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

To guide motion of the piston rod and to prevent it from bending
To exhaust steam from the cylinder at proper moment
To transfer motion from the piston to the cross head
To convert heat energy of the steam into mechanical work

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following statement is correct for a compound steam engine?

The ratio of expansion is reduced, thus reducing the length of stroke
The forces in the working parts are increased as the forces are distributed over more parts
The temperature range per cylinder is increased, with corresponding increase in condensation
The cost of the engine, for the same power and economy, is more than that of a simple steam engine

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