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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
The reheat factor depends upon

All of these
Exit pressure
Turbine stage efficiency
Initial pressure and superheat

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Steam Boilers, Engines, Nozzles and Turbines
The impulse turbine rotor efficiency will have a maximum value of 0.5 cos 2α, where α is the nozzle exit flow angle, if the

Blades are equiangular
Blade velocity coefficient is unity
Blade solidity is 0.65
Blades are equiangular and frictionless

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Steam Boilers, Engines, Nozzles and Turbines
Efficiency of a thermal cycle increases by

Both (A) and (B)
Regeneration
Reheating of steam
Cooling of steam

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Steam Boilers, Engines, Nozzles and Turbines
Boiler stays are used to

Prevent flat surfaces under pressure from tearing apart
Take care of failure in shear
Provide support for boiler
Take care of failure in compression

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Steam Boilers, Engines, Nozzles and Turbines
Orsat meter is used for

Volumetric analysis of the flue gases
Gravimetric analysis of the flue gases
Measuring smoke density of flue gases
Mass flow of the flue gases

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Steam Boilers, Engines, Nozzles and Turbines
Water boils when its vapor pressure

Equals the pressure of water in the container
Equals 760 mm of mercury
Equals that of the surroundings
Equals to atmospheric pressure

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