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Steam Boilers, Engines, Nozzles and Turbines

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

0.546
0.601
0.577
0.582

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Steam Boilers, Engines, Nozzles and Turbines
The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

cos²α
cot²α
sin²α
tan²α

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Steam Boilers, Engines, Nozzles and Turbines
Thermal equilibrium means that the flow of steam is

Isentropic
Hyperbolic
Isothermal
Polytropic

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

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Steam Boilers, Engines, Nozzles and Turbines
The behavior of coal in a furnace is determined by

The content of sulphur
The proximate analysis
The content of ash and heating value
The exact analysis

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

0.601
0.582
0.546
0.577

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