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

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

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Steam Boilers, Engines, Nozzles and Turbines
In water tube boilers

Forced circulation takes place
The flames and hot gases pass through the tubes which are surrounded by water
None of these
Water passes through the tubes which are surrounded by flames and hot gases

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