WATER TREATMENT OPERATOR
LEVEL 1 SAMPLE QUESTIONS
(WATER OPERATOR CERTIFICATION
STUDY GUIDE)
What-are-the-two-important-factors-impacting-the-effectiveness-of-chlorination?---ans-
✔✔Concentration-of-chlorine-and-contact-time
The-treatment-process-that-controls-corrosion-or-scaling-is-known-as-what?---ans-
✔✔Stabilization
Permanganate-reactions-are-highly-dependent-on-what-factor?---ans-✔✔pH
It-is-hardest-to-kill-the-organism-that-causes-what-illness?---ans-✔✔Cryptosporidiosis
Disinfection-of-water-wells-with-free-chlorine-requires-exposure-for-how-long-and-at-what-
concentration?---ans-✔✔12-to-24-hours;-50mg/L
Flocculation-basins-are-usually-designed-to-provide-for-detention-times-of-how-long?---
ans-✔✔15-to-45-minutes
Alum-works-best-in-a-pH-range-of-what?---ans-✔✔5.8-to-7.5
What-has-little-effect-on-colloidal-particles-because-of-their-small-size?---ans-✔✔Gravity
What-natural-electrical-force-keeps-colloidal-particles-apart-in-water-treatment?---ans-
✔✔Zeta-potential
What-does-the-zeta-potential-measure?---ans-✔✔The-number-of-excess-electrons-found-
on-the-surface-of-all-particulate-matter
What-device-collects-the-settled-water-as-it-leaves-the-sedimentation-basin?---ans-
✔✔The-effluent-launder
In-solid-contact-basins-with-fairly-constant-water-quality-parameters,-how-often-should-the-
solids-concentration-be-determined?---ans-✔✔At-least-twice-per-day
LEVEL 1 SAMPLE QUESTIONS
(WATER OPERATOR CERTIFICATION
STUDY GUIDE)
What-are-the-two-important-factors-impacting-the-effectiveness-of-chlorination?---ans-
✔✔Concentration-of-chlorine-and-contact-time
The-treatment-process-that-controls-corrosion-or-scaling-is-known-as-what?---ans-
✔✔Stabilization
Permanganate-reactions-are-highly-dependent-on-what-factor?---ans-✔✔pH
It-is-hardest-to-kill-the-organism-that-causes-what-illness?---ans-✔✔Cryptosporidiosis
Disinfection-of-water-wells-with-free-chlorine-requires-exposure-for-how-long-and-at-what-
concentration?---ans-✔✔12-to-24-hours;-50mg/L
Flocculation-basins-are-usually-designed-to-provide-for-detention-times-of-how-long?---
ans-✔✔15-to-45-minutes
Alum-works-best-in-a-pH-range-of-what?---ans-✔✔5.8-to-7.5
What-has-little-effect-on-colloidal-particles-because-of-their-small-size?---ans-✔✔Gravity
What-natural-electrical-force-keeps-colloidal-particles-apart-in-water-treatment?---ans-
✔✔Zeta-potential
What-does-the-zeta-potential-measure?---ans-✔✔The-number-of-excess-electrons-found-
on-the-surface-of-all-particulate-matter
What-device-collects-the-settled-water-as-it-leaves-the-sedimentation-basin?---ans-
✔✔The-effluent-launder
In-solid-contact-basins-with-fairly-constant-water-quality-parameters,-how-often-should-the-
solids-concentration-be-determined?---ans-✔✔At-least-twice-per-day
