Fusible plug is used in a boiler to/for :
Extinguish
the fire
Preheat steam
Superheating the steam
Discharge
excess water
Extinguish
the fire
The function
of fusible plug is to protect the boiler from damage due to overheating of
boiler tubes by low water level, it is simply a hollow gun metal plug screwed
into the fire box crown.
Hence, the
correct option is (A).
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