Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

All of the listed here
To provide an adequate supply of air for the fuel combustion
To exhaust the gases of combustion from the combustion chamber
To discharge the gases of combustion to the atmosphere through the chimney

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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
All of these
To determine the generating capacity of the boiler
To determine the thermal efficiency of the boiler when working at a definite pressure

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