WASTEWATER D LICENSE EXAM 2024/2025 WITH 100%
ACCURATE SOLUTIONS
How many PPB equals one PPM? - Precise 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? - Precise 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? - Precise
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? - Precise
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? -
Precise 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? - Precise 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? - Precise Answer
✔✔8.34
What is the proper way to put packing in a pump? - Precise 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?
- Precise Answer ✔✔no drip on a mechanical seal
How many drips of water should you have coming out of a packing seal?
2 - Precise Answer ✔✔what the operation and maintenance manual
recommends
,A one horsepower motor that runs on 110 volts using 10 amps has what
efficiency? - Precise Answer ✔✔most motors run from 80-95%
efficiency
A motor that has 440 volt supply is usually what phase of power? -
Precise Answer ✔✔3 phase
NPDES - Precise 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 - Precise Answer ✔✔NPDES permit
What is the name of our operating permit? - Precise Answer ✔✔NPDES
What is the best way to promote safety in the workplace? - Precise
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? - Precise Answer
✔✔lime
What is the common device used to measure the effluent of a lagoon? -
Precise Answer ✔✔v notch weir
, What concentration of H2S is unsafe to humans? - Precise 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? - Precise 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 - Precise Answer ✔✔19.5%
What knob is turned to control the usage of chlorine applied? - Precise
Answer ✔✔rotameter
Can you store BOD at 4C for 48 hours? - Precise Answer ✔✔yes
What is the minimum velocity of the water flow for a grit chamber and
the maximum flow? - Precise 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? - Precise Answer ✔✔17.1
mg/L
Dissolved oxygen increases when the temperature __________ - Precise
Answer ✔✔decreases
ACCURATE SOLUTIONS
How many PPB equals one PPM? - Precise 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? - Precise 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? - Precise
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? - Precise
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? -
Precise 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? - Precise 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? - Precise Answer
✔✔8.34
What is the proper way to put packing in a pump? - Precise 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?
- Precise Answer ✔✔no drip on a mechanical seal
How many drips of water should you have coming out of a packing seal?
2 - Precise Answer ✔✔what the operation and maintenance manual
recommends
,A one horsepower motor that runs on 110 volts using 10 amps has what
efficiency? - Precise Answer ✔✔most motors run from 80-95%
efficiency
A motor that has 440 volt supply is usually what phase of power? -
Precise Answer ✔✔3 phase
NPDES - Precise 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 - Precise Answer ✔✔NPDES permit
What is the name of our operating permit? - Precise Answer ✔✔NPDES
What is the best way to promote safety in the workplace? - Precise
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? - Precise Answer
✔✔lime
What is the common device used to measure the effluent of a lagoon? -
Precise Answer ✔✔v notch weir
, What concentration of H2S is unsafe to humans? - Precise 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? - Precise 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 - Precise Answer ✔✔19.5%
What knob is turned to control the usage of chlorine applied? - Precise
Answer ✔✔rotameter
Can you store BOD at 4C for 48 hours? - Precise Answer ✔✔yes
What is the minimum velocity of the water flow for a grit chamber and
the maximum flow? - Precise 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? - Precise Answer ✔✔17.1
mg/L
Dissolved oxygen increases when the temperature __________ - Precise
Answer ✔✔decreases
