Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine

The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
The expansion of steam takes place partly in the fixed blades and partly in the moving blades
The steam is expanded from a high pressure to a condenser pressure in one or more nozzles
The pressure and temperature of steam remains constant

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Steam Boilers, Engines, Nozzles and Turbines
In an impulse turbine

The steam is expanded in nozzles only and there is a pressure drop and heat drop
The pressure and temperature of steam remains constant
The steam is expanded in moving blades only
The steam is expanded both in fixed and moving blades continuously

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

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 amount of water evaporated from and at 100° C into dry and saturated steam
The evaporation of 15.653 kg of water per hour from and at 100° C

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