Steam Boilers, Engines, Nozzles and Turbines
In fire tube boilers

None of these
The flames and hot gases pass through the tubes which are surrounded by water
Water passes through the tubes which are surrounded by flames and hot gases
Forced circulation takes place

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

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

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