Wastewater Treatment Operator Certification Test #2 Questions with Verified Answers|
Latest Update Graded A+
During the day, what typically happens to a pond as a result of the algae?
A) Algae uses carbon dioxide, which raises pH
B) Algae produces carbon dioxide, which lowers pH
C) Algae consumes carbon dioxide, which lower pH
D) Algae releases carbon dioxide, which raises pH A) Algae uses carbon dioxide, which raises
pH (v.1 pg 299)
What should be done to find a small chlorine leak?
A) Spray hypocloric acid near the suspected leak
B) Tie a rag on a stick, dip the rag in a strong ammonia solution, and hold the rag near the
suspected points
C) Release carbon dioxide to trace the leak
D) Apply a small quantity of citric acid near the leak B) Tie a rag on a stick, dip the rag in a
strong ammonia solution, and hold the rag near the suspected points (v.1 pg 386)
What should you do if there is a thick, dark foam on the surface of an aeration tank?
A) Increase the sludge wasting
B) Decrease sludge wasting
C) Maintain current MLSS concentration
D) Increase the mircoorganism population A) Increase the sludge wasting (v.2 pg 53)
Why is mixing important in an anaerobic digester?
,A) Increases the build up of grit
B) Speeds up digestion rate
C) Achieves heterogeneous content in the digester
D) Forms a scum blanket B) Speeds up digestion rate (v.2 pg 176)
Where is the correct location for a vent inside a room storing chlorine gas?
A) 12 inches below the ceiling
B) At nose level
C) Within 12 inches of the floor
D) At the highest point in the room C) Within 12 inches of the floor (v.1 pg 396)
What is the purpose of the seal at the stuffing box in a pump?
A) Increases the discharge flowrate of the pump
B) Minimizes cavitation
C) Increases brake horsepower
D) Lubricates the packing D) Lubricates the packing (v.2 pg 344)
What is the incubation period for the BOD test?
A) Five days +/- 3 hours
B) Five days +/- 1 hours
C) Five days +/-4 hours
D) Five days +/- 2 hours A) Five days +/- 3 hours (v.2 pg 574)
What could happen if you are exposed to very high concentration of hydrogen sulfide?
, A) Swelling of the hand
B) Numbness of the legs
C) It could quickly lead to death
D) Develop skin rash C) It could quickly lead to death (v.2 pg 268)
What causes primary effluent to become black and odorous?
A) Excessive sludge pumping
B) Oil leak from the sludge pump
C) Crack in the launder
D) Improper sludge removal from the clarifier D) Improper sludge removal from the clarifier
(v.1 pg 123)
What is a biomass?
A) Bacteria that change ammonia into oxidized nitrogen
B) Organisms that grow in a thread or filamentous form
C) A mass of organic material consisting of living organisms that feed on the wastes in sewage
D) Wastes such as sand, salt, and calcium that are present in the plant influent C) A mass of
organic material consisting of living organisms that feed on the wastes in sewage (v.2 pg 816)
What is the color of a pond that is operating properly?
A) Brown
B) Deep green color
C) Clear
D) Tan B) Deep green color (v.1 pg 309)
Latest Update Graded A+
During the day, what typically happens to a pond as a result of the algae?
A) Algae uses carbon dioxide, which raises pH
B) Algae produces carbon dioxide, which lowers pH
C) Algae consumes carbon dioxide, which lower pH
D) Algae releases carbon dioxide, which raises pH A) Algae uses carbon dioxide, which raises
pH (v.1 pg 299)
What should be done to find a small chlorine leak?
A) Spray hypocloric acid near the suspected leak
B) Tie a rag on a stick, dip the rag in a strong ammonia solution, and hold the rag near the
suspected points
C) Release carbon dioxide to trace the leak
D) Apply a small quantity of citric acid near the leak B) Tie a rag on a stick, dip the rag in a
strong ammonia solution, and hold the rag near the suspected points (v.1 pg 386)
What should you do if there is a thick, dark foam on the surface of an aeration tank?
A) Increase the sludge wasting
B) Decrease sludge wasting
C) Maintain current MLSS concentration
D) Increase the mircoorganism population A) Increase the sludge wasting (v.2 pg 53)
Why is mixing important in an anaerobic digester?
,A) Increases the build up of grit
B) Speeds up digestion rate
C) Achieves heterogeneous content in the digester
D) Forms a scum blanket B) Speeds up digestion rate (v.2 pg 176)
Where is the correct location for a vent inside a room storing chlorine gas?
A) 12 inches below the ceiling
B) At nose level
C) Within 12 inches of the floor
D) At the highest point in the room C) Within 12 inches of the floor (v.1 pg 396)
What is the purpose of the seal at the stuffing box in a pump?
A) Increases the discharge flowrate of the pump
B) Minimizes cavitation
C) Increases brake horsepower
D) Lubricates the packing D) Lubricates the packing (v.2 pg 344)
What is the incubation period for the BOD test?
A) Five days +/- 3 hours
B) Five days +/- 1 hours
C) Five days +/-4 hours
D) Five days +/- 2 hours A) Five days +/- 3 hours (v.2 pg 574)
What could happen if you are exposed to very high concentration of hydrogen sulfide?
, A) Swelling of the hand
B) Numbness of the legs
C) It could quickly lead to death
D) Develop skin rash C) It could quickly lead to death (v.2 pg 268)
What causes primary effluent to become black and odorous?
A) Excessive sludge pumping
B) Oil leak from the sludge pump
C) Crack in the launder
D) Improper sludge removal from the clarifier D) Improper sludge removal from the clarifier
(v.1 pg 123)
What is a biomass?
A) Bacteria that change ammonia into oxidized nitrogen
B) Organisms that grow in a thread or filamentous form
C) A mass of organic material consisting of living organisms that feed on the wastes in sewage
D) Wastes such as sand, salt, and calcium that are present in the plant influent C) A mass of
organic material consisting of living organisms that feed on the wastes in sewage (v.2 pg 816)
What is the color of a pond that is operating properly?
A) Brown
B) Deep green color
C) Clear
D) Tan B) Deep green color (v.1 pg 309)
