Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the fan
Efficiency of the chimney
Power of the boiler
Efficiency of the boiler

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Handling and maintenance should be easier
Stack gases should not be cooled to the dew point
Approach temperature should be as low as possible
Heat transfer area should be optimum

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