REFRACTORY TECHNOLOGY QUIZ

__________ bricks are used in the burning zone of a cement rotary kiln.

Thoria

Silicon carbide

Fireclay

High alumina

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one expands on heating?

Silica bricks

Neither A nor B

Fireclay bricks

Both A & B

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The main raw material for manufacture of silicon carbide refractories is

Bauxite

Corrundum

Carborundum

Periclase

TRUE ANSWER : ?
YOUR ANSWER : ?

Fireclay refractories

Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc

Are not resistant to the action of basic slags

All of these

Shrink during firing

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is a basic refractory?

None of these

Silica

Chrome magnesite

Fireclay

TRUE ANSWER : ?
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Cermets are

All of these

Composite material containing both ceramic & metallic constituents

Used in space vehicles, missiles & nuclear energy plants

Having high strength & resistance to high temperature

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Fireclay bricks are never used in the

Beehive oven

Zinc roaster

Coke oven walls

Lead blast furnace

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Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ °C.

500

1000

>1350

>2000

TRUE ANSWER : ?
YOUR ANSWER : ?

Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.

Zirconia

Magnesite

Silica

Fireclay

TRUE ANSWER : ?
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10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.

Refractoriness

Spalling resistance

Resistance to slag

Crushing strength

TRUE ANSWER : ?
YOUR ANSWER : ?