Plant Operations Practice Questions for Level 1 · Entry

1. Question 1

   What is the basic job of a surface aerator?

   1. Settle biological solids below the surface
   2. Add oxygen and circulate basin water
   3. Measure oxygen and record basin readings
   4. Remove foam from the basin surface
   Show the answer

   Answer: B. Add oxygen and circulate basin water

   A surface aerator moves water at the basin surface to transfer oxygen and provide mixing.

2. Question 2

   What happens in a trickling filter?

   1. Media circulates through an aeration basin
   2. Sludge settles beneath rotating treatment discs
   3. Air carries wastewater around dry media
   4. Wastewater flows over attached-growth media
   Show the answer

   Answer: D. Wastewater flows over attached-growth media

   A trickling filter distributes wastewater over media where attached microorganisms help remove biodegradable waste.

3. Question 3

   What is the basic purpose of tertiary filtration?

   1. Inactivate organisms before discharge
   2. Remove remaining suspended particles
   3. Measure the final effluent flow rate
   4. Increase chlorine residual after filtration
   Show the answer

   Answer: B. Remove remaining suspended particles

   Tertiary filtration removes particles that remain after secondary treatment, helping further polish the effluent.

4. Question 4

   How does a wastewater sand filter remove particles?

   1. Pass water across rotating filter panels
   2. Strain water through a surface screen
   3. Pass water through sand or similar media
   4. Hold water still so particles can settle
   Show the answer

   Answer: C. Pass water through sand or similar media

   A sand filter passes wastewater through granular media that captures remaining suspended particles.

5. Question 5

   What part of a disc filter captures suspended particles?

   1. The filter panels mounted on the discs
   2. The air diffusers below the filter tank
   3. The granular bed beneath the discs
   4. The settling zone between the discs
   Show the answer

   Answer: A. The filter panels mounted on the discs

   A disc filter uses filter panels mounted on rotating discs to capture suspended particles from the water.

Operator Master has 54 Level 1 · Entry plant operations questions, free.

• Math and Calculations50 questions
• Laboratory13 questions
• Safety13 questions
• Biological Treatment12 questions
• Disinfection10 questions
• Pumps and Hydraulics8 questions
• Regulations and Compliance8 questions
• Solids Handling8 questions
• Primary Treatment6 questions
• Secondary Clarification5 questions
• Grit Removal4 questions
• Headworks and Screening4 questions