Laboratory
Equipment
Operations
Math
Safety
100
What is the percent solids in percent if the suspended solids is 10,000 mg/L?
What is 1%?
100
What type of pump includes parts such as a volute (expanding sprial), shaft and impeller?
What is centrifugal pump?
100
What chemical is used to check for chlorine gas leaks?
What is ammonia baum?
100
How many gallons are in 2,167 cubic feet?
What is 16,209 gallons?
100
What does MSDS stand for?
What is Material Safety Data Sheet?
200
In wastewater, BOD stands for what?
What is Biochemical Oxygen Demand?
200
Centrifugal and vertical turbines are what kind of pumps?
What is velocity pumps?
200
Name a water borne disease.
What is infectious hepatitis, typhoid fever, cholera or bacillary dysentary?
200
A clarifier has a diameter of 82 feet and a depth of 12 feet. What is the surface area of the clarifier in square feet?
What is 5278 sq. ft.?
200

What type of emergency repair kit is required for a 150 lb chlorine cylinder?

What is Emergency Kit A?

300
What temperature should you set the furnace to when determining the VSS using the gravimetric method?
What is 550 degrees C?
300
A method that will prevent backflow by physically disconnecting the water supply and the source of contamination is called what?
What is an air gap?
300
Secondary treatment is what type of process? (physical, chemical or biological?)
What is biological?
300
A channel is 7 feet wide, has water flowing to a depth of 3 feet and a velocity of 2.8 fps. What is the flow through the channel in cfs?
What is 59 cfs?
300

If a flammable substance is spilled, you should turn off or remove what?

What is ignition sources?

400
What document does an operator find a list of tests approved for NPDES reporting?
What is 40 CFR 136?
400
Packing should be cut on a _____ degree angle and installed in a staggered pattern.
What is 90 degrees?
400
Name a problem associated with trickling filters.
What is odors, ponding, turbid effluent or filter flies?
400
A water system has a chlorine demand of 4.1 mg/L and wants a residual of 1.1 mg/L. What should be the dose?
What is 5.2 mg/L?
400

A space large enough for a person to bodily enter and perform work, but not designed for continuous occupancy with limited means of entry and exit is called what?

What is a confined space?

500

What is the difference between CBOD and BOD?

What is nitrification inhibitor is added?

500
Properly installed packing will only have a slight leakage from the packing, usually how many drops per minute?
What is 20-60 drops per minute?
500
Which process does a trickling filter operate in? (anaerobic, facultative, aerobic or none of them?)
What is aerobic?
500

A wastewater plant treats 7.5 MGD. If the chlorine dose needs to be 3 mg/L, what is the amount of chlorine gas required in lbs/day?

What is 188 lbs/day?

500
Excavated materials or equipment that could pose a hazard by falling or rolling into an excavation should be placed or kept at least _____ feet from the edge of the trench?
What is 2 feet?
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