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Steam Boilers, Engines, Nozzles and Turbines

Steam Boilers, Engines, Nozzles and Turbines
An economiser in a boiler

Increases steam flow
Increases steam pressure
Decreases steam pressure
Decreases fuel consumption

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Steam Boilers, Engines, Nozzles and Turbines
In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, pā‚‚) will be

3.3 bar
9.9 bar
5.46 bar
8.2 bar

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

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

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Steam Boilers, Engines, Nozzles and Turbines
The maximum discharge of steam through a convergent-divergent nozzle depends upon

Final pressure of steam leaving the nozzle
Area of nozzle at throat
Both (A) and (B)
Initial pressure and volume of steam

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Steam Boilers, Engines, Nozzles and Turbines
The effect of friction in the nozzle ___ dryness fraction of steam.

Decreases
None of the listed here
Has no effect on
Increases

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

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

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