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

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

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Steam Boilers, Engines, Nozzles and Turbines
A nozzle is said to be a convergent nozzle

When the cross-section of the nozzle increases continuously from entrance to exit
When the cross-section of the nozzle decreases continuously from entrance to exit
When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
None of these

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