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Chemical Engineering Objective Questions { Refractory Technology }



22. Carbon bricks are not used in the lining of the
A. Combustion chamber of blast furnace stoves
B. Electric furnaces
C. Highly chemical resistant equipments
D. Blast furnace hearth
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23. High alumina refractory compared to fireclay bricks have
A. Less load bearing capacity
B. Less resistance to slag attack
C. Low refractoriness
D. High resistance to thermal shock and creep
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24. Which furnace consumes maximum refractory annually in an integrated steel plant?
A. Soaking pit
B. Blastfurnace
C. L.D. converter
D. Coke ovens
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25. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2.
A. 450
B. 250
C. 150
D. 65
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26. Grog addition in fireclay during brick manufacture is done to
A. Reduce its shrinkage on heating
B. Impart greater spalling resistance
C. Enhance the strength of fired refractories
D. All of the above
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27. Quartz is
A. Stable form of silica upto 870°C
B. Converted to tridymite on firing between 870 to 1470°C
C. Transformed to crystoballite on heating above 1470°C
D. All of the above
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28. Pyrometric cone equivalent (PCE) of a refractory is the measure of its
A. Spalling resistance
B. Fusion point
C. Resistance to slag penetration
D. Resistance to carbon monoxide attack
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