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

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

None of these
To measure pressure of steam inside the steam boiler
To indicate the water level inside the boiler to an observer
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

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