What color indicator that reacts with chlorine to form a pink color?
What is DPD (N, N-diethyl-p-phenylenediamine)?
100
Under what operating condition do motors pull the most current? (start up, shut down or full operating speed)
What is start up?
100
Name three types of sewers.
What is sanitary, storm and combined?
100
A tank has a length of 100 feet, a width of 25 feet and a depth of 15 feet. What is the surface area in sq. ft.?
What is 2500 sq. ft.?
100
This gas is greenish-yello in color, has a noxious odor, is 2.5 times as dense as air and may cause toxicity if inhaled or through contact with skin.
What is chlorine gas?
200
How often shoudl pH meters be calibrated?
What is at least daily?
200
A pump in continuous service should be inspected for cleanliness and leakage how often?
What is daily?
200
Primary treatment is what type of treatment process? (physical, chemical or biological?)
What is physical?
200
How many watts of power does a single-phase motor use if it pulls 12 amps at 220 volts and has a power factor of 0.8?
What is 2112 watts?
200
In case of a chemical contact with eyes or skin, what is the minimum amount of time you should flush the area iwth water?
What is 15 minutes?
300
Name two types of quality control tests?
What are duplicates, blanks, lab standards, unknown standards or spikes?
300
Check valves are used for which of the following reasons (permit air to escape from the pipe, permit flow in one direction, to stop flow in both directions?)
What is to permit flow in one direction?
300
What laboratory analysis is best to determine the efficiency of a trickling filter? (ammonia, pH, alkalinity, BOD or total chlorine)
What is BOD?
300
If the chlorine dose is 4.25 mg/L and the chlorine residual is 1.20 mg/L. What is the chlorine demand in mg/L?
What is 3.05 mg/L?
300
The proper emergency repair kit for a ton cylinder is _____.
What is Emergency Kit B?
400
What temperature should you set the drying oven to when determining the TSS using the gravimetric method?
What is 103-105 degrees C?
400
In electrical circuits a device used to reduce voltage is called which of the following (a transformer, a transducer or a voltmeter)
What is a transformer?
400
The quantity of chlorine that can be fed from a cylinder is determined by the cylinder _____. (position, valve size, pressure, gas purity or temperature)
What is temperature?
400
The motor horsepower required for a pumping job is 39hp. If the power cost is $0.08/kW-hr, what is the cost of operating the motor for one hour?
What is $2.33/hr?
400
What type of fire extinguisher should be used on combustible materials, such as wood, paper or trash?
What is Class A?
500
How long should you keep an MSDS on file?
What is 30 years?
500
During a routine inspection of a centrifugal pump, the operator notices the bearings are excessively hot. This is most likely the result of what? (overlubrication, a worn impeller, or a worn packing?)
What is overlubrication?
500
During low influent plant flows or high organic loadings to the plant, how should the recirculation rate be adjusted? (decrease, increase, stay the same)
What is increase?
500
450 mL of 5N NaOH is diluted to one liter. What is the new normality of the solution?
What is 2.25N?
500
Ladders used in trenches shall protrude at least _____ feet above the trench edge.