Chemical Engineering - Refractory Technology

6. 

Semi-silica bricks compared to silica bricks have

A. less fusion point.
B. better spalling resistance.
C. both (a) and (b).
D. neither (a) not (b).

Answer: Option C

Explanation:

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7. 

Mixing of ground refractory material and water is done in a __________ mill.

A. pug
B. ball
C. tube
D. rod

Answer: Option A

Explanation:

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8. 

Maximum apparent porosity of magnesite bricks is about __________ percent.

A. 8
B. 24
C. 44
D. 58

Answer: Option B

Explanation:

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9. 

Dilatometer is used for the determination of __________ of refractories.

A. modulus of rupture
B. permanent linear change
C. resistance to CO attack
D. RUL

Answer: Option B

Explanation:

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10. 

With decrease in porosity, the __________ of the refractories decreases.

A. strength
B. thermal conductivity
C. spalling resistance
D. none of these

Answer: Option C

Explanation:

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