The fusible
plug in small boilers is located
In the drum
In the fire tubes
Above steam
dome
Over the
combustion chamber
Over the
combustion chamber
A fusible
plug operates as a safety valve when dangerous temperatures, rather than
dangerous pressures, are reached in a closed vessel. In steam engines
the fusible plug is screwed into the crown sheet (the top plate) of
the firebox or over the combustion chamber.
Hence, the
correct option is (D).
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