Refractory Technology MCQ Questions & Answers

41

Which furnace consumes maximum refractory annually in an integrated steel plant?

A) Soaking pit B) Blastfurnace C) L.D. converter D) Coke ovens

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Answer & Solution

Answer: Option C

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42

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.

A) 1800 B) 2200 C) 2400 D) 2700

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Answer & Solution

Answer: Option D

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43

Fireclay bricks are used in the

A) Furnaces allowed to cool frequently B) Flues C) Chimney linings D) All of the above

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Answer & Solution

Answer: Option D

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44

Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, becaus of its

A) Non-wetting characteristic B) High thermal conductivity C) High crushing strength D) None of these

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Answer & Solution

Answer: Option A

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45

'Spinel', a refractory mineral is chemically represented as

A) M_gAl₂O₄ B) M_gAl₂O₃ C) M_gSO₄ D) M_gAl₂O₃.2H₂O

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Answer & Solution

Answer: Option A

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46

Pick out the wrong statement.

A) Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks B) Graphite refractories are also called plumbago refractories C) Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28 D) Calcined magnesite is also called dead burnt magnesite

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Answer & Solution

Answer: Option C

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47

Fireclay bricks are not used in the

A) Beehive coke oven B) By-product coke oven walls C) Combustion chamber of B.F. stoves D) Coke oven regenerators

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Answer & Solution

Answer: Option B

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48

Spalling of a refractory means its

A) Softening B) Fracture due to uneven expansion at high temperature C) Resistancce to compressive loads D) Resistance to chemical action of gases and molten fluxes

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Answer & Solution

Answer: Option B

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49

Magnesite chrome refractories

A) Have better spalling resistance than chrome magnesite refractories B) Have very low thermal co-efficient of expansion C) Are not at all resistant to the corrosive action of iron oxide D) Have very low (50 kg/cm²) cold crushing strength (C.C.S.) and can not be used in metalcase form

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Answer & Solution

Answer: Option A

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50

Refractory bricks with lower permeability is produced by using

A) Higher firing temperature B) Higher moulding pressure C) Finer grog size D) All of the above

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Answer & Solution

Answer: Option D

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Refractory Technology MCQ Questions & Answers | Chemical Engineering