Steam Boilers, Engines, Nozzles and Turbines
Efficiency of Rankine cycle can be increased by

Decreasing exhausts pressure
Increasing the expansion ratio
Increasing exhaust pressure
Decreasing initial steam pressure and temperature

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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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