DATA TYPES AND VARIABLES QUIZ

Cold crushing strength of a refractory does not depend upon its

Firing temperature

Shape

Texture

Composition

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnesite chrome bricks are used in the

Soaking pits

Reheating furnaces

Roof lining of basic open hearth & other basic furnaces

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Porosity of fireclay refractories is __________ percent.

43961

44129

35-50

25-35

TRUE ANSWER : ?
YOUR ANSWER : ?

SiO₂ percentage in firebrick is about

>94

55-60

80-85

35-40

TRUE ANSWER : ?
YOUR ANSWER : ?

Which is the stable form of silica upto 1470°C ?

None of these

Tridymite

Cristobalite

Quartz

TRUE ANSWER : ?
YOUR ANSWER : ?

__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

High thermal conductivity

Non-wetting characteristics

Low porosity

High density

TRUE ANSWER : ?
YOUR ANSWER : ?

Permeability of bricks is a measure of the

Refractoriness

Rate at which a fluid will pass through the pores

Melting point

Expansion during heating

TRUE ANSWER : ?
YOUR ANSWER : ?

Hollow refractory bricks are made by

Extrusion

Hand moulding

Pressing/machine moulding

Slip casting

TRUE ANSWER : ?
YOUR ANSWER : ?

Thermal diffusivity of a refractory brick is high, when its __________ is high.

None of these

Thermal conductivity

Specific heat

Density

TRUE ANSWER : ?
YOUR ANSWER : ?

Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except

Electrical conductivity

Fusion point

Cost

Thermal conductivity

TRUE ANSWER : ?
YOUR ANSWER : ?

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