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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Sulphur in coal results in

Spontaneous combustion during coal storage
All of these
Corroding air heaters
Facilitating ash precipitation

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge through a chimney occurs when the height of chimney is

Outside temperature is very low
Infinitely long
Around 200 meters
Equal to the height of the hot gas column producing draught

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Steam Boilers, Engines, Nozzles and Turbines
The ratio of the useful heat drop to the isentropic heat drop is called

Condenser efficiency
Vacuum efficiency
Nozzle efficiency
Boiler efficiency

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio for initially wet steam is

0.577
0.546
0.582
0.601

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Steam Boilers, Engines, Nozzles and Turbines
The critical pressure ratio (p₂/p₁) is given by

(p₂/p₁) = [(n + 1)/2] n - (1/n)
(p₂/p₁) = [2/(n - 1)] n/(n + 1)
(p₂/p₁) = [2/(n + 1)] n/(n-1)
(p₂/p₁) = [(n - 1)/2] n + (1/n)

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Steam Boilers, Engines, Nozzles and Turbines
The impulse reaction turbine has its driving force

Partly as an impulsive force and partly as a reaction force
None of the listed here
As an impulsive force
As a reaction force

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