Wastewater Treatment D License Exam with precise || || || || || || ||
detailed solutions ||
How many PPB equals one PPM? - correct 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? - correct 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? - correct 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? - correct 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? - correct
|| || || || || || || || || || || || || || || ||
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? - correct
|| || || || || || || || || || || || || || || ||
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? - correct answer✔✔8.34
|| || || || || || || || || || || || ||
What is the proper way to put packing in a pump? - correct 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? - correct
|| || || || || || || || || || || || || || || ||
answer✔✔no drip on a mechanical seal || || || || ||
How many drips of water should you have coming out of a packing seal? 2 - correct
|| || || || || || || || || || || || || || || || ||
answer✔✔what the operation and maintenance manual recommends || || || || || ||
A one horsepower motor that runs on 110 volts using 10 amps has what efficiency? - correct
|| || || || || || || || || || || || || || || ||
answer✔✔most motors run from 80-95% efficiency
|| || || || || ||
A motor that has 440 volt supply is usually what phase of power? - correct answer✔✔3
|| || || || || || || || || || || || || || || ||
phase
NPDES - correct 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 - correct
|| || || || || || || || || || || || || ||
answer✔✔NPDES permit ||
What is the name of our operating permit? - correct answer✔✔NPDES
|| || || || || || || || || ||
What is the best way to promote safety in the workplace? - correct 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? - correct answer✔✔lime
|| || || || || || || || || || || ||
What is the common device used to measure the effluent of a lagoon? - correct answer✔✔v
|| || || || || || || || || || || || || || || ||
notch weir ||
What concentration of H2S is unsafe to humans? - correct 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? -
|| || || || || || || || || || || || || || || ||
correct 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 - correct answer✔✔19.5%
|| || || || || || || ||
What knob is turned to control the usage of chlorine applied? - correct answer✔✔rotameter
|| || || || || || || || || || || || ||
Can you store BOD at 4C for 48 hours? - correct answer✔✔yes
|| || || || || || || || || || ||
, What is the minimum velocity of the water flow for a grit chamber and the maximum flow?
|| || || || || || || || || || || || || || || || ||
- correct 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? - correct answer✔✔17.1 mg/L
|| || || || || || || || || || ||
Dissolved oxygen increases when the temperature __________ - correct
|| || || || || || || || ||
answer✔✔decreases
You can tell if a clarifier scraper arm is working by what means? - correct 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? - correct
|| || || || || || || || || || || || || || || || || || ||
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 - correct answer✔✔eutrophication
|| || || || || || || || || ||
eutrophication - correct answer✔✔aging and maturing of a body of water || || || || || || || || || ||
If the effluent from a treatment facility contained 5mg/L of BOD, what effect would this
|| || || || || || || || || || || || || || ||
have on the receiving stream? - correct answer✔✔little effect
|| || || || || || || ||
detailed solutions ||
How many PPB equals one PPM? - correct 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? - correct 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? - correct 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? - correct 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? - correct
|| || || || || || || || || || || || || || || ||
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? - correct
|| || || || || || || || || || || || || || || ||
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? - correct answer✔✔8.34
|| || || || || || || || || || || || ||
What is the proper way to put packing in a pump? - correct 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? - correct
|| || || || || || || || || || || || || || || ||
answer✔✔no drip on a mechanical seal || || || || ||
How many drips of water should you have coming out of a packing seal? 2 - correct
|| || || || || || || || || || || || || || || || ||
answer✔✔what the operation and maintenance manual recommends || || || || || ||
A one horsepower motor that runs on 110 volts using 10 amps has what efficiency? - correct
|| || || || || || || || || || || || || || || ||
answer✔✔most motors run from 80-95% efficiency
|| || || || || ||
A motor that has 440 volt supply is usually what phase of power? - correct answer✔✔3
|| || || || || || || || || || || || || || || ||
phase
NPDES - correct 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 - correct
|| || || || || || || || || || || || || ||
answer✔✔NPDES permit ||
What is the name of our operating permit? - correct answer✔✔NPDES
|| || || || || || || || || ||
What is the best way to promote safety in the workplace? - correct 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? - correct answer✔✔lime
|| || || || || || || || || || || ||
What is the common device used to measure the effluent of a lagoon? - correct answer✔✔v
|| || || || || || || || || || || || || || || ||
notch weir ||
What concentration of H2S is unsafe to humans? - correct 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? -
|| || || || || || || || || || || || || || || ||
correct 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 - correct answer✔✔19.5%
|| || || || || || || ||
What knob is turned to control the usage of chlorine applied? - correct answer✔✔rotameter
|| || || || || || || || || || || || ||
Can you store BOD at 4C for 48 hours? - correct answer✔✔yes
|| || || || || || || || || || ||
, What is the minimum velocity of the water flow for a grit chamber and the maximum flow?
|| || || || || || || || || || || || || || || || ||
- correct 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? - correct answer✔✔17.1 mg/L
|| || || || || || || || || || ||
Dissolved oxygen increases when the temperature __________ - correct
|| || || || || || || || ||
answer✔✔decreases
You can tell if a clarifier scraper arm is working by what means? - correct 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? - correct
|| || || || || || || || || || || || || || || || || || ||
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 - correct answer✔✔eutrophication
|| || || || || || || || || ||
eutrophication - correct answer✔✔aging and maturing of a body of water || || || || || || || || || ||
If the effluent from a treatment facility contained 5mg/L of BOD, what effect would this
|| || || || || || || || || || || || || || ||
have on the receiving stream? - correct answer✔✔little effect
|| || || || || || || ||
