Online Chemical Engineering Test - Refractory Technology Test

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Total number of questions: 20.
Time allotted: 30 minutes.
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An indication of degree of firing in silica brick is its

specific gravity

fusion point

RUL

none of these

[#]

Fireclay bricks are used in the

coke ovens regenerator.

outer lining of L.D. converter.

hearth bottom of blast furnace.

coke oven walls.

[#]

Outer combustion chamber of blast furnace stove is lined with __________ bricks.

fireclay

silica

chrome magnesite

zirconia

[#]

Vacuum steel degassing units are lined with

silica bricks

low duty firebricks

high alumina bricks

graphite blocks

[#]

Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

segar cones.

muffles for muffle furnaces.

insulating bricks.

crucibles used for melting of high purity metals.

[#]

Cermets are

composite material containing both ceramic & metallic constituents.

having high strength & resistance to high temperature.

used in space vehicles, missiles & nuclear energy plants.

all (a), (b) and (c).

[#]

Periclase refractory contains mainly

CaO

MgO

Al₂O₃

SiO₂

[#]

Cold crushing strength of a refractory does not depend upon its

shape

composition

firing temperature

texture

[#]

Silliminite (Al₂O₃.SiO₂) refractory, which is a neutral refractory, is not used in

pottery furnace

glass melting furnace

crucibles

gas retorts

[#]

10.

Ferromagnetic ceramic material is not used in the

thermal insulation

transformers

magnetic switches

television sets

[#]

11.

Fusion temperature of pure silica (SiO₂) is __________ °C.

1350

1715

2570

2800

[#]

12.

Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to

thermal spalling

slag attack

fusion under load

CO attack

[#]

13.

Which is a neutral refractory ?

Graphite

Magnesite chrome

Silica

Magnesia

[#]

14.

Fireclay refractories

are not resistant to the action of basic slags.

combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc.

shrink during firing

all (a), (b) and (c)

[#]

15.

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.

[#]

16.

Mixing of ground refractory material and water is done in a __________ mill.

pug

ball

tube

rod

[#]

17.

Colour of fireclay bricks is

light buff to reddish buff

yellow

black

none of these

[#]

18.

Refractory castables are used for

producing monolithic linings.

patch work.

minimising the number of joints in the structure.

all (a), (b) and (c).

[#]

19.

Chrome magnesite bricks are

acidic in nature.

neutral in nature.

having higher RUL than silica bricks.

made by mixing 30% chromite and 70% periclase.

[#]

20.

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.

1800

2200

2400

2700

[#]

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Online Chemical Engineering Test - Refractory Technology Test

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