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
Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

Chances of explosion are less in former case
Rate of steam flow is more in former case
Former is used for high installed capacity
Former occupies less space for same power

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Steam Boilers, Engines, Nozzles and Turbines
Carbonization of coal is the process of

Pulverizing coal in inert atmosphere
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Binding the pulverized coal into briquettes
Heating wood in a limited supply of air at temperatures below 300°C

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