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OIT SAMPLE TEST QUESTIONS AND ANSWERS
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OIT SAMPLE TEST QUESTIONS AND ANSWERS
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OIT SAMPLE TEST QUESTIONS AND ANSWERSWhat unit is used to measure water pressure - Answers -Kilopascals
Any space where hazardous gas can accumulate or an oxygen deficient atmosphere
can occur - Answers -confined space
1 kpa raises water - Answers -10.2 cm
Unit used to measure the total daily or monthly electrical usage - Answers -Kilowatt
hours
4" pipe can carry ________________ of water as a 2" pipe (assuming same water
velocity and pressure) - Answers -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 - Answers -7.9 mg/L
Example of cross connection - Answers -connection between boiler and domestic water
line
Most likely cause of noise and vibration in a valve - Answers -Backflow in a pipe
Main reason wet wells for pumps pose safety hazard - Answers -subject to collection
toxic gases
How is water pressurized in a positive displacement pump - Answers -water is pushed
by a screw, piston, gear or diaphragm
Grease used to lubricate plant equipment should be - Answers -should be the same
grade or exact equivalent as recommended by the equipment manufacturer
2500 L/sec is equal to what in m3/sec - Answers -2.5
Chemical feeder will feed at max rate of 900 kg per day what is it in kg/min - Answers -
0.63
Properties of chlorine - Answers -greenish/yellow gas with penetrating odour, heavier
than air
"head" in hydraulic systems - Answers -height or energy of water above a specified
point
Who is primarily responsible for your safety - Answers -you
Why is methane gas dangerous - Answers -it is explosive
, What is BOD - Answers -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 - Answers -1.6m
What is the name given to the process used to kill pathogenic organisms in water
treatment - Answers -Disinfection
OIT not allowed to do - Answers -Be the operator with overall operational responsibility
of the system
Solution has a ph of 11 most effective way to neutralize - Answers -add an acid
Rate of flow (in L/s) in a 300mm diameter pipe with a water velocity of 0.8m/s - Answers
-57 L/s
What if liquid chlorine, alum, carbon dioxide or sulphuric acid was added to water -
Answers -the ph would decrease
Operator smells hydrogen sulphide in confined space - Answers -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 - Answers -chlorine will break down the organic material in water
What will prevent the backflow of water in a water main or service pipe - Answers -
check valve
Primary moving component of a centrifugal pump - Answers -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 - Answers -773
L/d
Primary moving component of a centrifugal pump - Answers -impeller
Name of organisms used to indicate bacterial contamination - Answers -pathogens
What property must a substance have to be a good coagulant - Answers -produce an
insoluble floc
What is indicated if the chlorine demand suddenly jumps from 0.9 mg/L in a well supply
- Answers -more water is being pumped
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