Steam Boilers, Engines, Nozzles and Turbines
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has

Equal heating surface
Less heating surface
More heating surface
Heating surface depends on other parameters

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Steam Boilers, Engines, Nozzles and Turbines
The function of a safety valve is

None of these
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
To measure pressure of steam inside the steam boiler
To indicate the water level inside the boiler to an observer

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