Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

Less heating surface
Heating surface depends on other parameters
Equal heating surface
More heating surface

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston rod is

To convert heat energy of the steam into mechanical work
To exhaust steam from the cylinder at proper moment
To transfer motion from the piston to the cross head
To guide motion of the piston rod and to prevent it from bending

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