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

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

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Steam Boilers, Engines, Nozzles and Turbines
The object of producing draught in a boiler is

All of the listed here
To exhaust the gases of combustion from the combustion chamber
To provide an adequate supply of air for the fuel combustion
To discharge the gases of combustion to the atmosphere through the chimney

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation is defined as

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

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