Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

Heating surface depends on other parameters
More heating surface
Equal heating surface
Less heating surface

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

The evaporation of 15.653 kg of water per hour from and at 100°C
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 ratio of heat actually used in producing the steam to the heat liberated in the furnace

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