Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the minimum amount of oil required for a system that circulates 30 gallons of oil per minute with complete oil changes every 8 minutes?

180 gallons
240 gallons
300 gallons
360 gallons

The correct answer is: 240 gallons

To determine the minimum amount of oil required for the system, we need to figure out how much oil is circulated in a full cycle of complete oil changes. The system circulates 30 gallons of oil per minute. Given that there are complete oil changes every 8 minutes, we can calculate the total oil circulated in 8 minutes by multiplying the circulation rate by the time period. 30 gallons/minute × 8 minutes = 240 gallons. This means that to carry out a complete oil change every 8 minutes, you need at least 240 gallons of oil available in the system. Therefore, the correct answer reflects the necessity to have enough oil on hand to ensure that the system can maintain continuous operation while allowing for complete oil replacement every cycle. This allows the system to operate efficiently without depleting its oil supply during the change.