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

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

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Steam Boilers, Engines, Nozzles and Turbines
In cross compounding, the cylinders are arranged

At 90° and each cylinder has common piston, connecting rod and crank
Side by side and each cylinder has common piston, connecting rod and crank
At 90° and each cylinder has separate piston, connecting rod and crank
Side by side and each cylinder has separate piston, connecting rod and crank

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