Which of the following statements is true of...

🔍 Key Concepts

• Study the check valves at the top (near B) and bottom (near G) to determine which side must be suction and which side must be discharge. • Look at the diaphragm and air space (A and E) and think about what powers the motion of the pumping element – is it a motor/impeller or compressed air acting on a flexible member? • Remember that many diaphragm‑type pumps are self‑priming positive displacement pumps, and consider what that implies about needing (or not needing) positive suction pressure.

💭 Think About

• Trace the liquid’s path: if liquid enters through one port, which way would each check valve swing, and where must the liquid leave the pump? • Ask yourself what feature in the drawing shows that the pump is operated by air, not by an electric motor or rotating shaft. • Compare this internal arrangement with what you know about centrifugal pumps versus positive displacement pumps – which one has diaphragms and check valves instead of an impeller?

✅ Before You Answer

• Verify which arrows on the valves show flow direction, then match that with the labels C and G to identify suction versus discharge. • Confirm whether the pump casing and diaphragm arrangement indicate a reciprocating/diaphragm positive displacement design rather than a rotary/centrifugal design. • Consider whether a diaphragm pump driven by air can typically lift liquid from below the pump (self‑priming) or if it would truly require positive suction pressure.

Which of the following statements is true of the illustrated pump? See illustration GS-0061.

It can only operate with positive suction pressure.

The pump discharge is from the outlet marked "G".

It is a positive displacement air operated pump.

The pump suction is through the inlet marked "C".

🔍 Key Concepts

💭 Think About

✅ Before You Answer