Wastewater Class 2 multiple choice
Study online at https://quizlet.com/_48k71n
1. The threahold limit value concentration for c. 0.5ppm
chlorine vapour is:
a. 0.1 ppm
b. 0.3 ppm
c. 0.5 ppm
d. 1.0 ppm
2. When working in confined spaces where d. a non-sparking alloy
flammable gasesmay be present, use only
tools made of:
a. stainless steel
b. lead
c. iron
d. a non-sparking alloy
3. In addition to the worker entering a confined a. 1
space, what is thw minimum number of peo-
ple required to be present during a confined
space entry?
a. 1
b. 2
c. 3
d. 4
4. Hearing protection must be made available a. 85 db averaged over 8 working hours
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
, Wastewater Class 2 multiple choice
Study online at https://quizlet.com/_48k71n
5. Recommended hygiene practices to mini- c. changing out your work clothes and
mize the risk if being infected by wastewater showering before leaving work
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 show-
ering before leaving work
d. reading the material safety data sheets for
all chemicals used in the plant
6. the BOD loading rate divided by the quantity d. food to microorganism ratio
of microorganisms present in the biological
reactor (aeration tanks) is known as: The food to microorganism ratio is the
a. organic loading ratio of the mass of organic loading to
b. toxicity the mass of microorganisms in the bio-
c. hydraulic loading logical reactors
d. food to microorganism ratio
7. white fluffy foam on the biological reactors in a. insufficient biomass to treat the in-
an activated sludge process is usually caused coming waste
by: Stiff white foam typically indicates that
a. insufficient biomass to treat the incoming there are too few microorganisms in
waste the system to treat the incoming waste.
B. Low b o d This shortage can be caused by start-up
C. high do conditions, excessive wasting, toxic ma-
D. Too little sludge being waste from process terials in the influent, low do or other
conditions harmful to the microorgan-
ism population.
8.
Study online at https://quizlet.com/_48k71n
1. The threahold limit value concentration for c. 0.5ppm
chlorine vapour is:
a. 0.1 ppm
b. 0.3 ppm
c. 0.5 ppm
d. 1.0 ppm
2. When working in confined spaces where d. a non-sparking alloy
flammable gasesmay be present, use only
tools made of:
a. stainless steel
b. lead
c. iron
d. a non-sparking alloy
3. In addition to the worker entering a confined a. 1
space, what is thw minimum number of peo-
ple required to be present during a confined
space entry?
a. 1
b. 2
c. 3
d. 4
4. Hearing protection must be made available a. 85 db averaged over 8 working hours
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
, Wastewater Class 2 multiple choice
Study online at https://quizlet.com/_48k71n
5. Recommended hygiene practices to mini- c. changing out your work clothes and
mize the risk if being infected by wastewater showering before leaving work
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 show-
ering before leaving work
d. reading the material safety data sheets for
all chemicals used in the plant
6. the BOD loading rate divided by the quantity d. food to microorganism ratio
of microorganisms present in the biological
reactor (aeration tanks) is known as: The food to microorganism ratio is the
a. organic loading ratio of the mass of organic loading to
b. toxicity the mass of microorganisms in the bio-
c. hydraulic loading logical reactors
d. food to microorganism ratio
7. white fluffy foam on the biological reactors in a. insufficient biomass to treat the in-
an activated sludge process is usually caused coming waste
by: Stiff white foam typically indicates that
a. insufficient biomass to treat the incoming there are too few microorganisms in
waste the system to treat the incoming waste.
B. Low b o d This shortage can be caused by start-up
C. high do conditions, excessive wasting, toxic ma-
D. Too little sludge being waste from process terials in the influent, low do or other
conditions harmful to the microorgan-
ism population.
8.
