Fuels and Combustion
Stack (chimney) height in a big thermal power plant is dictated by the

Limitation of constructional facilities
Draught to be created
Pollution control aspect
None of these

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Fuels and Combustion
Washing of coal

All of these
Controls its ash fusibility and increases its calorific value
Improves its coking properties
Reduces its sulphur and ash content

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