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

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

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Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Ratio of brake power to the indicated power
Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of thermal efficiency to the Rankine efficiency
Product of thermal efficiency and Rankine efficiency

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