Steam Boilers, Engines, Nozzles and Turbines
The aim of a compound steam engine is

To reduce the ratio of expansion in each cylinder
To reduce the temperature range in each cylinder
To reduce the length of stroke
All of these

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Steam Boilers, Engines, Nozzles and Turbines
The power of a boiler may be defined as

The amount of water evaporated or steam produced in kg per kg of fuel burnt
The amount of water evaporated from and at 100° C into dry and saturated steam
The evaporation of 15.653 kg of water per hour from and at 100° C
The ratio of heat actually used in producing the steam to the heat liberated in the furnace

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

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

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