BUILDING MATERIALS QUIZ

Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory

Castables

None of these

Cements

Mortars

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YOUR ANSWER : ?

Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?

Sillimanite

Silica bricks

Firebricks

Silicon carbide bricks

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The maximum linear expansion of silica bricks during firing is about __________ percent.

3.5

1

0.5

2

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Fireclay refractories

Are not resistant to the action of basic slags

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

Shrink during firing

All of these

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The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.

Fireclay

Corundum

Silica

Magnesite

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Silicon carbide refractories are used in the

Zinc smelting furnace

Ceramic recuperators

All of these

Muffle furnace

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Which of the following has the lowest electrical resistivity?

Zircon

Alumina

Fireclay

Graphite

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Fusion temperature of pure silica (SiO₂) is __________ °C.

2800

1350

2570

1715

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Silica refractories are not used in

Dome and upper portion of B.F. stoves

Coke oven walls

Open hearth furnace roof

Beehive coke ovens

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Magnesite refractories are used for the construction of those furnaces, which are

Both (b) and ©

Not required to resist the corrosive action of basic slag

Not subjected to fluctuation in temperature

Used for raising & maintaining high temperature

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