Question 143General Subjects - Assistant Engineer70% to pass
What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system?
AI Explanation
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.
Related Questions
#141 Which of the following statements concerning the arrangements of a potable water system is true? #142 On most commercial cargo vessels with a relatively small crew size and few users of the potable water system, how is the potable water system pressure maintained? #144 What design feature is used to minimize potable water wastage associated with hot water distribution piping for a potable water system? #145 What are the operating characteristics of a "waterlogged" potable water system hydro- pneumatic header tank that needs to be recharged with compressed air? #146 Suppose the pressure switch used to control the "lead" potable water pump is set at 45 psig cut-in for pump start and 55 psig cut-out for pump stop. What would be an appropriate setting for the "lag" potable water pump?