In a dual-stage pump, during which operation does each impeller take water from a source and deliver it to the discharge?

In a dual-stage pump, during which operation does each impeller take water from a source and deliver it to the discharge?

• A. Volume
• B. Pressure
• C. Parallel
• D. Series

Answer: (A)

In dual-stage pumps, you can connect the impellers in two ways: in series to boost pressure, or in parallel to boost volume. When the system is in parallel, each impeller draws water from the same intake and their flows are combined at the discharge, so the total output increases. That means every impeller is actively taking water from the source and delivering it to the discharge, which explicitly describes parallel operation. If the impellers were arranged in series, water would pass through one impeller and then the other, raising the pressure (head) of the same flow rather than increasing the total volume produced at once.

In dual-stage pumps, you can connect the impellers in two ways: in series to boost pressure, or in parallel to boost volume. When the system is in parallel, each impeller draws water from the same intake and their flows are combined at the discharge, so the total output increases. That means every impeller is actively taking water from the source and delivering it to the discharge, which explicitly describes parallel operation.

If the impellers were arranged in series, water would pass through one impeller and then the other, raising the pressure (head) of the same flow rather than increasing the total volume produced at once.