WASTEWATER D LICENCE ACTUAL EXAM CLASS WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS RATED A+
How many PPB equals one PPM? - (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? -
(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? - (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? - (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? - (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? - (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? - (answer)8.34
What is the proper way to put packing in a pump? - (answer)cut the packing rope about 45 degree
angle, place around shaft, be sure to offset/stagger the next joint from the previous
,WASTEWATER D LICENCE ACTUAL EXAM CLASS WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS RATED A+
How many drips of water should you have coming out of a packing seal? - (answer)no drip on a
mechanical seal
How many drips of water should you have coming out of a packing seal? 2 - (answer)what the operation
and maintenance manual recommends
A one horsepower motor that runs on 110 volts using 10 amps has what efficiency? - (answer)most
motors run from 80-95% efficiency
A motor that has 440 volt supply is usually what phase of power? - (answer)3 phase
NPDES - (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 - (answer)NPDES permit
What is the name of our operating permit? - (answer)NPDES
What is the best way to promote safety in the workplace? - (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? - (answer)lime
What is the common device used to measure the effluent of a lagoon? - (answer)v notch weir
What concentration of H2S is unsafe to humans? - (answer)death in a few minutes at 0.2%. Paralyzes
respiratory center
, WASTEWATER D LICENCE ACTUAL EXAM CLASS WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS RATED A+
What is the minimum O2 concentration that is safe for workers to enter a manhole? - (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 - (answer)19.5%
What knob is turned to control the usage of chlorine applied? - (answer)rotameter
Can you store BOD at 4C for 48 hours? - (answer)yes
What is the minimum velocity of the water flow for a grit chamber and the maximum flow? -
(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? - (answer)17.1 mg/L
Dissolved oxygen increases when the temperature __________ - (answer)decreases
You can tell if a clarifier scraper arm is working by what means? - (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? - (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
CORRECT ANSWERS RATED A+
How many PPB equals one PPM? - (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? -
(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? - (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? - (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? - (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? - (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? - (answer)8.34
What is the proper way to put packing in a pump? - (answer)cut the packing rope about 45 degree
angle, place around shaft, be sure to offset/stagger the next joint from the previous
,WASTEWATER D LICENCE ACTUAL EXAM CLASS WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS RATED A+
How many drips of water should you have coming out of a packing seal? - (answer)no drip on a
mechanical seal
How many drips of water should you have coming out of a packing seal? 2 - (answer)what the operation
and maintenance manual recommends
A one horsepower motor that runs on 110 volts using 10 amps has what efficiency? - (answer)most
motors run from 80-95% efficiency
A motor that has 440 volt supply is usually what phase of power? - (answer)3 phase
NPDES - (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 - (answer)NPDES permit
What is the name of our operating permit? - (answer)NPDES
What is the best way to promote safety in the workplace? - (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? - (answer)lime
What is the common device used to measure the effluent of a lagoon? - (answer)v notch weir
What concentration of H2S is unsafe to humans? - (answer)death in a few minutes at 0.2%. Paralyzes
respiratory center
, WASTEWATER D LICENCE ACTUAL EXAM CLASS WITH ACTUAL EXAM QUESTIONS AND
CORRECT ANSWERS RATED A+
What is the minimum O2 concentration that is safe for workers to enter a manhole? - (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 - (answer)19.5%
What knob is turned to control the usage of chlorine applied? - (answer)rotameter
Can you store BOD at 4C for 48 hours? - (answer)yes
What is the minimum velocity of the water flow for a grit chamber and the maximum flow? -
(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? - (answer)17.1 mg/L
Dissolved oxygen increases when the temperature __________ - (answer)decreases
You can tell if a clarifier scraper arm is working by what means? - (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? - (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
