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

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

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

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

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