WASTEWATER D LICENSE EXAM WITH
GUARANTEED ACCURATE ANSWERS
How many PPB equals one PPM? - ACCURATE ANSWER✅✅One thousand
parts per billion equals one part per million
If the bubbler system air supply line at the wet well is clogged, what will this cause
the pump to do? - ACCURATE ANSWER✅✅Pressure build up in the supply
line would signal more water column then there really was, causing the pump to
run longer than necessary, possibly not kick off and run continually
If the bubbler system air supply line at the wet well has a hole in it above the water
level, what will this cause the pump to do? - ACCURATE ANSWER✅✅It would
cause a low pressure reading showing a lower water level then there really is, or
possible not even kicking on the pump
What is the best way to keep within the operating budget? - ACCURATE
ANSWER✅✅keep list of purchases and expenses to date during fiscal year
comparisons should be made with budget allocations to avoid excess purchases
review purchases monthly and compare to budget
If a diaphragm pump has 2 check valves open, what will the pump do? -
ACCURATE ANSWER✅✅It would not pump properly because 1 check valve
should be shut while the other is open
A suction lift pump on the inlet side normally reads 2in of mercury on the psi
vacuum gauge but not reads 3in of mercury. What is the problem with the pump? -
,ACCURATE ANSWER✅✅A higher vacuum than normal may indicate a
partially plugged or restricted suction line.
A lower vacuum may indicate a higher wet well level or a worn pump impeller or
wearing rings.
One mg per L equals how many pounds per 1 MG? - ACCURATE
ANSWER✅✅8.34
What is the proper way to put packing in a pump? - ACCURATE
ANSWER✅✅cut the packing rope about 45 degree angle, place around shaft, be
sure to offset/stagger the next joint from the previous
How many drips of water should you have coming out of a packing seal? -
ACCURATE ANSWER✅✅no drip on a mechanical seal
How many drips of water should you have coming out of a packing seal? 2 -
ACCURATE ANSWER✅✅what the operation and maintenance manual
recommends
A one horsepower motor that runs on 110 volts using 10 amps has what efficiency?
- ACCURATE ANSWER✅✅most motors run from 80-95% efficiency
A motor that has 440 volt supply is usually what phase of power? - ACCURATE
ANSWER✅✅3 phase
NPDES - ACCURATE ANSWER✅✅National Pollutant Discharge Elimination
System
,the regulatory agency document issued by either a federal or state agency which is
designed to control all discharges of pollutants from point sources into US
waterways - ACCURATE ANSWER✅✅NPDES permit
What is the name of our operating permit? - ACCURATE ANSWER✅✅NPDES
What is the best way to promote safety in the workplace? - ACCURATE
ANSWER✅✅the supervisor needs to be safe and promote safety in such a
manner to get the employees involved
What is normally used to raise the pH in sludge? - ACCURATE
ANSWER✅✅lime
What is the common device used to measure the effluent of a lagoon? -
ACCURATE ANSWER✅✅v notch weir
What concentration of H2S is unsafe to humans? - ACCURATE
ANSWER✅✅death in a few minutes at 0.2%. Paralyzes respiratory center
What is the minimum O2 concentration that is safe for workers to enter a manhole?
- ACCURATE ANSWER✅✅If O2 is less than 19.5%, do not enter space without
respiratory protection. Normal air contains 20.93% of O2.
Normal air contains ______% of O2 - ACCURATE ANSWER✅✅19.5%
What knob is turned to control the usage of chlorine applied? - ACCURATE
ANSWER✅✅rotameter
, Can you store BOD at 4C for 48 hours? - ACCURATE ANSWER✅✅yes
What is the minimum velocity of the water flow for a grit chamber and the
maximum flow? - ACCURATE ANSWER✅✅1.0 feet per second minimum
1.5 feet per second optimum
2.0 feet per second maximum
How many mg/L equals one grain per gallon? - ACCURATE ANSWER✅✅17.1
mg/L
Dissolved oxygen increases when the temperature __________ - ACCURATE
ANSWER✅✅decreases
You can tell if a clarifier scraper arm is working by what means? - ACCURATE
ANSWER✅✅the simplest is to visual check to see if the scum scraper arm is
moving properly
check into foam
If the sludge is thick or thin, then what does this tell you about the sludge scraper?
