REFRACTORY TECHNOLOGY QUIZ

Is unaffected with change in service temperature

Decreases with rise in service temperature

Increases with rise in service temperature

Decreases with increase in porosity

Reduced by the addition of basic oxides

Not affected by the addition of basic oxides

Increased by the addition of basic oxides

Not affected by the addition of basic oxides

Fireclay

Magnesite

Chromite

Foresterite

Chromite bricks

Fireclay bricks

Magnesite bricks

Tar bonded dolomite bricks

Silica

Very low alumina

Fireclay

Dolomite

RUL

Resistance to slag penetration

Permanent linear change

Resistance to CO attack

Softening

Resistance to chemical action of gases and molten fluxes

Fracture due to uneven expansion at high temperature

Resistancce to compressive loads

At the hearth bottom of the furnace on which stock is placed

None of these

Used for furnace insulation

Used in the roof of the furnace

Low heat capacity

Greater strength

Low thermal conductivity

High insulating properties

Making it denser

Using a coarser grog during its manufacture

Increasing its porosity

Decreasing its thermal co-efficient of expansion