Which of the following statements concerning...

🔍 Key Concepts

• Difference between positive displacement and non-positive displacement (centrifugal) pumps • What it means for a pump to be self-priming vs. needing an external vacuum-priming system • Effect of pump location above vs. below the potable water tanks on the pump’s ability to maintain suction

💭 Think About

• First, decide which type of pump can usually lift water (create suction) even when not completely flooded, and which type generally cannot. • Then think about when a vacuum-priming system is needed: is it to help a pump that is already flooded, or to help a pump that is higher than the liquid level? • Compare each choice against the physical situation: is the pump above or below the tank, and is it a type that normally needs help to get primed?

✅ Before You Answer

• Make sure you clearly know which pump type is self-priming or can create suction and which normally must be flooded. • Verify which arrangement (above or below tank) naturally keeps the pump flooded by gravity and which one leaves the suction line full of air. • Eliminate any options where a pump that is already below tank level (and thus flooded) is said to "require" a vacuum-priming system.

Which of the following statements concerning the arrangements of a potable water system is true?

Potable water pumps of the non-positive displacement type require a vacuum-priming system if located above the potable water storage tanks.

Potable water pumps of the positive displacement type require a vacuum-priming system if located above the potable water storage tanks.

Potable water pumps of the positive displacement type require a vacuum-priming system if located below the potable water storage tanks.

Potable water pumps of the non-positive displacement type require a vacuum-priming system if located below the potable water storage tanks.

🔍 Key Concepts

💭 Think About

✅ Before You Answer