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

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Steam Boilers, Engines, Nozzles and Turbines
In regenerative air preheaters, the heat is transferred

Heat is transferred by bleeding some gas from furnace
By direct mixing
From heating an intermediate material and then heating the air from this material
From a metal wall from one medium to another

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Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

All of these
To determine the generating capacity of the boiler
To prepare heat balance sheet for the boiler
To determine the thermal efficiency of the boiler when working at a definite pressure

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