Chemical Engineering - Refractory Technology

41. 

With increase in the alumina content, the refractoriness of high alumina refractories

A. increases
B. decreases
C. remains same
D. may increase or decrease

Answer: Option A

Explanation:

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42. 

A steel member used in the furnace construction to take the thrust of the brickwork is called

A. buckstay
B. breast wall
C. armouring
D. baffle

Answer: Option A

Explanation:

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43. 

With increase in the porosity, thermal spalling resistance of fireclay brick

A. increases
B. decreases
C. remains same
D. may increase or decrease

Answer: Option A

Explanation:

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44. 

Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

A. segar cones.
B. muffles for muffle furnaces.
C. insulating bricks.
D. crucibles used for melting of high purity metals.

Answer: Option D

Explanation:

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45. 

Maximum alumina content in high alumina refractory can be as high as __________ percent.

A. 30
B. 50
C. 70
D. 90

Answer: Option D

Explanation:

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