: 35-50
Correct Answer: 10-25 ✔
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Option A: Less load bearing capacity
Option B: Less resistance to slag attack
Option C: Low refractoriness
Option D: High resistance to thermal shock and creep
Correct Answer: High resistance to thermal shock and creep ✔
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Option A: Al2O3. 2SiO2
Option B: 3Al2O3. 2SiO2
Option C: Al2O3. SiO2
Option D: 2Al2O3. 3SiO2
Correct Answer: Al2O3. 2SiO2 ✔
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Option A: Firebrick
Option B: Sillimanite
Option C: Semi-silica
Option D: Aluminous firebrick
Correct Answer: Sillimanite ✔
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Option A: Porosity
Option B: RUL
Option C: Specific gravity
Option D: Thermal conductivity
Correct Answer: RUL ✔
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Option A: Kyanite
Option B: Sillimanite
Option C: Diaspore
Option D: Periclase
Correct Answer: Periclase ✔
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Option A: Diatomaceous earth/kieselgur
Option B: Asbestos
Option C: Vermiculite
Option D: None of these
Correct Answer: None of these ✔
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Option A: Lime
Option B: Basic
Option C: Acid
Option D: None of these
Correct Answer: Acid ✔
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Option A: Tar dolomite
Option B: Carbon
Option C: Silica
Option D: Fireclay
Correct Answer: Carbon ✔
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Option A: Strength
Option B: Thermal conductivity
Option C: Spalling resistance
Option D: None of these
Correct Answer: Spalling resistance ✔
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Option A: Silica
Option B: Fireclay
Option C: Magnesite
Option D: Zirconia
Correct Answer: Fireclay ✔
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Option A: Fireclay
Option B: Silica
Option C: Dolomite
Option D: Very low alumina
Correct Answer: Silica ✔
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Option A: Modulus of rupture
Option B: Permanent linear change
Option C: Resistance to CO attack
Option D: RUL
Correct Answer: Permanent linear change ✔
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Option A: Alumina
Option B: Thoria
Option C: Zirconia
Option D: Magnesia
Correct Answer: Thoria ✔
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Option A: Bakelite impregnated or fused periclase
Option B: Silica
Option C: Semi-silica
Option D: Fireclay
Correct Answer: Bakelite impregnated or fused periclase ✔
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Option A: Light buff to reddish buff
Option B: Yellow
Option C: Black
Option D: None of these
Correct Answer: Light buff to reddish buff ✔
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Option A: Increases with rise in service temperature
Option B: Decreases with rise in service temperature
Option C: Is unaffected with change in service temperature
Option D: Decreases with increase in porosity
Correct Answer: Decreases with rise in service temperature ✔
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Option A: Cement
Option B: Metallurgical
Option C: Fertiliser
Option D: Power
Correct Answer: Metallurgical ✔
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Option A: Thoria
Option B: Alumina
Option C: Beryllia
Option D: Zirconia
Correct Answer: Thoria ✔
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Option A: Making sheaths for thermocouple
Option B: Lining high temperature ceramic kilns
Option C: Furnaces subjected to fluctuating temperature
Option D: High frequency induction furnaces in the form of inductors
Correct Answer: Furnaces subjected to fluctuating temperature ✔
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Option A: Molten steel
Option B: Iron oxide
Option C: Lime slag
Option D: None of these
Correct Answer: Molten steel ✔
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Option A: Low co-efficient of thermal expansion
Option B: Poor thermal spalling resistance
Option C: Tendency to expand unduly high during firing
Option D: Very high cost
Correct Answer: Low co-efficient of thermal expansion ✔
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Option A: Resistance to slag penetration
Option B: Resistance to CO attack
Option C: RUL
Option D: Permanent linear change
Correct Answer: Resistance to slag penetration ✔
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Option A: 1520
Option B: 1630
Option C: 1670
Option D: 1730
Correct Answer: 1730 ✔
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Option A: Segar cones
Option B: Muffles for muffle furnaces
