Steam Boilers, Engines, Nozzles and Turbines
Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

Fouling of heat transfer surfaces
High calorific value coal being burnt
Raising of steam temperature
Higher effectiveness of boiler

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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
None of these
To indicate the water level inside the boiler to an observer
To measure pressure of steam inside the steam boiler

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