Steam Boilers, Engines, Nozzles and Turbines
Which is not the correct statement about moisture in coal?

Inherent moisture and surface moisture are different things
It increases thermal efficiency
Some moisture in coal helps in better burning which is not possible with completely dry coal
In some coals moisture may be present up to 40%

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Steam Boilers, Engines, Nozzles and Turbines
In accelerated circulation type boiler

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Water is converted into steam in one pass without any recirculation
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Feed pump is employed to supplement natural circulation in water wall type furnace

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Handling and maintenance should be easier
Approach temperature should be as low as possible
Heat transfer area should be optimum
Stack gases should not be cooled to the dew point

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Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about effect of sulphur in fuel?

It has heating value
It helps in electrostatic precipitation of ash in flue gases
It erodes furnace walls
It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

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