Steam Boilers, Engines, Nozzles and Turbines
Locomotive boiler is a

Multi-tubular, horizontal, externally fired and stationary boiler
Single tube, vertical, externally fired and stationary boiler
Single tube, horizontal, internally fired and stationary boiler
Multi-tubular, horizontal, internally fired and mobile boiler

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

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

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