Fuels and Combustion
Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called

None of these
Back draughting
Banking
Under pressurising

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Fuels and Combustion
Fuel gases containing hydrocarbons (ie.g. coke oven gas) are not preheated before burning, mainly because

It reduces its calorific value tremendously
The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
It reduces its flame temperature tremendously
There are chances of explosion during preheating

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