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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
160/3 m/s
640 m/s

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Steam Boilers, Engines, Nozzles and Turbines
The factor of evaporation for all boilers is always

Less than unity
Equal to unity
Greater than unity
None of these

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Steam Boilers, Engines, Nozzles and Turbines
The friction in the nozzle __________ exit velocity of steam.

None of these
Decreases
Increases
Has no effect on

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

165
225
75
115

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Steam Boilers, Engines, Nozzles and Turbines
The fire tubes in a Locomotive boiler has __________ diameter.

7.45 mm
47.5 mm
4.75 mm
5.47 mm

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Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about the function of furnace?

Separate ash from coal
Mix fuel with air and ignite
Maintain heat supply to prepare and ignite the incoming fuel
To provide proper conditions for continuous complete combustion

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