Steam Boilers, Engines, Nozzles and Turbines
The function of an eccentric rod is

To convert reciprocating motion of the piston into rotary motion of the crank
To provide simple harmonic motion to the D-slide valve
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To provide reciprocating motion to the slide valve

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

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

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