Steam Boilers, Engines, Nozzles and Turbines
The difference between Cornish boiler and Lancashire boiler is that

Former is water tube type and latter is fire tube type
None of the listed here
Former is fire tube type and latter is water tube type boiler
Former contains one fire tube and latter contains two fire tubes

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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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