Steam Boilers, Engines, Nozzles and Turbines
The proximate analysis of fuel lists

Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

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

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

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