Chemical Engineering - Refractory Technology

26. 

Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).

A. fireclay
B. carborundum
C. graphite
D. chromite

Answer: Option C

Explanation:

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27. 

Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?

A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Mullite bricks
D. Magnesite bricks

Answer: Option A

Explanation:

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28. 

Alumina-graphite bricks are used for lining the

A. slide gate in teeming laddies.
B. continuous casting systems.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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29. 

Spalling resistance of a refractory can not be increased by

A. increasing its porosity.
B. using a coarser grog during its manufacture.
C. decreasing its thermal co-efficient of expansion.
D. making it denser.

Answer: Option D

Explanation:

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30. 

Fireclay refractories have

A. low co-efficient of thermal expansion.
B. poor thermal spalling resistance.
C. tendency to expand unduly high during firing.
D. very high cost.

Answer: Option A

Explanation:

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