Steam Boilers, Engines, Nozzles and Turbines
The relative efficiency is defined as the

Product of thermal efficiency and Rankine efficiency
Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of brake power to the indicated power
Ratio of thermal efficiency to Rankine efficiency

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

It increases thermal efficiency
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
Inherent moisture and surface moisture are different things

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