Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

Two different makes of boilers operating under the same operating conditions
The given boiler with the model
Any type of boilers operating under any conditions
The two different boilers of the same make

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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 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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