Chemical Engineering - Refractory Technology

41. 

Addition of zircon to silica refractory brick improves its

A. crushing strength
B. resistance to slag attack
C. both (a) and (b)
D. neither (a) nor (b)

Answer: Option B

Explanation:

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42. 

Which is a neutral refractory ?

A. Graphite
B. Magnesite chrome
C. Silica
D. Magnesia

Answer: Option A

Explanation:

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43. 

Permeability of bricks is a measure of the

A. refractoriness.
B. melting point.
C. rate at which a fluid will pass through the pores.
D. expansion during heating.

Answer: Option C

Explanation:

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44. 

With increase in the density of silica refractories, its

A. resistance to slag attack increases.
B. spalling resistance reduces.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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45. 

Magnesite chrome refractories

A. have better spalling resistance than chrome magnesite refractories.
B. have very low thermal co-efficient of expansion.
C. are not at all resistant to the corrosive action of iron oxide.
D. have very low (50 kg/cm2 ) cold crushing strength (C.C.S.), and can not be used in metalcase form.

Answer: Option A

Explanation:

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