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OIT WATER TREATMENT TEST | OPERATOR-INTRAINING EXAM | ALL QUESTIONS AND CORRECT ANSWERS (GRADED A+) | VERIFIED ANSWERS | JUST RELEASED$25.99
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OIT WATER TREATMENT TEST | OPERATOR-IN-
TRAINING EXAM | ALL QUESTIONS AND
CORRECT ANSWERS (GRADED A+) | VERIFIED
ANSWERS | JUST RELEASED
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 ---------CORRECT ANSWER-----------------b) 140 kPa
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) ---------CORRECT
ANSWER-----------------c) peak demand (L/hour)
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 ---------CORRECT ANSWER-------------
----d) remove deposits from the pipeline
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 ---------
CORRECT ANSWER-----------------d) to store a large volume of water for
long periods of time
What is the name of the valve which connects the customer's service line
to the municipal water line?
a) bypass valve
b) control flume
c) curb stop
d) check valve ---------CORRECT ANSWER-----------------c) curb stop
In an activated sludge process, some of the sludge collected in the
secondary sedimentation tank is returned to the _______ to maintain the
mass of the mixed liquor.
a) grit channel
b) aeration tank
c) primary sedimentation tank
d) digester ---------CORRECT ANSWER-----------------b) aeration tank
Why does untreated sewage cause serious problems to streams and
lakes?
a) sewage will deplete the water of oxygen required by fish and other
animals
b) sewage creates unpleasant odours for water animals
c) sewage decreases the temperature of the water
d) sewage will decrease the amount of nutrients in the water ---------
CORRECT ANSWER-----------------a) sewage will deplete the water of
oxygen required by fish and other animals
,A higher than normal BOD in the wastewater entering a conventional
wastewater treatment plant will most likely have the greatest effect on
which of the following processes?
a) grit removal
b) primary clarification
c) activated sludge
d) secondary clarification ---------CORRECT ANSWER-----------------c)
activated sludge
Which of the following devices is used to measure the flow of wastewater in
an open channel?
a) comminutor
b) compactor
c) parshall flume
d) sluice gate ---------CORRECT ANSWER-----------------c) parshall flume
Which of the following is a correct order of processes within a conventional
activated sludge treatment facility?
, Secondary treatment typically removes ______ of the BOD and suspended
solids.
a) 20-39%
b) 40-59%
c) 60-79%
d) 80-99% ---------CORRECT ANSWER-----------------d) 80-99%
Water entering a wastewater treatment plant will pass through a bar
screen. The bar screen is designed to remove which of the following items?
a) dissolved solids
b) grit and sand
c) large objects
d) nutrients ---------CORRECT ANSWER-----------------c) large objects
Define the term 'supernatant'
a) a solution which is supersaturated
b) a substance used to reduce odour in polluted waters
c) the liquid located above a sediment or precipitate
d) an operator who is extremely proficient in fulfilling their duties ---------
CORRECT ANSWER-----------------c) the liquid located above a sediment or
precipitate
A __________ is used to move wastewater from a wastewater lift station to
an elevated gravity sewer:
a) sewer lateral
b) force main
c) sanitary trunk main
d) transmission main ---------CORRECT ANSWER-----------------b) force
main
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