Texas Wastewater Operator Class B License – Questions and Answers 2026–2027 | Comprehensive wastewater certification exam study guide for an A+ grade

Texas Wastewater B license questions and
answers 2026\2027 A+ Grade

Motorhorsepower (MHP) x Motor Efficiency (ME%) =
- correct answer Motorhorsepower (MHP) x Motor Efficiency (ME%) = Brake horsepower (BHP) x Pump
Efficiency (PE%) = Water Horsepower (WHP)



In the contact stabilization system of activated sludge treatment, the detention time in the contact zone
is designed to be _____ other types of activated sludge treatment.
- correct answer shorter than



The definition of an oxygen deficient atmosphere is one that contains less than ____ percent oxygen
- correct answer 19.5



A combustible atmosphere:
- correct answer contains oxygen and flammable gas, vapor or dust



The sludge volume index (SVI) is:
- correct answer the volume of settled sludge (30mins) in ml/L times 1000 divided by the concentration
in mg/L of MLSS



Biomonitoring
- correct answer Involves the use of aquatic life to test the toxicity of a wastewater treatment plant
effluent.



30-min setteability test indicates
- correct answer clarity of effluent,



Proper operation of facultative pond system requires
- correct answer adequate DO be maintained at the surface at all times