Refractory Technology MCQ Questions & Answers

1

Silica bricks have low spalling resistance below 600°C, due to its

A) Very high thermal conductivity B) High co-efficient of expansion upto this temperature C) High thermal diffusivity D) Low refractoriness

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Answer & Solution

Answer: Option B

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2

With increasing alumina content, the fusion point of high alumina refractories

A) Increases B) Decreases C) Remains constant D) May increase or decrease ; depends on its alumina content

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Answer & Solution

Answer: Option A

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3

Addition of grog in fireclay brick during its manufacture is advantageous, because it results in

A) Less shrinkage in heating, decreased apparent porosity & increased specific gravity B) High strength & thermal spalling resistance C) Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production D) All of the above

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Answer & Solution

Answer: Option D

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4

Tar bonded dolomite bricks

A) Are stored under controlled temperature & humidity to avoid hydration B) Are used in outer lining of L.D. converters C) Have poorer hydration resistance than pitch bonded bricks D) All of the above

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Answer & Solution

Answer: Option D

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5

Sillimanite is a __________ refractory.

A) Basic B) Neutral C) High alumina D) Insulating

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Answer & Solution

Answer: Option C

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6

Which form of silica has the highest specific gravity?

A) Quartz B) Cristobalite C) Tridymite D) All of the above

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Answer & Solution

Answer: Option A

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7

What is Thoria?

A) Thoria Has high fusion temperature (> 3000°C) but poor resistance to thermal shock B) Thoria Has high resistance to basic slags C) Which is expensive & radioactive, is used in crucibles for melting high purity metals D) All of the above

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Answer & Solution

Answer: Option D

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8

Resistance to slag attack of a refractory

A) Depends on the nature of slag & refractory B) Decreases at higher temperature C) Decreases, if defective joints & cracks exist in the refractory D) All of the above

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Answer & Solution

Answer: Option D

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9

Which of the following impurities reduces the refractoriness of magnesite bricks?

A) Al₂O₃ B) CaO C) SiO₂ D) All of the above

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Answer & Solution

Answer: Option D

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10

With increase in the density of silica refractories, its

A) Resistance to slag attack increases B) Spalling resistance reduces C) Both A & B D) Neither A nor B

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Answer & Solution

Answer: Option C

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Refractory Technology MCQ Questions & Answers | Chemical Engineering