Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

None of these
To guide motion of the piston rod and to prevent it from bending
To transfer motion from the piston to the cross-head
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

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

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

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