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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
A supercritical boiler is one that operates above the pressure and temperature of following values

218 kg/cm² abs and 373°C
218 kg/cm² abs and 540°C
1 kg/cm² and 100°C
100 kg/cm² and 540°C

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Steam Boilers, Engines, Nozzles and Turbines
De-Laval turbines are mostly used

For small power purposes and low speeds
For small power purposes and high speeds
Where low speeds are required
For large power purposes

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Steam Boilers, Engines, Nozzles and Turbines
Adiabatic process is

Constant temperature process
Non-heat transfer process
Essentially an isentropic process
Reversible process

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Steam Boilers, Engines, Nozzles and Turbines
A stage, in reaction turbine, is represented by

Number of exits of steam
Each row of blades
Number of casing
Number of entries of steam

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Steam Boilers, Engines, Nozzles and Turbines
Feed water conditioning in thermal power plants in done to

Increase heat transfer rate
Increase steam parameters
Reduce hardness and for removal of solids
Increase efficiency of thermal power plant

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Steam Boilers, Engines, Nozzles and Turbines
The clearance in the engine cylinder

Decreases the efficiency of the engine
All of these
Increases the mean effective pressure
Increases the workdone

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