Question 143Steam Plants - Assistant Engineer

The correct answer is C) steam flow and drum water level. A two-element boiler feed water regulator is controlled by the steam flow and the drum water level. The steam flow represents the demand for steam, while the drum water level indicates the supply of water to the boiler. The regulator adjusts the feed water flow to match the steam demand and maintain the proper water level in the drum, which is essential for efficient and safe boiler operation. The other options are incorrect because they do not accurately describe the control parameters of a two-element boiler feed water regulator. Option A and D are incorrect as they do not include the drum water level, which is a critical parameter for the regulator. Option B is incorrect as it does not include the steam flow, which is necessary to match the feed water supply to the demand.