Exam Study Guide: Diffusers and Motor Bearing Damage Prevention

Maintaining your education is important, especially in a career that demands licensing exams. Prove you’re an expert operator by answering these questions and others from our Exam Study Guide Series.

Exam Study Guide: Diffusers and Motor Bearing Damage Prevention

Welcome back to TPO magazine's Exam Study Guide Series, which offers a pair of water/wastewater study questions with in-depth explanations of the answers. Last time, we covered a set of wastewater and drinking water treatment questions on the topics of Sludge Wasting Rate and Mechanical Seals. This time you can test your knowledge about diffusers and motor bearing damage prevention.

Wastewater Treatment Sample Question

What type of diffuser gives the best oxygen transfer but are less efficient at mixing?

A. Coarse 
B. Fine
C. Volcano pressurized
D. Mechanical 

Water Treatment Sample Question

What component helps prevent motor bearing damage from water leakage inside the stuffing box? 

A. Lantern ring
B. Slinger ring
C. Snap ring
D. Wear ring

To see answers for both of the above questions, click this link.

About the authors: Rick Lallish is the Water Pollution Control program director at the Environmental Resources Training Center (ERTC) of Southern Illinois University-Edwardsville. He provides training for entry-level operators in the wastewater field and operators throughout the state looking to further their education. Lallish was also named the 2017 Illinois Operator of the Year and 2018 president of the Illinois Association of Water Pollution Control Operators.

Drew Hoelscher is the program director of drinking water operations at the Environmental Resources Training Center in Edwardsville, Illinois.


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