🔍 Key Concepts

• Positive displacement gear pumps and how they move fluid in discrete pockets • How herringbone (double helical) gear teeth mesh compared to simple spur teeth • What happens to flow pulsations when discharge phases overlap

💭 Think About

• In any gear pump, when and how does fluid actually leave the discharge port during one revolution of the gears? Think about whether the flow is continuous or in pulses. • How does the angled, overlapping tooth pattern of a herringbone gear affect the timing of when new pockets of fluid reach the discharge side? • Which choice describes a change in the timing of discharge events, rather than just changing size, number of gears, or clearances?

✅ Before You Answer

• Make sure the option you choose directly addresses smoother, less pulsating discharge flow, not efficiency or leakage alone. • Ask: does the explanation involve overlapping discharge events so one begins before the last one ends? • Confirm that the reasoning is about how the teeth mesh and carry fluid, not simply how many gears are present.