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Refractory Technology

Refractory Technology
Which brick undergoes maximum shrinkage on drying?

Tar bonded dolomite bricks
Chromite bricks
Fireclay bricks
Magnesite bricks

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Refractory Technology
Maximum apparent porosity of magnesite bricks is about __________ percent.

58
24
44
8

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Refractory Technology
Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

Thoria
Carborundum
Beryllia
Corundum

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Refractory Technology
Electrical resistor bars are made of

Alumina
Silicon carbide
Graphite
Zirconia

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Refractory Technology
Which of the following is not a neutral refractory?

Chromite
Magnesite
Graphite
Silicon carbide

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Refractory Technology
Grog addition in fireclay during brick manufacture is done to

All of these
Enhance the strength of fired refractories
Impart greater spalling resistance
Reduce its shrinkage on heating

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