Laboratory
Equipment
Operations
Math
Safety

100

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

100

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

100

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

100

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?
What is 0.59 cu.ft./sec?

100

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

200

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

200

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

200

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

200

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

200

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

300

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

300

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

300

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?
What is activated sludge?

300

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

300

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

400

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

400

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?
What is a reduced pressure backflow preventer (RPBP)?

400

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?
What is endogenous respiration?

400

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

400

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

500

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

500

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

500

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

500

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

500

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?
What is lock-out/tag-out?