Chemical Engineering - Refractory Technology

36. 

Which of the following bricks should not be used, if the furnace is to be used intermit-tantly ?

A. Firebricks
B. Silica bricks
C. Silicon carbide bricks
D. Sillimanite

Answer: Option B

Explanation:

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37. 

Refractory castables are used for

A. producing monolithic linings.
B. patch work.
C. minimising the number of joints in the structure.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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38. 

The largest consumer of refractories is the __________ industry.

A. cement
B. metallurgical
C. fertiliser
D. power

Answer: Option B

Explanation:

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39. 

Graphite or carbon refractories

A. exihibit wetting characteristics.
B. should be used in neutral or reducing atmosphere.
C. exhibit high shrinkage on thermal treatment.
D. are not resistant to corrosion by slag.

Answer: Option B

Explanation:

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40. 

'Spinel', a refractory mineral is chemically represented as

A. MgAl2O4
B. MgAl2O3
C. MgSO4
D. MgAl2O3.2H2O

Answer: Option A

Explanation:

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