Pumps and Hydraulics Practice Questions for Washington Level I

1. Question 1

   What is the main purpose of flow equalization?

   1. Reduce rapid changes in downstream flow
   2. Increase peak flow into downstream units
   3. Stop all flow during low-use periods
   4. Send the highest flows through treatment first
   Show the answer

   Answer: A. Reduce rapid changes in downstream flow

   Flow equalization stores and releases wastewater in a controlled way so downstream processes receive a steadier flow.

2. Question 2

   How does a peristaltic pump move liquid?

   1. Spin an impeller inside a casing
   2. Compress flexible tubing with rollers
   3. Flex a diaphragm between two chambers
   4. Lift liquid with an air-filled column
   Show the answer

   Answer: B. Compress flexible tubing with rollers

   A peristaltic pump moves liquid as rotating rollers squeeze flexible tubing and push the liquid forward.

3. Question 3

   What moves liquid through a diaphragm pump?

   1. Repeated movement of a flexible diaphragm
   2. Rollers squeezing a length of tubing
   3. A rotating impeller inside a volute
   4. Rising air bubbles inside a vertical pipe
   Show the answer

   Answer: A. Repeated movement of a flexible diaphragm

   A diaphragm pump moves liquid by flexing a diaphragm back and forth, changing the volume of the pumping chamber.

4. Question 4

   What does a flowmeter measure?

   1. The rate liquid moves through a system
   2. The pressure inside an air header
   3. The depth of liquid in a wet well
   4. The temperature of a process sample
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   Answer: A. The rate liquid moves through a system

   A flowmeter measures how much liquid passes a point during a given amount of time, such as gallons per minute or million gallons per day.

5. Question 5

   Which connection is on the **suction side** of a pump?

   1. The outlet carrying flow downstream
   2. The drain used to empty the casing
   3. The inlet bringing liquid to the pump
   4. The vent used to release trapped air
   Show the answer

   Answer: C. The inlet bringing liquid to the pump

   The suction side brings liquid from its source to the pump inlet. The discharge side carries the pumped liquid away.

Operator Master has 8 Level I pumps and hydraulics questions, free, with an explanation after every answer.

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