A. Resistance to carbon monoxide attack

B. Resistance to slag penetration

D. Spalling resistance

A. Decreases

B. May increase or decrease; depends on its alumina content

D. Remain constant

A. Attack by basic slag

B. Abrasion

C. Disintegration on sudden change of temperature

A. 0

B. <1

D. >1

A. Side wall of soaking pits

B. Regenerators of coke oven

D. Walls of coke oven

A. Chromite

B. Fireclay

C. Carborundum

B. Fireclay

C. Silica

D. None of these

A. Refractoriness (< 1700C)

B. Thermal conductivity

C. Resistance to thermal shock

A. > 94

C. 80-85

D. 35-40

B. Used for furnace insulation

C. Used in the roof of the furnace

D. None of these

A. Zirconia

B. Graphite

D. Alumina

A. CaO

B. SiO2

C. Al2O3

A. Extrusion

B. pressing/machine moulding

C. Hand moulding

B. Fireclay bricks

C. High alumina bricks

D. Tar dolomite bricks

A. Highly chemical resistant equipments

C. Blast furnace hearth

D. Electric furnaces

A. Oxidising

C. Neutral

D. Neither A. nor B.

A. Is unaffected with change in service temperature

B. Increases with rise in service temperature

D. Decreases with increase in porosity

A. High thermal conductivity

B. None of these

C. High crushing strength

A. duct

B. Develop stable mineral forms in them

D. Dehydrate the dried refractory

E. Form ceramic bonds necessary for development of high crushing strength in the finished

A. Copper melting furnaces & converters

B. Burner block of glass tanks

D. Side walls of soaking pits and arc furnaces

A. Reheating furnace

B. Soaking pits

C. Rotary lime kiln

A. >2000

C. 500

D. 1000

B. 10

C. 500

D. 100

A. Fusion point

B. Refractoriness under load (RUL)

C. Slag penetration resistance

A. Has high resistance to basic slags

C. Which is expensive & radioactive, is used in crucibles for melting high purity metals

D. Has high fusion temperature (> 3000C) but poor resistance to thermal shock

B. Neutral in nature

C. Made by mixing 30% Chromite and 70% Periclase

D. Acidic in nature

A. Resistance to CO attack

B. Permanent linear change

C. RUL

A. Magnesite bricks

C. Chromite bricks

D. Tar bonded dolomite bricks

B. Slag penetration resistance

C. Fusion point

D. Thermal conductivity

A. Subjected to temperature fluctuation

C. None of these

D. Subjected to high load

A. None of these

B. Sun

C. Rotary kilns

A. Volume

C. Both A. & B.

D. Neither A. nor B.

A. Oxidising atmosphere

C. Reducing atmosphere

D. Neutral atmosphere

A. Softening

C. Resistance to compressive loads

D. Resistance to chemical action of gases and molten fluxes

A. 5 to 10

C. 60 to 75

D. 45 to 60

A. Poor thermal spalling resistance

B. Very high cost

C. Tendency to expand unduly high during firing

A. Lime

C. Periclase

D. None of these

B. > 2000

C. 1630-1670

D. 1520-1630

A. Cristobalite

B. None of these

C. Tridymite

A. Are bonded with lime and clay

C. (Free from silica) have better thermal fatigue resistance than silica and magnesite refractories.

D. Are resistant to basic slag

B. Decreases

C. Remain same

D. May increase or decrease

A. Open hearth furnace

B. Burning zone of cement kilns

D. Electric furnace walls

A. Basic

B. Neutral

C. Insulating

A. Dolomite

C. Magnesite

D. Fireclay

A. None of these

B. Mortars

D. Cements

A. Resistance to slag attack increases

B. Spalling resistance reduces

D. Neither A. nor B.

A. Soaking pit

B. Blast furnace

C. Coke ovens

B. Dome and upper portion of B.F. stoves

C. Open hearth furnace roof

D. Coke oven walls

A. 1800

C. 2200

D. 2400

B. All A., B. and C.

C. Have lower thermal conductivity than fireclay bricks

D. Cannot be used in the dome of hot blast stoves