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

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

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Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

All of these
To determine the thermal efficiency of the boiler when working at a definite pressure
To prepare heat balance sheet for the boiler
To determine the generating capacity of the boiler

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