Chemical Engineering - Refractory Technology

46. 

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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47. 

Refractories are dried in the

A. rotary kilns
B. tunnel kilns
C. sun
D. none of these

Answer: Option B

Explanation:

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48. 

Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the

A. hearth of the blast furnace.
B. nuclear reactors, missiles & space crafts.
C. insulation of high temperature furnaces.
D. roof of electric furnaces.

Answer: Option B

Explanation:

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49. 

Hot metal runner in blast furnace are lined with __________ bricks.

A. silica
B. carborundum
C. fireclay
D. magnesite

Answer: Option C

Explanation:

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50. 

Spray test determines the __________ of refractories.

A. resistance to slag penetration
B. resistance to CO attack
C. RUL
D. permanent linear change

Answer: Option A

Explanation:

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