Class 2 Wastewater Operator
Certification: Multiple-Choice Practice
Exam with Verified Answers|| MOST
RECENT!! [GOOD LUCK]
The threshold limit value
concentration for chlorine
vapour is:
a. 0.1 ppm
b. 0.3 ppm
c. 0.5 ppm
d. 1.0 ppm - ANSWERS-c. 0.5ppm
When working in confined spaces where flammable gasesmay be
present, use only tools made of:
a. stainless steel
b. lead
c. iron
d. a non-sparking alloy - ANSWERS-d. a non-sparking alloy
In addition to the worker entering a confined space, what is thw
minimum number of people required to be present during a confined
space entry?
a. 1
b. 2
c. 3
d. 4 - ANSWERS-a. 1
Hearing protection must be made available to all employees exposed to
noise levels above:
a. 85 db. averaged over 8 working hours
b. 850 db. averaged over 8 working hours
c. 85 db. continuously for 8 working hours
d. 85 db. at any point in the 8 hour workday - ANSWERS-a. 85 db
averaged over 8 working hours
Recommended hygiene practices to minimize the risk if being infected
by wastewater pathogens include:
, a. only rubbing your eyes while working if you are wearing impervious
gloves
b. washing your hands before the beginning of your shift
c. changing out your work clothes and showering before leaving work
d. reading the material safety data sheets for all chemicals used in the
plant - ANSWERS-c. changing out your work clothes and showering
before leaving work
the BOD loading rate divided by the quantity of microorganisms present
in the biological reactor (aeration tanks) is known as:
a. organic loading
b. toxicity
c. hydraulic loading
d. food to microorganism ratio - ANSWERS-d. food to microorganism
ratio
The food to microorganism ratio is the ratio of the mass of organic
loading to the mass of microorganisms in the biological reactors
white fluffy foam on the biological reactors in an activated sludge
process is usually caused by:
a. insufficient biomass to treat the incoming waste
B. Low b o d
C. high do
D. Too little sludge being waste from process - ANSWERS-a. insufficient
biomass to treat the incoming waste
Stiff white foam typically indicates that there are too few microorganisms
in the system to treat the incoming waste. This shortage can be caused
by start-up conditions, excessive wasting, toxic materials in the influent,
low do or other conditions harmful to the microorganism population.
typical components of grit removal systems include:
a. belt presses
b. comminutors
C chain and flights scrapers
D Bar racks - ANSWERS-C. chain and flight scrapers
the components of a great removal system will depend on the type used
at your facility. The components of the commonly used equipment
include chain and slight scrapers bucket elevators grip screws air
compressors and pumps / Airlift.
common settling times in primary clarifiers - ANSWERS-2-3 hours
what could be the problem when a centrifugal pump is not delivering
sufficient capacity? - ANSWERS-the suction line has been set up
incorrectly
what is the reason that would cause a pump to not deliver liquid at all? -
ANSWERS-pump is not primed or has lustrous prime
Certification: Multiple-Choice Practice
Exam with Verified Answers|| MOST
RECENT!! [GOOD LUCK]
The threshold limit value
concentration for chlorine
vapour is:
a. 0.1 ppm
b. 0.3 ppm
c. 0.5 ppm
d. 1.0 ppm - ANSWERS-c. 0.5ppm
When working in confined spaces where flammable gasesmay be
present, use only tools made of:
a. stainless steel
b. lead
c. iron
d. a non-sparking alloy - ANSWERS-d. a non-sparking alloy
In addition to the worker entering a confined space, what is thw
minimum number of people required to be present during a confined
space entry?
a. 1
b. 2
c. 3
d. 4 - ANSWERS-a. 1
Hearing protection must be made available to all employees exposed to
noise levels above:
a. 85 db. averaged over 8 working hours
b. 850 db. averaged over 8 working hours
c. 85 db. continuously for 8 working hours
d. 85 db. at any point in the 8 hour workday - ANSWERS-a. 85 db
averaged over 8 working hours
Recommended hygiene practices to minimize the risk if being infected
by wastewater pathogens include:
, a. only rubbing your eyes while working if you are wearing impervious
gloves
b. washing your hands before the beginning of your shift
c. changing out your work clothes and showering before leaving work
d. reading the material safety data sheets for all chemicals used in the
plant - ANSWERS-c. changing out your work clothes and showering
before leaving work
the BOD loading rate divided by the quantity of microorganisms present
in the biological reactor (aeration tanks) is known as:
a. organic loading
b. toxicity
c. hydraulic loading
d. food to microorganism ratio - ANSWERS-d. food to microorganism
ratio
The food to microorganism ratio is the ratio of the mass of organic
loading to the mass of microorganisms in the biological reactors
white fluffy foam on the biological reactors in an activated sludge
process is usually caused by:
a. insufficient biomass to treat the incoming waste
B. Low b o d
C. high do
D. Too little sludge being waste from process - ANSWERS-a. insufficient
biomass to treat the incoming waste
Stiff white foam typically indicates that there are too few microorganisms
in the system to treat the incoming waste. This shortage can be caused
by start-up conditions, excessive wasting, toxic materials in the influent,
low do or other conditions harmful to the microorganism population.
typical components of grit removal systems include:
a. belt presses
b. comminutors
C chain and flights scrapers
D Bar racks - ANSWERS-C. chain and flight scrapers
the components of a great removal system will depend on the type used
at your facility. The components of the commonly used equipment
include chain and slight scrapers bucket elevators grip screws air
compressors and pumps / Airlift.
common settling times in primary clarifiers - ANSWERS-2-3 hours
what could be the problem when a centrifugal pump is not delivering
sufficient capacity? - ANSWERS-the suction line has been set up
incorrectly
what is the reason that would cause a pump to not deliver liquid at all? -
ANSWERS-pump is not primed or has lustrous prime
