Laboratory
Equipment
Operations
Math
Safety
100
Which is more accurate when measuring a volume: a graduated cylinder or a volumetric flask?
What is volumetric flask?
100
Which type of dry chemical feeders are more accurate, gravimetric or volumetric?
What is gravimetric?
100
A one-cubic foot container will hold how many gallons of water?
What is 7.48 gallons?
100

A screening pit has a capacity of 400 cu.ft. If an average of 3.8 cu.ft of screenings are removed daily from the wastewater flow, in how many days will the pit be full?

What is 105 days?

100
OSHA is the acronym for what?
What is Occupational Safety and Health Administration?
200
When running the test for available phosphates, if phosphates are present in the water sample it will turn what color?
What is blue?
200
A component that can be installed on a pump to hold the prime is called what?
What is foot valve?
200
What are the main workers in the activated sludge process?
What are bacteria?
200
Convert 2730 gpm into gpd.
What is 3,931,200 gpd?
200
What are two basic types of hearing protection?
What are full type earmuffs and earplug insertion?
300
In order for a BOD analysis to be valid, the dissolved oxygen content in the bottle after a 5-day incubation period must be at least _____ mg/L.
What is 1.0 mg/L?
300
When packing a centrifugal pump, the packing gland should be tightened slowly over a period of several _____ ?
What is hours?
300
What determines the quantity of chlorine that can be fed from a cylinder?
What is cylinder temperature?
300

Find the capacity of a cylindrical tank in gallons if the diameter is 12.8 ft adn the height is 15.6 ft?

What is 15,007 gallons?

300
Shielding, shoring or sloping is required for trenches _____ feet deep or deeper.
What is 5 feet?
400
Dividing the molecular weight by the number of hydrogen equivalents gives what?
What is equivalent weight?
400
These are installed in a pump to protect the impeller and pump casing from excessive wear.
What are wearing rings?
400
What type of wastewater pond is aerobic on the top layer and anaerobic on the bottom?
What is a facultative pond?
400

The flow to a sedimentation tank 90 ft long, 30 ft wide and 12 feet deep is 3.0 MGD. What is the detention time in the tank in hours?

What is 1.93?

400
According to OSHA regulations, what is the minimum number of people required to repair a chlorine gas leak?
What is 4, 2 entrants and 2 attendants?
500
What does COD stand for?
What is chemical oxygen demand?
500
Name the instrument that measures the amount of light scattered by particles in a water sample.
What is a turbidimeter?
500
A trickling filter removes the nutrients of wastewater by what means? (filtering, straining, adsorption and absorption or ponding)
What is adsorption and absorption?
500

An aeration basin is 120 ft long, 45 ft wide and holds wastewater to a depth of 12 ft. If the aeration basin has an MLSS concentration of 2150 mg/L, how many pounds of MLSS are under aeration?

What is 8,691 mg/L?

500
How long should confined space entry permits be kept on file?
What is 1 year?
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