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OPERATOR IN TRAINING CERT AND LICENCE( OIT ) test GUIDE
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OPERATOR IN TRAINING CERT AND LICENCE( OIT ) sample test GUIDE
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OPERATOR IN TRAINING CERT ANDLICENCE( OIT ) sample test GUIDE
what unit is used to measure water pressure - ANS Kilopascals
any space where hazardous gas can accumulate or an oxygen deficient atmosphere can occur -
ANS confined space
1 kPa raises water - ANS 10.2 cm
unit used to measure the total daily or monthly electrical usage - ANS Kilowatt hours
4" pipe can carry ________________ of water as a 2" pipe (assuming same water velocity and
pressure) - ANS same volume
a treatment plant removes 97.4% BOD from wastewater. If BOD entering is 305 mg/L, what will
the BOD in wastewater be leaving - ANS 7.9 mg/L
example of cross connection - ANS connection between boiler and domestic water line
most likely cause of noise and vibration in a valve - ANS Backflow in a pipe
main reason wet wells for pumps pose safety hazard - ANS subject to collection toxic gases
How is water pressurized in a positive displacement pump - ANS water is pushed by a
screw, piston, gear or diaphragm
grease used to lubricate plant equipment should be - ANS should be the same grade or
exact equivalent as recommended by the equipment manufacturer
2500 L/sec is equal to what in m3/sec - ANS 2.5
What is the name given to the process used to kill pathogenic organisms in water treatment -
ANS Disinfection
OIT not allowed to do - ANS Be the operator with overall operational responsibility of the
system
solution has a pH of 11 most effective way to neutralize - ANS add an acid
rate of flow (in L/s) in a 300mm diameter pipe with a water velocity of 0.8m/s - ANS 57 L/s
, chemical feeder will feed at max rate of 900 kg per day what is it in kg/min - ANS 0.63
properties of chlorine - ANS greenish/yellow gas with penetrating odour, heavier than air
"head" in hydraulic systems - ANS height or energy of water above a specified point
who is primarily responsible for your safety - ANS you
why is methane gas dangerous - ANS it is explosive
what is BOD - ANS Biochemical Oxygen Demand
sewage lagoon contains 224,000L of sewage, lagoon is 10 meters long and 14 meters wide,
how deep is the sewage in the lagoon - ANS 1.6m
what if liquid chlorine, alum, carbon dioxide or sulphuric acid was added to water - ANS the
pH would decrease
operator smells hydrogen sulphide in confined space - ANS do not enter until no smell and
only when all safety equipment is in place
chlorine is sometimes added to water because it is a strong oxidizer, what does this mean -
ANS chlorine will break down the organic material in water
what will prevent the backflow of water in a water main or service pipe - ANS check valve
primary moving component of a centrifugal pump - ANS impeller
in 8 hours a lift station pumped 2000 L/min and next 16 hours 6500 L/min. If lift station serves
11000 people, what is the daily per capita production of sewage - ANS 773 L/d
primary moving component of a centrifugal pump - ANS impeller
name of organisms used to indicate bacterial contamination - ANS pathogens
what property must a substance have to be a good coagulant - ANS produce an insoluble
floc
what is indicated if the chlorine demand suddenly jumps from 0.9 mg/L in a well supply -
ANS more water is being pumped
what is contact time - ANS amount of time allowed for chlorine to react in water to provide
disinfection
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