Steam Boilers, Engines, Nozzles and Turbines
Which is not the correct statement about moisture in coal?

In some coals moisture may be present up to 40%
Some moisture in coal helps in better burning which is not possible with completely dry coal
It increases thermal efficiency
Inherent moisture and surface moisture are different things

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

From heating an intermediate material and then heating the air from this material
By direct mixing
From a metal wall from one medium to another
Heat is transferred by bleeding some gases from furnace

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