Question 143General Subjects - Assistant Engineer

The correct answer is A) Enabling the lead pump to cycle on and off during periods of relatively low demand and the lag pump to assist the lead pump only when the demand is high. The primary purpose of the lead-lag arrangement of the two potable water pumps is to provide a more efficient and reliable water supply system. The lead pump is designed to handle the typical or lower water demand, cycling on and off as needed. The lag pump is then only activated when the demand is higher, assisting the lead pump to meet the increased requirement. This arrangement allows the system to conserve energy and reduce wear on the pumps during periods of lower usage, while still having the capacity to meet peak demands. The other options are incorrect as they do not accurately describe the typical lead-lag pump configuration and its intended purpose.