Chemical Engineering - Refractory Technology

36. 

Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.

A. high duty fireclay
B. silica
C. mullite
D. carborundum

Answer: Option A

Explanation:

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37. 

Fireclay bricks are used in the

A. coke ovens regenerator.
B. outer lining of L.D. converter.
C. hearth bottom of blast furnace.
D. coke oven walls.

Answer: Option A

Explanation:

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38. 

Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.

A. 5
B. 20
C. 40
D. 55

Answer: Option B

Explanation:

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39. 

Chromite refractories

A. are bonded with lime and clay.
B. (free from silica) have better thermal fatigue resistance than silica and magnesite refractories.
C. are resistant to basic slag.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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40. 

Firing temperature is minimum (1250-1400 °C) for __________ bricks.

A. fireclay
B. direct bonded basic
C. silica
D. magnesite

Answer: Option A

Explanation:

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