A device used
to put off fire in the furnace of the boiler when the level of the water in the
boiler falls to an unsafe limit is called:
Economiser
Blow off cock
Super-heater
Fusible plug
Fusible plug
Fusible plug
is a safety device used for preventing the level of water from going down below
the unsafe limit.
It is a
threaded metallic cylindrical object with a tapered hole in it which goes
through its entire length.
Hence, the
correct option is (D).
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