Function of fusible plug in a boiler is to ______________________?
Correct answer: D. Put off fire in the furnace when water level in the boiler falls to unsafe limit
- A. Drain out water and sludge from the boiler during repair
- B. All A, B. & C
- C. Guard the boiler in case of abnormal rise in steam pressure
- D. Put off fire in the furnace when water level in the boiler falls to unsafe limit
Explanation
A fusible plug melts when the water level falls enough to expose it to excessive furnace heat, releasing water or steam and extinguishing the fire. It is not a pressure-safety device, which is the function of a safety valve.
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