Steam Boilers, Engines, Nozzles and Turbines
A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

Supplied mounted on a single base
Supplied by same manufacturer loose and assembled at site
Packaged boiler does not exist
Purchased from several parties and packed together at site

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

To guide motion of the piston rod and to prevent it from bending
None of these
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
Locomotive boiler is a

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

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