| Disinfection | Safety | Laboratory | Equipment | Math |
|---|---|---|---|---|
100What is chlorine gas?
This chlorine compund will lower the pH of water.
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100What is radon?
This gas is odorless and colorless. It occurs naturally in certain types of bedrock and is the 2nd leding cause of lung cancer.
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100What is sodium thiosulfate?
The chemical added to microbiological sample bottles to neutralize chlorine.
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100What is an impellar?
This part of a pump may be closed, open, or semi-open.
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100What is 9.5 lbs/gal?
Find the density of ferric chloride in lbs/gal.
(Specific Gravity of ferric chloride is 1.140)
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200What is turbidity?
A substance present in water that will reduce the effectiveness of disinfection by sheilding pathogens from the disinfectant.
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200What is positive pressure?
The only type of self contained breathing appaatus than should be used at water plants.
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200What is an autoclave?
A device that sterilizes laboratory equipment using pressurized steam.
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200What is a positive displacement pump?
This type of pump is most commonly used to feed chemicals.
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200What is 5278 ft²?
A clarifier has a diameter of 82 ft and a depth of 12 ft. Find the surface area of the clarifier in square ft.
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300What is a combined residual?
A chlorine residual that is formed by the reaction of chlorine with other substances in the water such as ammonia. It is not as effective as free residual.
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300What is 460?
One volume of liquid chlorine gas will expand at room temperature and pressure this many volumes of gas.
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300What is a representative sample?
A sample that contains essentially the same constituents as the body of water from which it was taken.
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300What is a nephelometric turbidimeter?
The instrument that measures the amount of light scattered by particles in a water sample.
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300What is 2.25 N
450 ml of 5 N NaOH is diluted to one liter. Find the new normality of the solution.
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400What are total coliform and chlorine residual?
The two tests used to determine the effectiveness of chlorine disinfection.
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400What is 158 F?
The fusible plug in a chlorine cylinder is designed to melt at this temperature.
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400What is 30 hours?
The maximum amount of time between the collection of a bacteriological sample and its analysis. The holding time.
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400What is a coolant?
The leakage of seal water around the packing on a centrifugal pump is important because it acts as _________. (a corrosion inhibitor, a scale inhibiter, or a coolant).
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400What is 52 mg/L?
A laboratory solution is made by taking 52 milligrams of Sodium Chloride and dissolving it in a liter of water. Find the concentration in mg/L.
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500What is ozone?
This disinfectant must be manufactured on site. It is a bluish, toxic gas with a pungent odor. It leaves no residual and requires large amounts of energy to generate.
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500What is 4?
To entrants and two attendants
The number of people required to respond to a chlorine leak.
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500What is SPADNS?
This test for fluoride is subject to more interferences.
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500What is overlubrication?
During a routine inspection of a centrifugal pump, the operator notices the bearings are excessively hot. This is most likely the result of _____.(overlubrication, a worn impeller, or a worn packing)
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500What is 0.38 ,non-agressive?
Calculate the Langeleir Index for the following information.
pH = 8.6
Temperature =15◦C
TDS = 200 mg/L
Calcium = 50 mg/L
Alkalinity = 100 mg/L
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