TEXAS WASTEWATER CLASS B NEWEST ACTUAL EXAM
The threahold limit value concentration for chlorine vapour is:
a. 0.1 ppm
b. 0.3 ppm
c. 0.5 ppm
d. 1.0 ppm - ANSWER: 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 - ANSWER: 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 - ANSWER: 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 - ANSWER: 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 -
ANSWER: 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 - ANSWER: 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 - ANSWER: 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 - ANSWER: 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 - ANSWER: 2-3 hours
what could be the problem when a centrifugal pump is not delivering sufficient
capacity? - ANSWER: the suction line has been set up incorrectly
what is the reason that would cause a pump to not deliver liquid at all? - ANSWER:
pump is not primed or has lostvots prime
during morning checks you notice taht the bearings in the pump are running hot.
what can cause this? - ANSWER: the bearings are over lubricated
over time you have noticed that thw packing in a pump requires frequent
replacement. what can be the cause? - ANSWER: there is insufficient seal
Operator checks state that the pump at the highlift building is excessively leaking out
of the stuffing box. What could be the source of the problem? - ANSWER: Stuffing
box is improperly packed
You have noticed the following when a centrifugal pump is operating: vibration,
heat, excessive noise and no flow. What could be causing these conditions? -
ANSWER: The pump is cavitating
Under the Environmental Protection Act (EPA), to whom is notification of a spill
required? - ANSWER: Ministry of the Environment
The threahold limit value concentration for chlorine vapour is:
a. 0.1 ppm
b. 0.3 ppm
c. 0.5 ppm
d. 1.0 ppm - ANSWER: 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 - ANSWER: 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 - ANSWER: 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 - ANSWER: 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 -
ANSWER: 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 - ANSWER: 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 - ANSWER: 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 - ANSWER: 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 - ANSWER: 2-3 hours
what could be the problem when a centrifugal pump is not delivering sufficient
capacity? - ANSWER: the suction line has been set up incorrectly
what is the reason that would cause a pump to not deliver liquid at all? - ANSWER:
pump is not primed or has lostvots prime
during morning checks you notice taht the bearings in the pump are running hot.
what can cause this? - ANSWER: the bearings are over lubricated
over time you have noticed that thw packing in a pump requires frequent
replacement. what can be the cause? - ANSWER: there is insufficient seal
Operator checks state that the pump at the highlift building is excessively leaking out
of the stuffing box. What could be the source of the problem? - ANSWER: Stuffing
box is improperly packed
You have noticed the following when a centrifugal pump is operating: vibration,
heat, excessive noise and no flow. What could be causing these conditions? -
ANSWER: The pump is cavitating
Under the Environmental Protection Act (EPA), to whom is notification of a spill
required? - ANSWER: Ministry of the Environment
