Level 3 · Advanced sample questions
2 free sample questions on grit removal for the Level 3 · Advanced wastewater treatment operator exam. Try each one, then open the answer to check your work.
Grit from one classifier contains more organics than before. Its grit-pump flow and influent load are steady. A wash-water pressure gauge reads low only when the classifier runs, while pressure at the common wash header remains normal. Where should the restriction be checked first?
Answer: A. Classifier wash-water branch
Normal pressure at the common header shows that wash water is available to the system, while low pressure appears only at this classifier during operation. That pattern locates the likely restriction in the classifier's wash-water branch.
Grit leaves a classifier wetter and with more organics. Wash pressure and grit-pump flow are normal. The controller commands 30 rpm, the speed pickup reads 18 rpm, and drive current is above its normal band. What should be inspected first?
Answer: A. Screw drive system
Normal wash pressure and grit-pump flow rule out those systems. The 30 rpm command, 18 rpm feedback, and high drive current point to the drive or transmission; the flow split does not explain the speed mismatch.
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