Steam Boilers, Engines, Nozzles and Turbines
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

Decreases
Remains unchanged
Increases
Increases/decreases depending on steam temperature requirements

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

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

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