- ACCURATE ANSWER✅✅possible answer is the flights are damaged or the
speed of the scrapers(flights) need to be increased if sludge is too thick
or slowed down if the sludge is too thin
aging and maturing of a body of water - ACCURATE
ANSWER✅✅eutrophication
GUARANTEED ACCURATE ANSWERS
How many PPB equals one PPM? - ACCURATE ANSWER✅✅One thousand
parts per billion equals one part per million
If the bubbler system air supply line at the wet well is clogged, what will this cause
the pump to do? - ACCURATE ANSWER✅✅Pressure build up in the supply
line would signal more water column then there really was, causing the pump to
run longer than necessary, possibly not kick off and run continually
If the bubbler system air supply line at the wet well has a hole in it above the water
level, what will this cause the pump to do? - ACCURATE ANSWER✅✅It would
cause a low pressure reading showing a lower water level then there really is, or
possible not even kicking on the pump
What is the best way to keep within the operating budget? - ACCURATE
ANSWER✅✅keep list of purchases and expenses to date during fiscal year
comparisons should be made with budget allocations to avoid excess purchases
review purchases monthly and compare to budget
If a diaphragm pump has 2 check valves open, what will the pump do? -
ACCURATE ANSWER✅✅It would not pump properly because 1 check valve
should be shut while the other is open
A suction lift pump on the inlet side normally reads 2in of mercury on the psi
vacuum gauge but not reads 3in of mercury. What is the problem with the pump? -
,ACCURATE ANSWER✅✅A higher vacuum than normal may indicate a
partially plugged or restricted suction line.
A lower vacuum may indicate a higher wet well level or a worn pump impeller or
wearing rings.
One mg per L equals how many pounds per 1 MG? - ACCURATE
ANSWER✅✅8.34
What is the proper way to put packing in a pump? - ACCURATE
ANSWER✅✅cut the packing rope about 45 degree angle, place around shaft, be
sure to offset/stagger the next joint from the previous
How many drips of water should you have coming out of a packing seal? -
ACCURATE ANSWER✅✅no drip on a mechanical seal
How many drips of water should you have coming out of a packing seal? 2 -
ACCURATE ANSWER✅✅what the operation and maintenance manual
recommends
A one horsepower motor that runs on 110 volts using 10 amps has what efficiency?
- ACCURATE ANSWER✅✅most motors run from 80-95% efficiency
A motor that has 440 volt supply is usually what phase of power? - ACCURATE
ANSWER✅✅3 phase
NPDES - ACCURATE ANSWER✅✅National Pollutant Discharge Elimination
System
,the regulatory agency document issued by either a federal or state agency which is
designed to control all discharges of pollutants from point sources into US
waterways - ACCURATE ANSWER✅✅NPDES permit
What is the name of our operating permit? - ACCURATE ANSWER✅✅NPDES
What is the best way to promote safety in the workplace? - ACCURATE
ANSWER✅✅the supervisor needs to be safe and promote safety in such a
manner to get the employees involved
What is normally used to raise the pH in sludge? - ACCURATE
ANSWER✅✅lime
What is the common device used to measure the effluent of a lagoon? -
ACCURATE ANSWER✅✅v notch weir
What concentration of H2S is unsafe to humans? - ACCURATE
ANSWER✅✅death in a few minutes at 0.2%. Paralyzes respiratory center
What is the minimum O2 concentration that is safe for workers to enter a manhole?
- ACCURATE ANSWER✅✅If O2 is less than 19.5%, do not enter space without
respiratory protection. Normal air contains 20.93% of O2.
Normal air contains ______% of O2 - ACCURATE ANSWER✅✅19.5%
What knob is turned to control the usage of chlorine applied? - ACCURATE
ANSWER✅✅rotameter
, Can you store BOD at 4C for 48 hours? - ACCURATE ANSWER✅✅yes
What is the minimum velocity of the water flow for a grit chamber and the
maximum flow? - ACCURATE ANSWER✅✅1.0 feet per second minimum
1.5 feet per second optimum
2.0 feet per second maximum
How many mg/L equals one grain per gallon? - ACCURATE ANSWER✅✅17.1
mg/L
Dissolved oxygen increases when the temperature __________ - ACCURATE
ANSWER✅✅decreases
You can tell if a clarifier scraper arm is working by what means? - ACCURATE
ANSWER✅✅the simplest is to visual check to see if the scum scraper arm is
moving properly
check into foam
If the sludge is thick or thin, then what does this tell you about the sludge scraper?
- ACCURATE ANSWER✅✅possible answer is the flights are damaged or the
speed of the scrapers(flights) need to be increased if sludge is too thick
or slowed down if the sludge is too thin
aging and maturing of a body of water - ACCURATE
ANSWER✅✅eutrophication
