Steam Boilers, Engines, Nozzles and Turbines
Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

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

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

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

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