Study Guide Answer Key

Here are the answers to the July 14, 2021 edition of TPO's Exam Study Guide: 1. What type of pump may be started against a closed valve?The answer to the question is D, centrifugal. Centrifugal pumps may be operated against closed valves. Positive displacement pumps (rotary and diaphragm pumps are examples) should never be operated or started against a closed valve. This will damage the pump and/or piping. Understanding the different types of pump characteristics and hydraulics are important for safe operations and are topics on water and wastewater certification examinations. 2. Which chemical reaction represents the precipitation of noncarbonate hardness? The correct answer is A.