Exam (elaborations)
VA CONTRACTORS: VIRGINIA (CLASS A OR B)
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VA CONTRACTORS: VIRGINIA (CLASS A OR B)
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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
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
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
Chemical feeder will feed at max rate of 900 kg per day what is it in kg/min
- Answers-0.63
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
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 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
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