WATER TREATMENT OIT TEST NEWEST ACTUAL 2025/2026
EXAM WITH COMPLETE QUESTIONS AND ANSWERS
VERIFIED/GRADED A+
b) 0.3 mg/L -----Answers----The chlorine dosage of a town's
water source is 4.0 mg/L. The chlorine demand for the water is
3.7 mg/L. What is the chlorine residual?
a) 0 mg/L
b) 0.3 mg/L
c) 3.7 mg/L
d) 4.3 mg/L
a) screens, coagulation, flocculation, filters, chlorination -----
Answers----Which of the following is the correct order of
processes within a cognitional surface water treatment plant?
a) screens, coagulation, flocculation, filters, chlorination
b) screens, flocculation, coagulation, chlorination, filters
c) chlorination, screens, filtration, coagulation, flocculation
d) screens, filters, flocculation, coagulation, chlorination
b) it is the amount of time allowed for chlorine to react in
water to provide disinfection -----Answers----What does the
term 'contact time' mean?
,a) it is the amount of time a person is exposed to chlorine
b) it is the amount of time allowed for chlorine to react in
water to provide disinfection
c) it is the amount of time a coagulant is exposed to water
before flocculation occurs
d) it is the amount of time it takes for chlorine to sterilize
water
d) negative pressure in the water main -----Answers----
Backflow siphonage is caused by:
a) positive pressure in the water main
b) unprotected connections
c) unprotected openings
d) negative pressure in the water main
b) 140 kPa -----Answers----When flushing a water main,
operators should ensure that the pressure in nearby areas
does not drop below _______.
a) 60 kPa
b) 140 kPa
c) 350 kPa
d) 550 kPa
, c) peak demand (L/hour) -----Answers----Which of the
following best describes the largest volume of water a
distribution system would normally supply during a day?
a) minimum demand (L/hour)
b) average demand (L/hour)
c) peak demand (L/hour)
d) average demand per person (L/hour/person)
d) remove deposits from the pipeline -----Answers----
Distribution lines are flushed periodically to:
a) increase water pressure in the system
b) reduce the risk of water hammer
c) ensure that chlorine does not accumulate in pipes
d) remove deposits from the pipeline
d) to store a large volume of water for long periods of time ---
--Answers----What is NOT one of the main purposes of
distribution storage?
a) to help satisfy peak demand
b) to allow for a uniform water treatment and pumping rate
c) to provide water for firefighting needs
d) to store a large volume of water for long periods of time
EXAM WITH COMPLETE QUESTIONS AND ANSWERS
VERIFIED/GRADED A+
b) 0.3 mg/L -----Answers----The chlorine dosage of a town's
water source is 4.0 mg/L. The chlorine demand for the water is
3.7 mg/L. What is the chlorine residual?
a) 0 mg/L
b) 0.3 mg/L
c) 3.7 mg/L
d) 4.3 mg/L
a) screens, coagulation, flocculation, filters, chlorination -----
Answers----Which of the following is the correct order of
processes within a cognitional surface water treatment plant?
a) screens, coagulation, flocculation, filters, chlorination
b) screens, flocculation, coagulation, chlorination, filters
c) chlorination, screens, filtration, coagulation, flocculation
d) screens, filters, flocculation, coagulation, chlorination
b) it is the amount of time allowed for chlorine to react in
water to provide disinfection -----Answers----What does the
term 'contact time' mean?
,a) it is the amount of time a person is exposed to chlorine
b) it is the amount of time allowed for chlorine to react in
water to provide disinfection
c) it is the amount of time a coagulant is exposed to water
before flocculation occurs
d) it is the amount of time it takes for chlorine to sterilize
water
d) negative pressure in the water main -----Answers----
Backflow siphonage is caused by:
a) positive pressure in the water main
b) unprotected connections
c) unprotected openings
d) negative pressure in the water main
b) 140 kPa -----Answers----When flushing a water main,
operators should ensure that the pressure in nearby areas
does not drop below _______.
a) 60 kPa
b) 140 kPa
c) 350 kPa
d) 550 kPa
, c) peak demand (L/hour) -----Answers----Which of the
following best describes the largest volume of water a
distribution system would normally supply during a day?
a) minimum demand (L/hour)
b) average demand (L/hour)
c) peak demand (L/hour)
d) average demand per person (L/hour/person)
d) remove deposits from the pipeline -----Answers----
Distribution lines are flushed periodically to:
a) increase water pressure in the system
b) reduce the risk of water hammer
c) ensure that chlorine does not accumulate in pipes
d) remove deposits from the pipeline
d) to store a large volume of water for long periods of time ---
--Answers----What is NOT one of the main purposes of
distribution storage?
a) to help satisfy peak demand
b) to allow for a uniform water treatment and pumping rate
c) to provide water for firefighting needs
d) to store a large volume of water for long periods of time
