Page 1 of 68
WATER TREATMENT GRADE 4 EXAM PREP |
FREQUENTLY TESTED QUESTIONS WITH
CORRECT ANSWERS | BRAND NEW!
A direct water connection to a high hazard chemical feeder must
be protected by a
a.) Reduced pressure zone back flow prevention valve assembly
b.) Single check valve assembly
c.) Dual check valve assembly
d.) Double check valve assembly - ✔✔✔ Correct Answer > A
Which of the following describes the best way to correct a 3-
phase, 220 volt electric motor that is running in the wrong
direction after it was been installed?
A.) Check the ground wire
B.) Check the motor starter
C.) Reverse the connection of any two motor leads
,Page 2 of 68
D.) Send the engine back to the motor repair shop to be rewound
properly - ✔✔✔ Correct Answer > C
Why is it important to flush out a newly installed back flow
prevention device before testing?
a.) Allow water to flow in both directions through the unit
b.) Equalize the pressure throughout the system
c.) Rid the unit of corrosive chemicals
d.) Rid the unit of foreign objects and particles - ✔✔✔ Correct Answer
>D
A tracer added to the clarifier influent is first detected in the
effluent in 15 minutes and has completely passed through the
tank in 45 minutes. What does this indicate?
a.) Settling in this tank must be exceptionally good
b.) The tank is too large for the flow being treated
c.) This test has little or no meaning
d.) Flow is passing through the tank too quickly - ✔✔✔ Correct Answer
>D
,Page 3 of 68
Which of the following best describes the drop in output of UV
lamps?
a.) The largest drop in output is within the first year of operation
b.) Output loss is linear, approximately 20% per year
c.) Output is constant until failure
d.) Lamps lose the majority of their output in the last year of
operation - ✔✔✔ Correct Answer > A
What does Normal refer to when associated with a reagent?
a.) Gram equivalent weight of the reagent
b.) Molecular weight of the reagent
c.) Purity of the chemicals
d.) Reagent usually used - ✔✔✔ Correct Answer > B
What is the MCL for fluoride to prevent health hazards in drinking
water?
a.) 1.0 mg/L
b.) 2.0 mg/L
c.) 3.0 mg/L
, Page 4 of 68
d.) 4.0 mg/L - ✔✔✔ Correct Answer > D
In a DAF unit, the sludge that accumulates on the surface is
called
a.) Float
b.) Sediment
c.) Scrape
d.) Slurry - ✔✔✔ Correct Answer > A
What minimum positive pressure are all community water
systems required to operate and maintain throughout their
distribution systems?
a.) 10 psi
b.) 15 psi
c.) 20 psi
d.) 30 psi - ✔✔✔ Correct Answer > C
Which of the following is the best means of controlling fire in
activated carbon?
WATER TREATMENT GRADE 4 EXAM PREP |
FREQUENTLY TESTED QUESTIONS WITH
CORRECT ANSWERS | BRAND NEW!
A direct water connection to a high hazard chemical feeder must
be protected by a
a.) Reduced pressure zone back flow prevention valve assembly
b.) Single check valve assembly
c.) Dual check valve assembly
d.) Double check valve assembly - ✔✔✔ Correct Answer > A
Which of the following describes the best way to correct a 3-
phase, 220 volt electric motor that is running in the wrong
direction after it was been installed?
A.) Check the ground wire
B.) Check the motor starter
C.) Reverse the connection of any two motor leads
,Page 2 of 68
D.) Send the engine back to the motor repair shop to be rewound
properly - ✔✔✔ Correct Answer > C
Why is it important to flush out a newly installed back flow
prevention device before testing?
a.) Allow water to flow in both directions through the unit
b.) Equalize the pressure throughout the system
c.) Rid the unit of corrosive chemicals
d.) Rid the unit of foreign objects and particles - ✔✔✔ Correct Answer
>D
A tracer added to the clarifier influent is first detected in the
effluent in 15 minutes and has completely passed through the
tank in 45 minutes. What does this indicate?
a.) Settling in this tank must be exceptionally good
b.) The tank is too large for the flow being treated
c.) This test has little or no meaning
d.) Flow is passing through the tank too quickly - ✔✔✔ Correct Answer
>D
,Page 3 of 68
Which of the following best describes the drop in output of UV
lamps?
a.) The largest drop in output is within the first year of operation
b.) Output loss is linear, approximately 20% per year
c.) Output is constant until failure
d.) Lamps lose the majority of their output in the last year of
operation - ✔✔✔ Correct Answer > A
What does Normal refer to when associated with a reagent?
a.) Gram equivalent weight of the reagent
b.) Molecular weight of the reagent
c.) Purity of the chemicals
d.) Reagent usually used - ✔✔✔ Correct Answer > B
What is the MCL for fluoride to prevent health hazards in drinking
water?
a.) 1.0 mg/L
b.) 2.0 mg/L
c.) 3.0 mg/L
, Page 4 of 68
d.) 4.0 mg/L - ✔✔✔ Correct Answer > D
In a DAF unit, the sludge that accumulates on the surface is
called
a.) Float
b.) Sediment
c.) Scrape
d.) Slurry - ✔✔✔ Correct Answer > A
What minimum positive pressure are all community water
systems required to operate and maintain throughout their
distribution systems?
a.) 10 psi
b.) 15 psi
c.) 20 psi
d.) 30 psi - ✔✔✔ Correct Answer > C
Which of the following is the best means of controlling fire in
activated carbon?
