Steam Boilers, Engines, Nozzles and Turbines
Expansion ratio is the ratio of

Volume at cut-off to the swept volume
Swept volume to the clearance volume
Swept volume to the volume at cut-off
Clearance volume to the swept volume

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

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

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