OTCO Class 1 Wastewater Test NEWEST 2026-2027
ACTUAL EXAM COMPLETE 50 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A+ BRAND
NEW!!
A centrifugal pump is not discharging properly, what could be the problem? - CORRECT
ANSWER: Air leaks, speed to low, and/or damaged impeller
A mixture of activated sludge and wastewater is called? - CORRECT ANSWER: Mixed liquor
A test that provides the relative measure of the amount of food available to the biological system,
the degree of stabilization of the wastewater, and the effect of the effluent on the receiving
stream is called? - CORRECT ANSWER: Biochemical oxygen demand
All activated sludge processes must gave a system to remove excess microorganisms. What is the
name of this system? - CORRECT ANSWER: Waste activated sludge
An operator monitors the treatment process for parameters found in the? - CORRECT
ANSWER: NPDES permit
Anaerobic decomposition of wastewater produces? - CORRECT ANSWER: Hydrogen sulfide
As the temperature ????? Microorganisms accelerate consumption of Organics - CORRECT
ANSWER: Increases
Complete mix, step aeration, and contact stabilization are modifications of what process? -
CORRECT ANSWER: Activated sludge
, Disease causing organisms are called? - CORRECT ANSWER: Pathogens
Disinfection of WWTP effluent ???? Or ????? Pathogenic bacteria, viruses, and amoebic cysts
commonly found in wastewater. - CORRECT ANSWER: Inactivates or destroys
Grab samples taken in sizes that correspond to the flow rate are known as? - CORRECT
ANSWER: Flow proportional
Head is a measure of pressure always expressed in? - CORRECT ANSWER: Feet
In the formula Q=V(A), Q is defined as rate of flow expressed as? - CORRECT ANSWER: Cu.
Ft. / sec.
Liquid waste collected from residential, commercial, and industrial areas and conveyed to a
central location is generally called? - CORRECT ANSWER: Wastewater
Low solids in the return sludge could be an indication of? - CORRECT ANSWER: Excessive
wasting
MCRT is used to indicate when activated sludge should be? - CORRECT ANSWER: Wasted
MSDS stands for? - CORRECT ANSWER: Material Safety Data Sheet
Municipal wastewater consists of approximately what percentage of water? - CORRECT
ANSWER: 99.9%
Nitrification is the conversion of? - CORRECT ANSWER: Ammonia to nitrate
On a pump curve, as the head ?????, output ????? - CORRECT ANSWER: Increases, decreases
ACTUAL EXAM COMPLETE 50 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) ALREADY GRADED A+ BRAND
NEW!!
A centrifugal pump is not discharging properly, what could be the problem? - CORRECT
ANSWER: Air leaks, speed to low, and/or damaged impeller
A mixture of activated sludge and wastewater is called? - CORRECT ANSWER: Mixed liquor
A test that provides the relative measure of the amount of food available to the biological system,
the degree of stabilization of the wastewater, and the effect of the effluent on the receiving
stream is called? - CORRECT ANSWER: Biochemical oxygen demand
All activated sludge processes must gave a system to remove excess microorganisms. What is the
name of this system? - CORRECT ANSWER: Waste activated sludge
An operator monitors the treatment process for parameters found in the? - CORRECT
ANSWER: NPDES permit
Anaerobic decomposition of wastewater produces? - CORRECT ANSWER: Hydrogen sulfide
As the temperature ????? Microorganisms accelerate consumption of Organics - CORRECT
ANSWER: Increases
Complete mix, step aeration, and contact stabilization are modifications of what process? -
CORRECT ANSWER: Activated sludge
, Disease causing organisms are called? - CORRECT ANSWER: Pathogens
Disinfection of WWTP effluent ???? Or ????? Pathogenic bacteria, viruses, and amoebic cysts
commonly found in wastewater. - CORRECT ANSWER: Inactivates or destroys
Grab samples taken in sizes that correspond to the flow rate are known as? - CORRECT
ANSWER: Flow proportional
Head is a measure of pressure always expressed in? - CORRECT ANSWER: Feet
In the formula Q=V(A), Q is defined as rate of flow expressed as? - CORRECT ANSWER: Cu.
Ft. / sec.
Liquid waste collected from residential, commercial, and industrial areas and conveyed to a
central location is generally called? - CORRECT ANSWER: Wastewater
Low solids in the return sludge could be an indication of? - CORRECT ANSWER: Excessive
wasting
MCRT is used to indicate when activated sludge should be? - CORRECT ANSWER: Wasted
MSDS stands for? - CORRECT ANSWER: Material Safety Data Sheet
Municipal wastewater consists of approximately what percentage of water? - CORRECT
ANSWER: 99.9%
Nitrification is the conversion of? - CORRECT ANSWER: Ammonia to nitrate
On a pump curve, as the head ?????, output ????? - CORRECT ANSWER: Increases, decreases
