WASTE WATER GRADE 1 |3 DIFFERENT
VERSIONS PRACTICE EXAMINATION 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ When the operating crew is to change a one ton chlorine cylinder, safety
equipment should include a self-contained breathing apparatus and ammonia
water solution..
Answer: True
◍ The withdrawal of sludge from a clarifier should be slow in order to:.
Answer: prevent the pulling of too much water with the sludge.
◍ To qualify for the Grade I Operator exam, a candidate must have a college
degree and one year of experience performing the functions of a wastewater
treatment plant operator..
Answer: False
◍ When a digester is not being mixed, normally the solids settle to the bottom,
leaving a liquid above the sludge known as:.
Answer: supernatant.
◍ The total solids in wastewater would be a combination of:.
Answer: dissolved solids and suspended solids.
◍ The desired pH for a stable anaerobic digester is in the range of 6.8 to 7.2 p
H. .
Answer: True
◍ Identification of potentially unsafe working conditions is the responsibility
of:.
Answer: All of the above.
◍ Proper analysis of representative samples is the only conclusive method of
, measuring the efficiency of a treatment process..
Answer: True
◍ In wastewater treatment facilities, cross connections are:.
Answer: None of the above.
◍ Prior to working in a drained anaerobic digester, confined space entry
permits must be prepared..
Answer: True
◍ An applicant who engages in dishonest conduct during an examination shall
have his or her examination materials confiscated,shall not have the
examinationgraded, and shall be denied the opportunity to take the next
scheduled examination..
Answer: True
◍ All 100- and 150-pound chlorine cylinders should be restrained or
safety-chained to sturdy supports even when empty, except when actually
being moved to or from storage..
Answer: True
◍ When a facultative pond develops a green appearance, it should be treated
with copper sulfate to kill off the algae..
Answer: False
◍ Magnetic flow meters are installed on iron pipes where installation of other
types of flow meters would otherwise be difficult or impossible..
Answer: False
◍ The main function of launders in a rectangular sedimentation tank is to
prevent scum and other floatables from leaving with theprimary effluent..
Answer: False
◍ When wastewater enters a rectangular clarifier, it is often evenly dispersed
across the entire width of the tank by means of:.
Answer: a baffle.
◍ "Chlorine residual" refers to:.
, Answer: the chlorine remaining after disinfection.
◍ Worn wearing shoes are often found on:.
Answer: the flights of a rectangular clarifier.
◍ Pump station wet wells may be considered confined spaces due to:.
Answer: potential for explosive, toxic, orsuffocating atmosphere.
◍ A well-operated primary clarifier, when it is not overloaded, will remove
between 90 and 95 percent of the influent settleable solids..
Answer: True
◍ The main function of algae in a facultative wastewater treatment pond is to:.
Answer: produce oxygen during daylight hours.
◍ The best time of the year to initiate operation of a new facultative pond is
during the coldest months of the year..
Answer: False
◍ Hydrogen sulfide, in addition to creating an odor nuisance, can be an
explosion hazard when mixed with air in certain concentrations..
Answer: True
◍ In most treatment plants, the wastewater flows out of the primary clarifier
into anotherunit where it receives biological or:.
Answer: secondary treatment.
◍ Normally, packing gland nuts on older centrifugal pumps should be adjusted
to prevent any leakage of liquid from the pump..
Answer: True
◍ Surface thermometers are used to indicate problems with water seals on
large pumps..
Answer: False
◍ Doppler meters are used to measure the settling velocity of sludge in gravity
thickeners..
Answer: False
VERSIONS PRACTICE EXAMINATION 2026
QUESTIONS WITH ANSWERS GRADED A+
◍ When the operating crew is to change a one ton chlorine cylinder, safety
equipment should include a self-contained breathing apparatus and ammonia
water solution..
Answer: True
◍ The withdrawal of sludge from a clarifier should be slow in order to:.
Answer: prevent the pulling of too much water with the sludge.
◍ To qualify for the Grade I Operator exam, a candidate must have a college
degree and one year of experience performing the functions of a wastewater
treatment plant operator..
Answer: False
◍ When a digester is not being mixed, normally the solids settle to the bottom,
leaving a liquid above the sludge known as:.
Answer: supernatant.
◍ The total solids in wastewater would be a combination of:.
Answer: dissolved solids and suspended solids.
◍ The desired pH for a stable anaerobic digester is in the range of 6.8 to 7.2 p
H. .
Answer: True
◍ Identification of potentially unsafe working conditions is the responsibility
of:.
Answer: All of the above.
◍ Proper analysis of representative samples is the only conclusive method of
, measuring the efficiency of a treatment process..
Answer: True
◍ In wastewater treatment facilities, cross connections are:.
Answer: None of the above.
◍ Prior to working in a drained anaerobic digester, confined space entry
permits must be prepared..
Answer: True
◍ An applicant who engages in dishonest conduct during an examination shall
have his or her examination materials confiscated,shall not have the
examinationgraded, and shall be denied the opportunity to take the next
scheduled examination..
Answer: True
◍ All 100- and 150-pound chlorine cylinders should be restrained or
safety-chained to sturdy supports even when empty, except when actually
being moved to or from storage..
Answer: True
◍ When a facultative pond develops a green appearance, it should be treated
with copper sulfate to kill off the algae..
Answer: False
◍ Magnetic flow meters are installed on iron pipes where installation of other
types of flow meters would otherwise be difficult or impossible..
Answer: False
◍ The main function of launders in a rectangular sedimentation tank is to
prevent scum and other floatables from leaving with theprimary effluent..
Answer: False
◍ When wastewater enters a rectangular clarifier, it is often evenly dispersed
across the entire width of the tank by means of:.
Answer: a baffle.
◍ "Chlorine residual" refers to:.
, Answer: the chlorine remaining after disinfection.
◍ Worn wearing shoes are often found on:.
Answer: the flights of a rectangular clarifier.
◍ Pump station wet wells may be considered confined spaces due to:.
Answer: potential for explosive, toxic, orsuffocating atmosphere.
◍ A well-operated primary clarifier, when it is not overloaded, will remove
between 90 and 95 percent of the influent settleable solids..
Answer: True
◍ The main function of algae in a facultative wastewater treatment pond is to:.
Answer: produce oxygen during daylight hours.
◍ The best time of the year to initiate operation of a new facultative pond is
during the coldest months of the year..
Answer: False
◍ Hydrogen sulfide, in addition to creating an odor nuisance, can be an
explosion hazard when mixed with air in certain concentrations..
Answer: True
◍ In most treatment plants, the wastewater flows out of the primary clarifier
into anotherunit where it receives biological or:.
Answer: secondary treatment.
◍ Normally, packing gland nuts on older centrifugal pumps should be adjusted
to prevent any leakage of liquid from the pump..
Answer: True
◍ Surface thermometers are used to indicate problems with water seals on
large pumps..
Answer: False
◍ Doppler meters are used to measure the settling velocity of sludge in gravity
thickeners..
Answer: False
