Refractory Technology MCQ Questions & Answers

1

Highest melting (m.p = 3070°C) oxide refractory is

A) Alumina B) Thoria C) Zirconia D) Magnesia

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Answer & Solution

Answer: Option B

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2

Fusion point of an acidic refractory material is

A) Increased by the addition of basic oxides B) Reduced by the addition of basic oxides C) Not affected by the addition of basic oxides D) None of the above

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Answer & Solution

Answer: Option B

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3

Which of the following is not a high alumina refractory material?

A) Kyanite B) Sillimanite C) Diaspore D) Periclase

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Answer & Solution

Answer: Option D

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4

Magnesite refractories are generally not used in the

A) Electric furnace walls B) Steel melting furnace C) Open hearth furnace D) Burning zone of cement kilns

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Answer & Solution

Answer: Option B

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5

Silica bricks are never used for lining the

A) Beehive coke ovens B) By-product coke ovens C) Dome of blast furnace stoves D) Roof of open hearth furnace

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Answer & Solution

Answer: Option A

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6

Cold crushing strength of ordinary fireclay brick is about 950 kg/cm². On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm².

A) 450 B) 250 C) 150 D) 65

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Answer & Solution

Answer: Option D

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7

Magnesite chrome bricks are used in the

A) Roof lining of basic open hearth & other basic furnaces B) Reheating furnaces C) Soaking pits D) All of the above

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Answer & Solution

Answer: Option D

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8

Which of the following bricks has the most close values of RUL and PCE?

A) Silica bricks B) Fireclay bricks C) High alumina bricks D) Tar dolomite bricks

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Answer & Solution

Answer: Option A

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9

__________ is the measure of the strength of refractory under the combined effect of temperature & load.

A) Porosity B) RUL C) Specific gravity D) Thermal conductivity

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Answer & Solution

Answer: Option B

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10

An indication of degree of firing in silica brick is its

A) Specific gravity B) Fusion point C) RUL D) None of these

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Answer & Solution

Answer: Option A

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Refractory Technology MCQ Questions & Answers | Chemical Engineering