Chemical Engineering - Refractory Technology

46. 

To resist spalling tendency, a refractory should have

A. greater diffusivity.
B. low specific heat.
C. low thermal co-efficient of expansion.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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47. 

Cold crushing strength of fireclay bricks is about __________ kgf/cm2.

A. 50-100
B. 100-150
C. 200-400
D. 500-1000

Answer: Option C

Explanation:

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48. 

Spalling tendency of refractories is reduced by increasing its

A. porosity
B. specific gravity
C. thermal conductivity
D. strength

Answer: Option A

Explanation:

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49. 

Carbon refractories are exclusively used in the

A. hearth of blast furnace.
B. walls of coke oven.
C. regenerators of coke oven.
D. side wall of soaking pits.

Answer: Option A

Explanation:

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50. 

Spalling of a refractory means its

A. softening.
B. fracture due to uneven expansion at high temperature.
C. resistancce to compressive loads.
D. resistance to chemical action of gases and molten fluxes.

Answer: Option B

Explanation:

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