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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
Over fire burning is the phenomenon of

Burning CO and unburnt in upper zone of furnace by supplying more air
Supply of excess coal
Fuel bed firing
Supply of excess, air

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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

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

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Steam Boilers, Engines, Nozzles and Turbines
Lancashire boiler is of

Natural circulation type
All of the listed here
Stationary < fire tube type
Horizontal type

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Steam Boilers, Engines, Nozzles and Turbines
The numbers of fire tubes in a Cochran boiler are

225
165
75
115

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Steam Boilers, Engines, Nozzles and Turbines
All steam engines work on

Second law of thermodynamics
None of the listed here
Zeroth law of thermodynamics
First law of thermodynamics

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Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Flue gases pass through tubes and water around it
Tubes are laid vertically
Water passes through the tubes and flue gases around it
Forced circulation takes place

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