REFRACTORY TECHNOLOGY QUIZ

Chrome magnesite bricks are

Made by mixing 30% chromite and 70% periclase

Having higher RUL than silica bricks

Acidic in nature

Neutral in nature

TRUE ANSWER : ?
YOUR ANSWER : ?

Grog

Contains both alumina and silica

All of these

Iscrushed firebrick

Is a non-plastic material

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is a basic refractory?

Chrome magnesite

Fireclay

None of these

Silica

TRUE ANSWER : ?
YOUR ANSWER : ?

Refractoriness under load (RUL) is the most important property for the refractory bricks

None of these

At the hearth bottom of the furnace on which stock is placed

Used in the roof of the furnace

Used for furnace insulation

TRUE ANSWER : ?
YOUR ANSWER : ?

With decrease in porosity, the __________ of the refractories decreases.

None of these

Thermal conductivity

Strength

Spalling resistance

TRUE ANSWER : ?
YOUR ANSWER : ?

Chromite refractories are used in

Between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other

Neither A nor B

Bottom of soaking pits

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

'Spinel', a refractory mineral is chemically represented as

MgSO₄

MgAl2O₃

MgAl2O₄

MgAl2O₃.2H₂O

TRUE ANSWER : ?
YOUR ANSWER : ?

Lower part of hot metal mixer are lined with __________ bricks.

Superduty fireclay

Silica

High alumina

Carborundum

TRUE ANSWER : ?
YOUR ANSWER : ?

RUL of refractories depends on the

Physical structure

All of these

Presence of impurities like iron & alkali

Chemical composition

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.

20

10

30

15

TRUE ANSWER : ?
YOUR ANSWER : ?