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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

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

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Steam Boilers, Engines, Nozzles and Turbines
The length of Cornish boiler is of the order of

24 m
79 m
57.5 m
35 m

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

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

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Steam Boilers, Engines, Nozzles and Turbines
In a uniflow engine

Steam enters at one end and exhausts at the centre
Steam enters at the centre and exhausts at the other end
Steam enters and exhausts through the same port
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Scotch marine boiler are

Vertical
Inclined
Horizontal
None of the listed here

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Steam Boilers, Engines, Nozzles and Turbines
Which of the following varieties of coals is mostly used in steam boilers?

None of the listed here
Brown coal
Peat
Non-coking bituminous coal

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