Steam Boilers, Engines, Nozzles and Turbines
Relative percentage of heat absorbed through the heat transfer of(i) Furnace water wall(ii) Boiler tank(iii) Superheater(iv) Economizer(v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

48 : 20 : 15 : 7 : 10
20 : 48 : 7 : 15 : 10
7 : 15 : 20 : 10 : 48
10 : 7 : 15 : 20 : 48

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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 steam is expanded in moving blades only
The pressure and temperature of steam remains constant
The steam is expanded both in fixed and moving blades continuously

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

From a metal wall from one medium to another
By direct mixing
Heat is transferred by bleeding some gases from furnace
From heating an intermediate material and then heating the air from this material

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

The given boiler with the model
Any type of boilers operating under any conditions
The two different boilers of the same make
Two different makes of boilers operating under the same operating conditions

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