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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Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

All of these
There is no pressure drop due to condensation
The expansion (or compression) of the steam is hyperbolic
Steam is admitted at boiler pressure and exhausted at condenser pressure

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