CA Wastewater Grade 3/ 63 Sample
Questions/ 2024-2025.
When operating an aerobic digester be sure to keep the feed sludge
volatile solid concentration high or else the percent reduction will decrease -
Answer: F
Any sample can be "fixed" for later testing. - Answer: F
The nice thing about anaerobic process is the operator can smoke
since no oxygen is present for a fire to start. - Answer: F
Dissolved oxygen in an aeration tank should be at a minimum of 1 ppm
for biological nitrification - Answer: T
Page 1 of 20
,Nitrification is the process where by ammonia is converted to nitrogen
gas. - Answer: F
In order for nitrification to occur you must have an anaerobic process - Answer: F
Chlorine is lighter than air and will collect on the ceiling if a leak occurs. - Answer:
F
A complete-mix activated sludge basin is normally square allowing
complete MLSS mixing. - Answer: T
Blanks are used in the BOD test to calculate dilution water DO uptake - Answer: T
Flexible piping sometimes called a pigtail should connect a chlorine
container to stationary piping. - Answer: T
Carbon dioxide will lower the pH of water. - Answer: T
When chlorine gas combines with moisture in the air it forms
hydrochloric gas. - Answer: T
A high hydrogen sulfide gas concentration is required before your
sense of smell will be dulled. - Answer: F
Page 2 of 20
, Alkalinity is the key control for an activated sludge basin. - Answer: F
30 days is normally required for anaerobic digestion - Answer: T
The first sign that an anaerobic digester is becoming sick is normally
A. a pH change.
B. a decrease in gas production.
C. a change in the volatile acid/alkalinity relationship.
D. an increase in the amount of hydrogen sulfide gas.
E. a temperature change. - Answer: C
In order for a pond to be functioning correctly________ must be taking
place.
A. photosynthesis
B. rapid temperature changes
C. rapid pH changes
D. rapid DO changes
E. alkalinity changes - Answer: A
Potential problems of ammonia in wastewater.
A. ammonia toxicity to fish.
B. DO depletion in the receiving waters.
C. Increase algae growth.
D. Blue baby.
E. All the above - Answer: E
Page 3 of 20
Questions/ 2024-2025.
When operating an aerobic digester be sure to keep the feed sludge
volatile solid concentration high or else the percent reduction will decrease -
Answer: F
Any sample can be "fixed" for later testing. - Answer: F
The nice thing about anaerobic process is the operator can smoke
since no oxygen is present for a fire to start. - Answer: F
Dissolved oxygen in an aeration tank should be at a minimum of 1 ppm
for biological nitrification - Answer: T
Page 1 of 20
,Nitrification is the process where by ammonia is converted to nitrogen
gas. - Answer: F
In order for nitrification to occur you must have an anaerobic process - Answer: F
Chlorine is lighter than air and will collect on the ceiling if a leak occurs. - Answer:
F
A complete-mix activated sludge basin is normally square allowing
complete MLSS mixing. - Answer: T
Blanks are used in the BOD test to calculate dilution water DO uptake - Answer: T
Flexible piping sometimes called a pigtail should connect a chlorine
container to stationary piping. - Answer: T
Carbon dioxide will lower the pH of water. - Answer: T
When chlorine gas combines with moisture in the air it forms
hydrochloric gas. - Answer: T
A high hydrogen sulfide gas concentration is required before your
sense of smell will be dulled. - Answer: F
Page 2 of 20
, Alkalinity is the key control for an activated sludge basin. - Answer: F
30 days is normally required for anaerobic digestion - Answer: T
The first sign that an anaerobic digester is becoming sick is normally
A. a pH change.
B. a decrease in gas production.
C. a change in the volatile acid/alkalinity relationship.
D. an increase in the amount of hydrogen sulfide gas.
E. a temperature change. - Answer: C
In order for a pond to be functioning correctly________ must be taking
place.
A. photosynthesis
B. rapid temperature changes
C. rapid pH changes
D. rapid DO changes
E. alkalinity changes - Answer: A
Potential problems of ammonia in wastewater.
A. ammonia toxicity to fish.
B. DO depletion in the receiving waters.
C. Increase algae growth.
D. Blue baby.
E. All the above - Answer: E
Page 3 of 20
