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2024 OIT SAMPLE TEST EXAM QUESTIONS WITH CORRECT ANSWERS
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2024 OIT SAMPLE TEST EXAM QUESTIONS WITH CORRECT ANSWERS
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2024 OIT SAMPLE TEST EXAMQUESTIONS WITH CORRECT
ANSWERS
what unit is used to measure water pressure - CORRECT-
ANSWERSKilopascals
any space where hazardous gas can accumulate or an oxygen deficient
atmosphere can occur - CORRECT-ANSWERSconfined space
why is chorine residual useful in water systems - CORRECT-
ANSWERSprovides disinfecting ability after the chlorine is added
what are devices used to measure the flow of water within a pipe called -
CORRECT-ANSWERSmeters
term "combined sewers" - CORRECT-ANSWERSstorm water and sewage are
collected in the same sewers
what is a wet well - CORRECT-ANSWERSa chamber in a pumping station
which collects wastewater
most common cause of sewer corrosion - CORRECT-ANSWERShydrogen
sulphide
what is a "crown" - CORRECT-ANSWERSthe inside top of a sewage pipe
why are gasoline or volatile solvents objectionable in a sewer - CORRECT-
ANSWERSthey produce a serious explosion hazard
which is a source of excessively clear water in a collection system -
infiltration from a high water table, exfiltration from a high water table,
excessive recirculation, inverted siphon - CORRECT-ANSWERSinfiltration from
a high water table
not a common method or equipment used to clean sanitary sewers -
flushing, power rodding, addition of ammonia, high velocity jet cleaners -
CORRECT-ANSWERSaddition of ammonia
, what happens when a sewer is surcharged - CORRECT-ANSWERShydraulically
overloading a sewer
a disease that can be transmitted through domestic wastewater - CORRECT-
ANSWERShepatitis
most common pump in pump station - CORRECT-ANSWERScentrifugal
why should infiltration of ground water be avoided in collection systems -
CORRECT-ANSWERSit can lead to a hydraulic overload of the sewer or
treatment plant
why is a minimum wastewater velocity of 0.6 meters per second necessary
in a gravity sewer - CORRECT-ANSWERSit will ensure that sewage has
enough velocity to go up minor increases in sewer elevation
the deposition of solids in a sewer line would most likely generate...... -
CORRECT-ANSWERShydrogen sulphide
what may cause odours to escape from collection systems - CORRECT-
ANSWERSlow velocity wastewater
**What is the main source of lead and copper in drinking water - CORRECT-
ANSWERScorrosion of lead and copper in plumbing materials
**what can cause over-heating of mechanical equipment - CORRECT-
ANSWERSover-greasing
**a total chlorine dosage of 6.9 mg/L is required for disinfection, if the
effluent flow is 11700 m3/d and the hypochlorite used has 65% available
chlorine how many kg/d of hypochlorite is required - CORRECT-ANSWERS124
kg/d
**what part of a concrete pipe in a gravity sewer is most vulnerable to
corrosion stemming from the effects of septic wastewater - CORRECT-
ANSWERScrown
**reviewing all aspects of the wastewater treatment plant to determine what
would occur during various types of emergency situations is known as
a ........ - CORRECT-ANSWERSvulnerability assessment
1 kPa raises water - CORRECT-ANSWERS10.2 cm
unit used to measure the total daily or monthly electrical usage - CORRECT-
ANSWERSKilowatt hours
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