Steam Boilers, Engines, Nozzles and Turbines
The Locomotive boiler has

167 fire tubes and 14 superheated tubes
157 fire tubes and 24 superheated tubes
137 fire tubes and 44 superheated tubes
147 fire tubes and 34 superheated tubes

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Steam Boilers, Engines, Nozzles and Turbines
The efficiency of a boiler is defined as

Ratio of the mass of steam produced to the mass of total water supplied in a given time
None of these
Ratio of heat actually used in producing steam to the heat liberated in the furnace
Ratio of the heat liberated in the furnace to the heat actually used in producing steam

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