Laboratory Equipment Operations Math Safety

100

What is Sodium Thiosulfate?
What chemical is commonly used in lab analysis to neutralize chlorine in a sample?

100

What is 4 inches?
The minimum force main size is what?

100

What is 8.34 lbs/gal?
How much does one gallon of water weigh?

100

What is 0.59 cu.ft./sec?
The flow through a 6-inch diameter pipe is moving at a velocity of 3 ft/sec. What is the flow rate in cu.ft./sec?

100

What is 4 feet?
Ladders are required in trenches that are _____ feet deep or deeper.

200

What is an autoclave?
What laboratory device sterilizes microbial media and laboratory equipment using pressurized steam?

200

What is 12 and 30?
Ventilation in wet wells shall provide for at least _____ complete air changes per hour if continuous and intermittent at least _____ changes per hour.

200

What is decrease?
Trickling filter efficiency is decreased as the wastewater temperature applied is _____ (increased, decreased or stays the same)

200

What is 385 lbs?
How many pounds per day of chlorine are required to dose 14 million gallons of water at 3.3 mg/L?

200

What is carbon monoxide?
What is odorless, tasteless and can cause asphyxiation by displacing oxygen from the air in confined spaces?

300

What is 4.5?
What is the pH endpoint for total alkalinity?

300

What is 158 degrees F?
Fusible plugs on a chlorine cylinder are designed to melt at what temperature?

300

What is activated sludge?
What are sludge particles produced in raw or settled wastewater (primary effluent) by the growth of organisms in aeration basin in the presence of oxygen?

300

What is 1.9 mg/L?
Determine the chlorine dose in mg/L if 28 lbs of chlorine gas is fed for a flow of 1.75 MGD.

300

What is 10 mg/L?
Atmospheric alarms for hydrogen sulfide in lift stations and wastewater plants should be set to alarm at _______ mg/L.

400

What is sulfuric acid?
What acid is used for alkalinity titrations?

400

What is a reduced pressure backflow preventer (RPBP)?
A mechanical device consisting of 2 independently operating, spring loaded check valves with a reduced pressure zone between checks designed to protect against both backpressure adn backsiphonage is called what?

400

What is endogenous respiration?
What is it called when a reduced level of respiration occurs where organisms break down compounds within their own cells or make up to produce the oxygen they need?

400

What is 18.9 hp?
A pump must pump 3,000 gpm against a total head of 25 ft. What is the horsepower required to do the work?

400

What is continuously?
During a confined space entry, how often must the space be monitored for hazardous atmosphere?

500

What is 2?
How many buffers (minimum) are required to calibrate a pH meter?

500

What is cavitation?
The term that describes the condition when small bubbles of air form and eplode against the impeller causing a pinging sound is what?

500

What is nitrification?
What is the process called where bacteria change the ammonia and organic nitrogen in wastewater into oxidized nitrogen (usually nitrate)?

500

What is 33 degrees C?
Convert 91 degrees F tp degrees Celsius.

500

What is lock-out/tag-out?
The safety procedure that requires that an energy source be turned off and locked, and that information describing why a system is shut down is displayed on a tag is called what?

Wastewater

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