Chemical Engineering - Refractory Technology

46. 

High density refractory bricks have lower

A. spalling resistance.
B. thermal conductivity.
C. fusion point.
D. slag penetration resistance.

Answer: Option A

Explanation:

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47. 

Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in

A. pottery furnace
B. glass melting furnace
C. crucibles
D. gas retorts

Answer: Option D

Explanation:

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48. 

Zircon refractories have

A. low co-efficient of expansion.
B. high RUL (1600°C) and refractoriness (> 2000°C).
C. high spalling resistance.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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49. 

Cermets are

A. composite material containing both ceramic & metallic constituents.
B. having high strength & resistance to high temperature.
C. used in space vehicles, missiles & nuclear energy plants.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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50. 

Carbon refractory blocks

A. are wetted by molten iron.
B. are used in the hearth of blast furnace.
C. are acidic in nature.
D. all (a), (b) and (c).

Answer: Option B

Explanation:

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