REFRACTORY TECHNOLOGY QUIZ

Grog addition in fireclay during brick manufacture is done to

Impart greater spalling resistance

Enhance the strength of fired refractories

Reduce its shrinkage on heating

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Sillimanite is a __________ refractory.

Basic

Insulating

Neutral

High alumina

TRUE ANSWER : ?
YOUR ANSWER : ?

Carborundum used for making crucibles for melting non-ferrous metals is chemically

Crystalline magnesia

Zirconium sulphate

Silicon nitride

Silicon carbide

TRUE ANSWER : ?
YOUR ANSWER : ?

Ramming masses are used for

Obtaining monolithic working faces

Repairing construction of various furnace parts

Neither A nor B

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

Si percentage in silica refractories used in the walls of coke oven is about

60

80

95

45

TRUE ANSWER : ?
YOUR ANSWER : ?

Refractoriness/fusion points of 'superduty' refractories is __________ °C.

> 1730

> 2000

1630-1670

1520-1630

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnesite refractories are generally not used in the

Open hearth furnace

Burning zone of cement kilns

Steel melting furnace

Electric furnace walls

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnesite bricks are used in those parts of furnaces, which are

None of these

Required to resist corrosive basic slag

Subjected to temperature fluctuation

Subjected to high load

TRUE ANSWER : ?
YOUR ANSWER : ?

Chrome magnesite brick is not used for lining the

Burning zone of limestone rotary kilns

Coke oven regenerator

Bottom hearth of reheating furnace

Hearth of soaking pits

TRUE ANSWER : ?
YOUR ANSWER : ?

Roof of a basic open hearth furnace is lined with __________ bricks.

Fireclay

Magnesite

Silica

Dolomite

TRUE ANSWER : ?
YOUR ANSWER : ?

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