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

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

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

The expansion of steam takes place partly in the fixed blades and partly in the moving blades
The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters 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 water tube boilers

Water passes through the tubes which are surrounded by flames and hot gases
None of these
The flames and hot gases pass through the tubes which are surrounded by water
Forced circulation takes place

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