REFRACTORY TECHNOLOGY QUIZ

Carbon bricks are not used in the lining of the

Highly chemical resistant equipments

Blast furnace hearth

Electric furnaces

Combustion chamber of blast furnace stoves

TRUE ANSWER : ?
YOUR ANSWER : ?

Hot face insulating linings of high purity alumina fused mullite are used, where

Highly reducing conditions are involved

Very high temperatures are involved

Presence of iron or silica is harmful

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Conversion of silica mineral to cristobalite is accompanied by reduction in its

Specific gravity

Neither A nor B

Volume

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.

1520

1730

1630

1670

TRUE ANSWER : ?
YOUR ANSWER : ?

Which furnace consumes maximum refractory annually in an integrated steel plant?

Coke ovens

L.D. converter

Soaking pit

Blastfurnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Silica refractories

Can not be used in the dome of hot blast stoves

Crack when subjected to sudden change of temperature

Have lower thermal conductivity than fireclay bricks

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

2000

1000

1600

700

TRUE ANSWER : ?
YOUR ANSWER : ?

Graphite or carbon refractories

Exihibit wetting characteristics

Are not resistant to corrosion by slag

Should be used in neutral or reducing atmosphere

Exhibit high shrinkage on thermal treatment

TRUE ANSWER : ?
YOUR ANSWER : ?

Chromite refractories are used in

Bottom of soaking pits

Between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other

Neither A nor B

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one contains minimum percentage of SiO₂?

Firebrick

Aluminous firebrick

Semi-silica

Sillimanite

TRUE ANSWER : ?
YOUR ANSWER : ?