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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

640 m/s
640/3 m/s
160/3 m/s
320/3 m/s

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

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

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The basic purpose of drum in boiler is to

Serve as storage of feed water for water wall
Remove salts from water
Serve as storage of steam
Separate steam from water

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Steam Boilers, Engines, Nozzles and Turbines
On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by

Vertical straight line
Horizontal straight line
Curved line
Straight inclined line

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Steam Boilers, Engines, Nozzles and Turbines
Ultimate analysis of fuel is determination of percentage of

Fixed carbon, ash, volatile matter, moisture
Carbon, hydrogen, nitrogen, sulphur, moisture
Higher calorific value
Lower calorific value

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