Wastewater Treatment Class I Questions
and Answers Already Graded A
The first step the maintenance staff should take in properly locking and tagging out a piece of
equipment is to...
a) alert the operator on duty
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 ✔✔a) alert the operator on duty
Always alert the operator on duty before shutting down any equipment so as to prevent the
possibility of harming personnel or affecting process performance as a result of the shutdown.
When working in an area with two or more floor coverings, be sure that they are always...
,a) overlapping one another
b) secured together
c) separated from one another
d) at the entrances and exits only ✔✔b) secured together
If two or more floor coverings are required, secure them together to prevent trips and falls from
the coverings separating.
When manually lifting any object, be sure to...
a) hold it at arm's length
b) keep your back bent and hold it low
c) keep it close to your body and use leg strength
,d) keep your knees locked and bend at the waist ✔✔c) keep it close to your body and use leg
strength
When lifting any object manually, use your legs and keep the object close to to your body in
order to minimize the risk of back injury.
Oxygen deficiency becomes a concern when the oxygen level in a confined space is less than...
a) 19.5%
b) 22.5%
c) 25.5%
d) 28.5% ✔✔a) 19.5%
The quality of air in a confined space is of utmost importance. Ambient air contains
approximately 21% oxygen and atmospheres with oxygen concentrations below 19.5% are
, considered unsuitable for occupancy. Levels below 19.5% can lead to injury, loss of
consciousness or death.
Which of the following provides safety information for potentially hazardous or toxic materials?
a) CERCLA
b) OSHA
c) CFR
d) MSDS ✔✔d) MSDS
Material Safety Data Sheets provide information on chemical hazards, and health, safety and
environmental concerns of chemicals.
Conventional activated sludge systems typically operate with a DO range of...
a) 0-1 mg/L
and Answers Already Graded A
The first step the maintenance staff should take in properly locking and tagging out a piece of
equipment is to...
a) alert the operator on duty
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 ✔✔a) alert the operator on duty
Always alert the operator on duty before shutting down any equipment so as to prevent the
possibility of harming personnel or affecting process performance as a result of the shutdown.
When working in an area with two or more floor coverings, be sure that they are always...
,a) overlapping one another
b) secured together
c) separated from one another
d) at the entrances and exits only ✔✔b) secured together
If two or more floor coverings are required, secure them together to prevent trips and falls from
the coverings separating.
When manually lifting any object, be sure to...
a) hold it at arm's length
b) keep your back bent and hold it low
c) keep it close to your body and use leg strength
,d) keep your knees locked and bend at the waist ✔✔c) keep it close to your body and use leg
strength
When lifting any object manually, use your legs and keep the object close to to your body in
order to minimize the risk of back injury.
Oxygen deficiency becomes a concern when the oxygen level in a confined space is less than...
a) 19.5%
b) 22.5%
c) 25.5%
d) 28.5% ✔✔a) 19.5%
The quality of air in a confined space is of utmost importance. Ambient air contains
approximately 21% oxygen and atmospheres with oxygen concentrations below 19.5% are
, considered unsuitable for occupancy. Levels below 19.5% can lead to injury, loss of
consciousness or death.
Which of the following provides safety information for potentially hazardous or toxic materials?
a) CERCLA
b) OSHA
c) CFR
d) MSDS ✔✔d) MSDS
Material Safety Data Sheets provide information on chemical hazards, and health, safety and
environmental concerns of chemicals.
Conventional activated sludge systems typically operate with a DO range of...
a) 0-1 mg/L
