Fuels and Combustion
Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of

Too much air for combustion
Correct amount of air for combustion
Pulverised coal in boilers
Less air for combustion

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Fuels and Combustion
Beehive coke oven

Produces coke with very poor strength
Gives larger yield of coke (around 85%) as compared to by-product ovens
Takes 2-3 days for coking of coal but requires no external fuel for heating
Facilitates by-products recovery

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