OIT sample test All Possible Questions and Answers with complete solution
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Course
OIT
Institution
OIT
to calculate the amount of chemical needed, an operator must know the proper dosage
required and the.... - ️️rate of water flow
operator smells hydrogen sulphide in confined space - ️️do not enter until no smell
and only when all safety equipment is in place
1 kPa raises water - ️️1...
OIT sample test
to calculate the amount of chemical needed, an operator must know the proper dosage
required and the.... - ✔️✔️rate of water flow
operator smells hydrogen sulphide in confined space - ✔️✔️do not enter until no smell
and only when all safety equipment is in place
1 kPa raises water - ✔️✔️10.2 cm
unit used to measure the total daily or monthly electrical usage - ✔️✔️Kilowatt hours
4" pipe can carry ________________ of water as a 2" pipe (assuming same water
velocity and pressure) - ✔️✔️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 - ✔️✔️7.9 mg/L
example of cross connection - ✔️✔️connection between boiler and domestic water line
most likely cause of noise and vibration in a valve - ✔️✔️Backflow in a pipe
main reason wet wells for pumps pose safety hazard - ✔️✔️subject to collection toxic
gases
How is water pressurized in a positive displacement pump - ✔️✔️water is pushed by a
screw, piston, gear or diaphragm
grease used to lubricate plant equipment should be - ✔️✔️should be the same grade
or exact equivalent as recommended by the equipment manufacturer
2500 L/sec is equal to what in m3/sec - ✔️✔️2.5
What is the name given to the process used to kill pathogenic organisms in water
treatment - ✔️✔️Disinfection
OIT not allowed to do - ✔️✔️Be the operator with overall operational responsibility of
the system
solution has a pH of 11 most effective way to neutralize - ✔️✔️add an acid
, rate of flow (in L/s) in a 300mm diameter pipe with a water velocity of 0.8m/s - ✔️✔️57
L/s
chemical feeder will feed at max rate of 900 kg per day what is it in kg/min - ✔️✔️0.63
properties of chlorine - ✔️✔️greenish/yellow gas with penetrating odour, heavier than
air
"head" in hydraulic systems - ✔️✔️height or energy of water above a specified point
who is primarily responsible for your safety - ✔️✔️you
what unit is used to measure water pressure - ✔️✔️Kilopascals
why is methane gas dangerous - ✔️✔️it is explosive
what is BOD - ✔️✔️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 - ✔️✔️1.6m
what if liquid chlorine, alum, carbon dioxide or sulphuric acid was added to water -
✔️✔️the pH would decrease
chlorine is sometimes added to water because it is a strong oxidizer, what does this
mean - ✔️✔️chlorine will break down the organic material in water
what will prevent the backflow of water in a water main or service pipe - ✔️✔️check
valve
any space where hazardous gas can accumulate or an oxygen deficient atmosphere
can occur - ✔️✔️confined space
primary moving component of a centrifugal pump - ✔️✔️impeller
name of organisms used to indicate bacterial contamination - ✔️✔️pathogens
what property must a substance have to be a good coagulant - ✔️✔️produce an
insoluble floc
what is contact time - ✔️✔️amount of time allowed for chlorine to react in water to
provide disinfection
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