Option C: Insulating bricks
Option D: Crucibles used for melting of high purity metals
Correct Answer: Crucibles used for melting of high purity metals ✔
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Option A: High duty fireclay
Option B: Silica
Option C: Mullite
Option D: Carborundum
Correct Answer: High duty fireclay ✔
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Option A: Increases
Option B: Decreases
Option C: Remain constant
Option D: May increase or decrease; depends on its alumina content
Correct Answer: Increases ✔
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Option A: Silica bricks
Option B: Low duty firebricks
Option C: High alumina bricks
Option D: Graphite blocks
Correct Answer: High alumina bricks ✔
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Option A: Acidic refractory
Option B: Neutral refractory
Option C: Basic refractory
Option D: Fired at a temperature of 600°C only
Correct Answer: Neutral refractory ✔
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Option A: Has high fusion temperature (> 3000°C) but poor resistance to thermal shock
Option B: Has high resistance to basic slags
Option C: Which is expensive & radioactive, is used in crucibles for melting high purity metals
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Shape
Option B: Composition
Option C: Firing temperature
Option D: Texture
Correct Answer: Shape ✔
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Option A: Cristobalite
Option B: Tridymite
Option C: Quartz
Option D: None of these
Correct Answer: Cristobalite ✔
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Option A: 1150
Option B: 1300
Option C: 1450
Option D: 1550
Correct Answer: 1550 ✔
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Option A: Non-wetting characteristic
Option B: High thermal conductivity
Option C: High crushing strength
Option D: None of these
Correct Answer: Non-wetting characteristic ✔
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Option A: Carbides
Option B: Oxides
Option C: Borides
Option D: Nitrides
Correct Answer: Oxides ✔
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Option A: Have better spalling resistance than chrome magnesite refractories
Option B: Have very low thermal co-efficient of expansion
Option C: Are not at all resistant to the corrosive action of iron oxide
Option D: Have very low (50 kg/cm2) cold crushing strength (C.C.S.), and cannot be used in metalcase
Correct Answer: Have better spalling resistance than chrome magnesite refractories ✔
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Option A: Strength
Option B: Abrasion resistance
Option C: Both A. & B.
Option D: Neither A. nor B.
Correct Answer: C. Both A. & B. ✔
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Option A: Less shrinkage in heating, decreased apparent porosity & increased specific gravity
Option B: High strength & thermal spalling resistance
Option C: Less addition of water to get a workable plasticity & lesser time required for drying the raw
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Spalling resistance
Option B: Fusion point
Option C: Resistance to slag penetration
Option D: Resistance to carbon monoxide attack
Correct Answer: Fusion point ✔
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Option A: Obtaining monolithic working faces
Option B: Repairing construction of various furnace parts
Option C: Both A. & B.
Option D: Neither A. nor B.
Correct Answer: C. Both A. & B. ✔
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Option A: Oxidising
Option B: Neutral
Option C: Either A. or B.
Option D: Neither A. nor B.
Correct Answer: C. Either A. or B. ✔
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Option A: Spalling resistance
Option B: Refractoriness
Option C: Crushing strength
Option D: Resistance to slag
Correct Answer: Spalling resistance ✔
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Option A: Tar bonded dolomite bricks
Option B: Fireclay bricks
Option C: Magnesite bricks
Option D: Chromite bricks
Correct Answer: Fireclay bricks ✔
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Option A: Mullite
Option B: Corundum
Option C: Bauxite
Option D: Dolomite
Correct Answer: Dolomite ✔
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Option A: Porosity
Option B: Specific gravity
Option C: Thermal conductivity
Option D: Strength
Correct Answer: Porosity ✔
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Option A: Mainly contains quartz
Option B: Is not stable at high temperature
Option C: Transforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is __________ °C?
