REFRACTORY TECHNOLOGY QUIZ

Chrome magnesite is not used in the

Wear out lining of steel melting furnaces

Aluminium melting furnaces

All of these

Inner lining of L.D. converter

TRUE ANSWER : ?
YOUR ANSWER : ?

Pyrometric cone equivalent (PCE) of a refractory is the measure of its

Fusion point

Resistance to slag penetration

Resistance to carbon monoxide attack

Spalling resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

Spalling of a refractory means its

Resistancce to compressive loads

Fracture due to uneven expansion at high temperature

Resistance to chemical action of gases and molten fluxes

Softening

TRUE ANSWER : ?
YOUR ANSWER : ?

Permeability of bricks is a measure of the

Expansion during heating

Melting point

Rate at which a fluid will pass through the pores

Refractoriness

TRUE ANSWER : ?
YOUR ANSWER : ?

Mullite is chemically represented by

Al2O₃ . 2SiO₂

2Al2O₃ . 3SiO₂

Al2O₃ . SiO₂

3Al2O₃ . 2SiO₂

TRUE ANSWER : ?
YOUR ANSWER : ?

Silica bricks are never used for lining the

Beehive coke ovens

By-product coke ovens

Dome of blast furnace stoves

Roof of open hearth furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

'Super refractories' are made from pure

Nitrides

Borides

Oxides

Carbides

TRUE ANSWER : ?
YOUR ANSWER : ?

Which one contains minimum percentage of SiO₂?

Firebrick

Semi-silica

Sillimanite

Aluminous firebrick

TRUE ANSWER : ?
YOUR ANSWER : ?

Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?

Lime

Aluminium phosphate

Plaster of paris

Water

TRUE ANSWER : ?
YOUR ANSWER : ?

Spray test determines the __________ of refractories.

Resistance to CO attack

Permanent linear change

RUL

Resistance to slag penetration

TRUE ANSWER : ?
YOUR ANSWER : ?

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