Refractory Technology - Chemical Engineering Questions and Answers

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Which of the following is not a neutral refractory ?

Silicon carbide

Magnesite

Chromite

Graphite

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Which is a basic refractory ?

Fireclay

Silica

Chrome magnesite

None of these

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Cold crushing strength of a refractory does not depend upon its

shape

composition

firing temperature

texture

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

at the hearth bottom of the furnace on which stock is placed.

used for furnace insulation.

used in the roof of the furnace.

none of these.

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Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?

Soaking pits

Ceheating furnace

L.D. converter

Rotary lime kiln

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__________ nozzles are used in continuous casting of steel,

Zircon

Thoria

Carborundum

Beryllia

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silicon carbide refractories have very low

refractoriness (< 1700°C).

thermal conductivity.

resistance to thermal shock.

none of these.

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Basic bricks are not made of

fireclay

magnesite

foresterite

chromite

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With increase in the alumina content in firebricks, its fusion point (refractoriness)

decreases linearly

remains unchanged

increases

decreases