Option A: 500
Option B: 1000
Option C: >1350
Option D: >2000
Correct Answer: >1350 ✔
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Option A: Do not burn/oxidise, when exposed to air on heating
Option B: Are not attacked by slags, as they are not wetted by melts
Option C: Do not resist temperature fluctuations
Option D: Have extremely low thermal & electrical conductivities
Correct Answer: Are not attacked by slags, as they are not wetted by melts ✔
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Option A: Basic
Option B: Neutral
Option C: High alumina
Option D: Insulating
Correct Answer: High alumina ✔
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Option A: High thermal conductivity
Option B: Low porosity
Option C: Both A. and B.
Option D: Neither A. nor B.
Correct Answer: D. Neither A. nor B. ✔
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Option A: Silica
Option B: Periclase
Option C: Lime
Option D: None of these
Correct Answer: Silica ✔
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Refractoriness under load (RUL) is the most important property for the refractory bricks__________?
Option A: At the hearth bottom of the furnace on which stock is placed
Option B: Used for furnace insulation
Option C: Used in the roof of the furnace
Option D: None of these
Correct Answer: At the hearth bottom of the furnace on which stock is placed ✔
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Option A: Firebricks
Option B: Silica bricks
Option C: Silicon carbide bricks
Option D: Sillimanite
Correct Answer: Silica bricks ✔
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Option A: Soaking pit
Option B: Blast furnace
Option C: L.D. converter
Option D: Coke ovens
Correct Answer: C. L.D. converter ✔
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Option A: Are stored under controlled temperature & humidity to avoid hydration
Option B: Are used in outer lining of L.D. converters
Option C: Have poorer hydration resistance than pitch bonded bricks
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Decreased viscosity of slag
Option B: Increased thermal conductivity of brick
Option C: Oxidising condition in the furnace
Option D: None of these
Correct Answer: Decreased viscosity of slag ✔
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Option A: Pottery furnace
Option B: Glass melting furnace
Option C: Crucibles
Option D: Gas retorts
Correct Answer: Gas retorts ✔
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Option A: 50-100
Option B: 100-150
Option C: 200-400
Option D: 500-1000
Correct Answer: 200-400 ✔
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Option A: Basic Bessemer converter
Option B: Basic open hearth furnace
Option C: Electric furnaces
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Fireclay
Option B: Silica
Option C: Chrome magnesite
Option D: None of these
Correct Answer: Chrome magnesite ✔
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Option A: Attack by basic slag
Option B: Abrasion
Option C: Disintegration on sudden change of temperature
Option D: Both B. and C.
Correct Answer: D. Both B. and C. ✔
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Option A: Very high thermal conductivity
Option B: High co-efficient of expansion upto this temperature
Option C: High thermal diffusivity
Option D: Low refractoriness
Correct Answer: High co-efficient of expansion upto this temperature ✔
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Option A: CaO
Option B: MgO
Option C: Al2O3
Option D: SiO2
Correct Answer: MgO ✔
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Option A: Very high temperatures are involved
Option B: Highly reducing conditions are involved
Option C: Presence of iron or silica is harmful
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Mortars
Option B: Cements
Option C: Castables
Option D: None of these
Correct Answer: Castables ✔
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Option A: Composite material containing both ceramic & metallic constituents
Option B: Having high strength & resistance to high temperature
Option C: Used in space vehicles, missiles & nuclear energy plants
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: Greater diffusivity
Option B: Low specific heat
Option C: Low thermal co-efficient of expansion
Option D: All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
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Option A: High spalling resistance
Option B: Low spalling resistance
Option C: High resistance to fusion
Option D: Low porosity
Correct Answer: High resistance to fusion ✔
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Option A: Increasing its porosity
Option B: Using a coarser grog during its manufacture
Option C: Decreasing its thermal co-efficient of expansion
Option D: Making it denser
Correct Answer: Making it denser ✔
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Option A: High refractoriness
Option B: High resistance to spalling
Option C: High strength and density
Option D: All A., B. and C.
Correct Answer: High refractoriness ✔
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