Steam Boilers, Engines, Nozzles and Turbines
Incomplete combustion can be best judged by

Measuring temperature of flue gases at exit of furnace
Measuring carbon monoxide in flue gases
Excess air in flue gases
Smoky chimney exit

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Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

The flames and hot gases pass through the tubes which are surrounded by water
None of these
Water passes through the tubes which are surrounded by flames and hot gases
Forced circulation takes place

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