Wastewater Treatment Class I
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1. a) alert the operator on duty The first step the maintenance staff
should take in properly locking and tag-
Always alert the operator on duty before shut- ging out a piece of equipment is to...
ting down any equipment so as to prevent the
possibility of harming personnel or affecting a) alert the operator on duty
process performance as a result of the shut-
down. b) turn the equipment off at the motor
control center (MCC)
c) pull the switch on the electrical panel
to "OFF"
d) fill out the tags
2. b) secured together When working in an area with two or
more floor coverings, be sure that they
If two or more floor coverings are required, are always...
secure them together to prevent trips and
falls from the coverings separating. a) overlapping one another
b) secured together
c) separated from one another
d) at the entrances and exits only
3. c) keep it close to your body and use leg When manually lifting any object, be
strength sure to...
When lifting any object manually, use your a) hold it at arm's length
legs and keep the object close to to your body
in order to minimize the risk of back injury. b) keep your back bent and hold it low
c) keep it close to your body and use leg
, Wastewater Treatment Class I
Study online at https://quizlet.com/_g7ns1c
strength
d) keep your knees locked and bend at
the waist
4. a) 19.5% Oxygen deficiency becomes a concern
when the oxygen level in a confined
The quality of air in a confined space is of space is less than...
utmost importance. Ambient air contains ap-
proximately 21% oxygen and atmospheres a) 19.5%
with oxygen concentrations below 19.5% are
considered unsuitable for occupancy. Levels b) 22.5%
below 19.5% can lead to injury, loss of con-
c) 25.5%
sciousness or death.
d) 28.5%
5. d) MSDS Which of the following provides safety
information for potentially hazardous or
Material Safety Data Sheets provide informa- toxic materials?
tion on chemical hazards, and health, safety
and environmental concerns of chemicals. a) CERCLA
b) OSHA
c) CFR
d) MSDS
6. b) 2-5 mg/L Conventional activated sludge systems
typically operate with a DO range of...
While many facilities operate in a range of 1-4
mg/L, the optimum range of DO for a conven- a) 0-1 mg/L
tional activated sludge facility is 2-5 mg/L
, Wastewater Treatment Class I
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b) 2-5 mg/L
c) 4-7 mg/L
d) 7-9 mg/L
7. a) screenings Large debris (sticks, rocks, etc), large
floating solids, and fibrous materials
Large debris, large floating solid materi- (rags, strings, cloths, etc.) are catego-
al, and fibrous material are categorized as rized as...
screenings. It is necessary to remove this
material before the wastewater reaches any a) screenings
pumps or equipment in order to prevent dam-
age. b) scum
c) grit
d) floc
8. b) centrifugal Pumps are often required to bring
wastewater into a treatment plant. What
Centrifugal pumps are primarily used for types of pumps are typically used to lift
transporting influent and effluent waste- influent wastewater?
water. Positive-displacement pumps, such as
a progressing cavity pump, are used to trans- a) air-lift
port sludge.
b) centrifugal
c) positive displacement
d) progressing cavity
9. a) detention time The time it takes for a unit volume of
wastewater to pass entirely through a
Study online at https://quizlet.com/_g7ns1c
1. a) alert the operator on duty The first step the maintenance staff
should take in properly locking and tag-
Always alert the operator on duty before shut- ging out a piece of equipment is to...
ting down any equipment so as to prevent the
possibility of harming personnel or affecting a) alert the operator on duty
process performance as a result of the shut-
down. b) turn the equipment off at the motor
control center (MCC)
c) pull the switch on the electrical panel
to "OFF"
d) fill out the tags
2. b) secured together When working in an area with two or
more floor coverings, be sure that they
If two or more floor coverings are required, are always...
secure them together to prevent trips and
falls from the coverings separating. a) overlapping one another
b) secured together
c) separated from one another
d) at the entrances and exits only
3. c) keep it close to your body and use leg When manually lifting any object, be
strength sure to...
When lifting any object manually, use your a) hold it at arm's length
legs and keep the object close to to your body
in order to minimize the risk of back injury. b) keep your back bent and hold it low
c) keep it close to your body and use leg
, Wastewater Treatment Class I
Study online at https://quizlet.com/_g7ns1c
strength
d) keep your knees locked and bend at
the waist
4. a) 19.5% Oxygen deficiency becomes a concern
when the oxygen level in a confined
The quality of air in a confined space is of space is less than...
utmost importance. Ambient air contains ap-
proximately 21% oxygen and atmospheres a) 19.5%
with oxygen concentrations below 19.5% are
considered unsuitable for occupancy. Levels b) 22.5%
below 19.5% can lead to injury, loss of con-
c) 25.5%
sciousness or death.
d) 28.5%
5. d) MSDS Which of the following provides safety
information for potentially hazardous or
Material Safety Data Sheets provide informa- toxic materials?
tion on chemical hazards, and health, safety
and environmental concerns of chemicals. a) CERCLA
b) OSHA
c) CFR
d) MSDS
6. b) 2-5 mg/L Conventional activated sludge systems
typically operate with a DO range of...
While many facilities operate in a range of 1-4
mg/L, the optimum range of DO for a conven- a) 0-1 mg/L
tional activated sludge facility is 2-5 mg/L
, Wastewater Treatment Class I
Study online at https://quizlet.com/_g7ns1c
b) 2-5 mg/L
c) 4-7 mg/L
d) 7-9 mg/L
7. a) screenings Large debris (sticks, rocks, etc), large
floating solids, and fibrous materials
Large debris, large floating solid materi- (rags, strings, cloths, etc.) are catego-
al, and fibrous material are categorized as rized as...
screenings. It is necessary to remove this
material before the wastewater reaches any a) screenings
pumps or equipment in order to prevent dam-
age. b) scum
c) grit
d) floc
8. b) centrifugal Pumps are often required to bring
wastewater into a treatment plant. What
Centrifugal pumps are primarily used for types of pumps are typically used to lift
transporting influent and effluent waste- influent wastewater?
water. Positive-displacement pumps, such as
a progressing cavity pump, are used to trans- a) air-lift
port sludge.
b) centrifugal
c) positive displacement
d) progressing cavity
9. a) detention time The time it takes for a unit volume of
wastewater to pass entirely through a
