Q
A coal with high ash content is undesirable, as________________?
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A
A. It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber
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B
B. The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace
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C
And causes its spalling due to different co-efficient of expansion/contraction of the refractory
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D
And the ash
Correct Answer:
D. And the ash
