The mode in which water enters each impeller at the same time, providing large volume with limited pressure is called the PARALLEL mode.

The mode in which water enters each impeller at the same time, providing large volume with limited pressure is called the PARALLEL mode.

• A. Parallel
• B. Series
• C. Dual
• D. Combined

Answer: (A)

In a centrifugal pump, arranging impellers to share the same inlet and discharge increases the volume of water produced without raising the discharge pressure. When impellers operate in parallel, water is fed to both impellers at the same time and their outputs combine, yielding a higher overall flow (volume) while the head (pressure) stays about the same as a single impeller would provide. This is the situation described as parallel: you get a large volume with limited pressure because the energy per unit of water isn’t increased; you’re simply pushing more water through two paths at once. If impellers were arranged in series, the water would pass through one impeller and then the next, boosting the energy added to the water and raising the pressure, but the overall flow would not increase correspondingly. The terms dual or combined aren’t standard ways to describe this mechanism and don’t capture the same behavior as parallel or series configurations. So the mode described—water entering each impeller at the same time and delivering a large volume with limited pressure—matches the parallel arrangement.

In a centrifugal pump, arranging impellers to share the same inlet and discharge increases the volume of water produced without raising the discharge pressure. When impellers operate in parallel, water is fed to both impellers at the same time and their outputs combine, yielding a higher overall flow (volume) while the head (pressure) stays about the same as a single impeller would provide. This is the situation described as parallel: you get a large volume with limited pressure because the energy per unit of water isn’t increased; you’re simply pushing more water through two paths at once.

If impellers were arranged in series, the water would pass through one impeller and then the next, boosting the energy added to the water and raising the pressure, but the overall flow would not increase correspondingly. The terms dual or combined aren’t standard ways to describe this mechanism and don’t capture the same behavior as parallel or series configurations.

So the mode described—water entering each impeller at the same time and delivering a large volume with limited pressure—matches the parallel arrangement.