Steam Boilers, Engines, Nozzles and Turbines
Cut-off ratio is the ratio of

Clearance volume to the volume at cut-off
Swept volume to the volume at cut-off
Volume at cut-off to the swept volume
Volume at cut-off to the clearance volume

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

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

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