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Water Operator Class 3-Practice Test Questions

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2025/2026 Written for academic year
Institution Water Operator Class 3-
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Water Operator Class 3-Practice Test Questions
0.08 ppm - (correct Answer) - MCL for TTHM's

0.06 ppm - (correct Answer) - MCL for HAA5's

0.01 ppm - (correct Answer) - MCL for Arsenic

0.015 ppm - (correct Answer) - MCL for Lead

90 days - (correct Answer) - Turbidity meter must be calibrated every:

Less than 0.3 for 95% of the time. - (correct Answer) - MCL for turbidity is

2 buffers - (correct Answer) - pH meters must be calibrated using

Algae blooms - (correct Answer) - A grassy of fishy taste in reservoir water indicates

Improper backwashing of filters - (correct Answer) - Mudballs are caused by

Carbonate - (correct Answer) - Lime can only be used to soften water with

0 ppm - (correct Answer) - Water leaving Zeolite softener has a hardness of

Schmutzdecke - (correct Answer) - The top layer of a slow sand filter is called the

Coagulation, flocculation, sedimentation - (correct Answer) - A solids contact unit combines

4 ppm, 2 ppm - (correct Answer) - The PMCL for fluoride is: The SMCL is:

Warmer - (correct Answer) - Flock will settle better in warm or cool water?

High pH - (correct Answer) - The greensand manganese removal process requires a:

Volatile organic compounds & gases (odor) - (correct Answer) - Aeration releases what from water?

Amperomatic tiration - (correct Answer) - The most accurate method of determining chlorine residual is:

Sulfuric acid - (correct Answer) - An alkalinity sample is titrated using

Mixing and measuring - (correct Answer) - A beaker is used for

Nephelometric turbidity units - (correct Answer) - NTU stands for:

5 years, 10 years - (correct Answer) - Bacteria results must be kept for: Chem results for:

Tubrbine, Propeller, Venturi, Nutating discs - (correct Answer) - Four ways water meters operate are:

Procedure, Part, Budget, Cost - (correct Answer) - A preventative maintenance program includes:

Lower insurance rates - (correct Answer) - An advantage of a standpipe:

Geographic Informaton System - (correct Answer) - What is GIS?

, Cavitation (boiling) - (correct Answer) - High flow rates in pumps can cause.

Mechanical rakes, drag chain, traveling bridges - (correct Answer) - Three ways sludge is removed from a
settling basin are

Inlet, Outlet, Settling, Sludge - (correct Answer) - The 4 zones of settling basin are:

Before - (correct Answer) - Polyphosphates are injected before or after chlorination?

Filter aid - (correct Answer) - A nonionic polymer is usually used as a:

Giardia, Legionella, Cryptosporidium - (correct Answer) - Three "bugs" targeted by the SWTR are:

Returned to plant head - (correct Answer) - What should be done with backwash water?

Taste, odor, chlorine, THM's - (correct Answer) - Activated carbon is used to remove:

Adsorption, oxidation, or aeratoin - (correct Answer) - THM's can be removed by:

Less - (correct Answer) - Algae produces more or less oxygen at night as compared to day?

99.99% - (correct Answer) - A LOG removal of 4 is a removal of what percent?

Removes color, taste, odor - (correct Answer) - One outstanding advantage to ozone is:

Monochloromines, Dichloramines, Trichlorimaines - (correct Answer) - Three forms of combined chlorine
residual are:

THM's - (correct Answer) - TOC's are precursor in the formation of:

Deliver very accurate volumes - (correct Answer) - A pipet is used to

Bug in a dormant state - (correct Answer) - What is a spore?

Straight edge, feeler gauge - (correct Answer) - List some tools used to align a coupling between a motor
and a pump.

Differential pressure - (correct Answer) - Rate of flow controllers work on

Head pressure at various points - (correct Answer) - What is hydraulic grade line?

tall buildings - (correct Answer) - An RPZ backflow preventor is used for

90% - (correct Answer) - Electric motors in a water plant accounts for what percent of the total electrical
use?

Methemoglobinemia - (correct Answer) - Excessive nitrates in water causes:

50% - (correct Answer) - Filter beds should expand ____ when backwashing.

Eutrophic - (correct Answer) - When a reservoir is rich in nutrients such as phosphates and nitrogen, its
condition is:

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