Steam Boilers, Engines, Nozzles and Turbines
Incomplete combustion can be best judged by

Measuring carbon monoxide in flue gases
Smoky chimney exit
Excess air in flue gases
Measuring temperature of flue gases at exit of furnace

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Steam Boilers, Engines, Nozzles and Turbines
The function of a valve rod is

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

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