Headworks and Screening Practice Questions for Level 4 · Expert

1. Question 1

   Two parallel screen bays have separate upstream approaches and a common downstream channel. At peak flow, Bay 1 receives 65% of the flow and reaches its differential-level limit while Bay 2 remains below half its tested capacity. Both rakes operate normally. What is the best operating response?

   1. Increase both rake speeds
   2. Lower the common downstream channel
   3. Rebalance gates and verify bay loadings
   4. Raise Bay 1's differential-level limit
   Show the answer

   Answer: C. Rebalance gates and verify bay loadings

   The screen equipment is working, but the separate approaches are distributing flow unevenly. Rebalancing and verifying both loads uses available capacity without weakening protection.

2. Question 2

   A plant is selecting replacement panels for two drum microscreens. A 30-day trial shows that 40-micron panels improve capture by 8%, but cut peak hydraulic capacity by 25% and double wash-water use. The existing 100-micron panels meet downstream solids targets and wet-weather capacity. Which recommendation is best?

   1. Use 40-micron panels and increase wash frequency
   2. Retain 100-micron panels for verified plant capacity
   3. Put 40-micron panels on one drum and keep one 100-micron drum
   4. Use 40-micron panels during dry weather and change them before storms
   Show the answer

   Answer: B. Retain 100-micron panels for verified plant capacity

Operator Master has 2 Level 4 · Expert headworks and screening questions, free.

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