REFRACTORY TECHNOLOGY QUIZ

Chrome magnesite bricks are

Neutral in nature

Acidic in nature

Having higher RUL than silica bricks

Made by mixing 30% chromite and 70% periclase

TRUE ANSWER : ?
YOUR ANSWER : ?

Fusion point of an acidic refractory material is

Reduced by the addition of basic oxides

Not affected by the addition of basic oxides

Not affected by the addition of basic oxides

Increased by the addition of basic oxides

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

700

1000

1600

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is an acidic refractory?

Chrome magnesite

Dolomite

Magnesite

Fireclay

TRUE ANSWER : ?
YOUR ANSWER : ?

Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm².

500

10

1000

100

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is not a basic refractory?

Chrome magnesite

Dolomite

Magnesite

Silicon carbide

TRUE ANSWER : ?
YOUR ANSWER : ?

Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage?

Fireclay bricks

Mullite bricks

Tar bonded dolomite bricks

Magnesite bricks

TRUE ANSWER : ?
YOUR ANSWER : ?

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

Silica

Very low alumina

Fireclay

Dolomite

TRUE ANSWER : ?
YOUR ANSWER : ?

Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.

Preheating

Burning

All of these

Cooling

TRUE ANSWER : ?
YOUR ANSWER : ?

High alumina refractory compared to fireclay bricks have

Less load bearing capacity

High resistance to thermal shock and creep

Less resistance to slag attack

Low refractoriness

TRUE ANSWER : ?
YOUR ANSWER : ?

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