REFRACTORY TECHNOLOGY QUIZ

Insulating refractories should have

Neither A nor B

High porosity

Both A & B

Low thermal conductivity

TRUE ANSWER : ?
YOUR ANSWER : ?

High density refractory bricks have lower

Fusion point

Spalling resistance

Slag penetration resistance

Thermal conductivity

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Very high temperatures are involved

All of these

Presence of iron or silica is harmful

Highly reducing conditions are involved

TRUE ANSWER : ?
YOUR ANSWER : ?

Mixing of ground refractory material and water is done in a __________ mill.

Pug

Tube

Ball

Rod

TRUE ANSWER : ?
YOUR ANSWER : ?

Which brick undergoes maximum shrinkage on drying?

Chromite bricks

Tar bonded dolomite bricks

Fireclay bricks

Magnesite bricks

TRUE ANSWER : ?
YOUR ANSWER : ?

Carbon refractory blocks

Are wetted by molten iron

All of these

Are acidic in nature

Are used in the hearth of blast furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is the stable form of silica upto 1470°C ?

Tridymite

Quartz

None of these

Cristobalite

TRUE ANSWER : ?
YOUR ANSWER : ?

Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

Thoria

Carborundum

Corundum

Beryllia

TRUE ANSWER : ?
YOUR ANSWER : ?

What is Thoria?

Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock

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

All of these

Thoria Has high resistance to basic slags

TRUE ANSWER : ?
YOUR ANSWER : ?

Addition of zircon to silica refractory brick improves its

Crushing strength

Resistance to slag attack

Neither A nor B

TRUE ANSWER : ?
YOUR ANSWER : ?