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2024 WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 4 EXAM WITH CORRECT ANSWERS
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2024 WASTEWATER TREATMENT OPERATOR CERTIFICATION TEST 4 EXAM WITH CORRECT ANSWERS
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2024 WASTEWATER TREATMENTOPERATOR CERTIFICATION TEST 4
EXAM WITH CORRECT ANSWERS
What is usually the last indicator to change in an anaerobic digester that is
becoming sour?
A) Volatile acid/alkalinity ratio
B) Temperature
C) Color
D) pH - CORRECT-ANSWERSD) pH (v.2 pg 192)
What information is needed to calculate the F/M ratio?
A) BOD and MLSS
B) BOD and MLVSS
C) TSS and MLSS
D) MLSS and settled sludge volume - CORRECT-ANSWERSB) BOD and MLVSS
(v.2 pg 16)
Which chemical is commonly used to control hydrogen sulfide gas?
A) Chlorine
B) Ammonia
C) Carbon dioxide
D) Sodium dioxide - CORRECT-ANSWERSA) Chlorine (v.2 pg 506)
What could cause a trickling filter to operate less effectively?
A) Blower inefficiency
B) Recirculation
C) Plastic Media
D) Ponding - CORRECT-ANSWERSD) Ponding (v.1 pg 175)
What is MPN?
A) A type of surfactant found in wastewater
B) A clump of organic material
C) Most Probable Number of coliform group organisms per unit volume of
sample water
, D) A number that indicates the tendency of activated sludge solids to thicken
- CORRECT-ANSWERSC) Most Probable Number of coliform group organisms
per unit volume of sample water (v.2 pg 835)
What is true regarding dissolved solids?
A) They will get caught on a filter
B) They are often called colloidal particles
C) They will pass through a filter
D) They are all inorganic solids - CORRECT-ANSWERSC) They will pass
through a filter (v.1 pg 21)
Why is chlorine sometimes added at the headworks of the plant?
A) To address denitrification
B) Control odor
C) To address sludge bulking
D) Control fly problems - CORRECT-ANSWERSB) Control odor (v.1 pg 354)
What is the purpose of a launder in a primary clarifier?
A) Collects the primary effluent that flows over the weir and conveys it
towards the next treatment process
B) A pipe that conveys wastewater to the influent of the clarifier
C) Blades that scrape sludge from the bottom of the clarifier to the sump
D) A power unit that rotates the collector - CORRECT-ANSWERSA) Collects
the primary effluent that flows over the weir and conveys it towards the next
treatment process (v.1 pg 115)
What is the best way to communicate important information to employees?
A) Memo
B) Meeting in-person
C) Bulletin board in break room
D) Send an email - CORRECT-ANSWERSB) Meeting in-person (v.2 pg 708-
710)
What problems might arise from tightening a gland in a pump?
A) Excessive leakage
B) Water hammer
C) Wear on the shaft or shaft sleeve
D) Cavitation - CORRECT-ANSWERSC) Wear on the shaft or shaft sleeve (v.2
pg 344)
What could the oxygen uptake rate test be used for?
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