Final answer:
With a first class engineer's license Grade B, you would generally be allowed to operate low-pressure boilers and their appurtenances, but not high-pressure boilers. There may also be a limitation on the total boiler horsepower you can oversee.Option A is the correct answer.
Step-by-step explanation:
If you hold a first class engineer's license Grade B, this typically allows you to have operating responsibility for low-pressure boilers and their appurtenances. This kind of license generally does not extend to high-pressure boilers, which are typically covered by more advanced licensing.
Furthermore, there may also be a limitation on the total boiler horsepower you can be responsible for, often not to exceed a specific threshold, for instance, 50 horsepower for liquid or vapor boilers and their appurtenances.
Holding a Grade B first-class engineer's license grants operational authority for low-pressure boilers. However, limitations may exclude high-pressure boilers, typically governed by advanced licenses. Moreover, a specified threshold, like 50 horsepower, could restrict total responsibility for liquid or vapor boilers and associated equipment.