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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

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

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Steam Boilers, Engines, Nozzles and Turbines
In a velocity compounded impulse turbine, when steam flows through the second row of moving blades,

Pressure remains constant
Velocity decreases
Velocity increases
Velocity remains constant

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Steam Boilers, Engines, Nozzles and Turbines
An economiser is generally placed between

Last superheater or reheater and air preheater
Air preheater and chimney
None of these
Induced draft fan and forced draft fan

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Steam Boilers, Engines, Nozzles and Turbines
The mechanical draught _________ with the amount of smoke.

Decreases
Increases
Does not effect
None of these

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Steam Boilers, Engines, Nozzles and Turbines
Primary air is the air used to

Provide air around burners for obtaining optimum combustion
Convert CO (formed in lower zone of furnace) into CO₂ at higher zone
Transport and dry the coal
Air delivered by forced draft fan

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Steam Boilers, Engines, Nozzles and Turbines
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

Air-preheater
Injector
Economizer
Superheater

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