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Chemical Engineering - Refractory Technology

Exercise : Refractory Technology - Section 2
26.
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
fireclay
carborundum
graphite
chromite
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
Tar bonded dolomite bricks
Fireclay bricks
Mullite bricks
Magnesite bricks
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
Alumina-graphite bricks are used for lining the
slide gate in teeming laddies.
continuous casting systems.
both (a) and (b).
neither (a) nor (b).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Spalling resistance of a refractory can not be increased by
increasing its porosity.
using a coarser grog during its manufacture.
decreasing its thermal co-efficient of expansion.
making it denser.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Fireclay refractories have
low co-efficient of thermal expansion.
poor thermal spalling resistance.
tendency to expand unduly high during firing.
very high cost.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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