Class D Water Exam Illinois questions|\ |\ |\ |\ |\ |\
with answers |\
For a water storage tank, cathodic protection is only
|\ |\ |\ |\ |\ |\ |\ |\ |\
effective for the: - CORRECT ANSWERS ✔✔tank areas
|\ |\ |\ |\ |\ |\ |\ |\
covered by water |\ |\
For a water storage system, the purpose of an altitude
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
valve is to prevent: - CORRECT ANSWERS ✔✔overflows
|\ |\ |\ |\ |\ |\ |\
Before using a water storage tank that has been
|\ |\ |\ |\ |\ |\ |\ |\ |\
disinfected, water from the tank must not show the |\ |\ |\ |\ |\ |\ |\ |\ |\
presense of: - CORRECT ANSWERS ✔✔coliforms |\ |\ |\ |\ |\
High trihalomethane (THMs) levels may cause: - CORRECT
|\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔cancer
|\ |\
A finished water with a negative Langelier Index may be: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔corrosive
|\ |\ |\
Water with pH scale less than 7 is considered: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔acidic |\
,pH scale of 7 is considered - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔neutral
pH scale of 8-14 is considered? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔basic
How many gallons of water are in 1 cubic ft? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔7.48 gallons |\ |\
How many gallons of water are in 15 cubic ft? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔15 x 7.48 = 112.2 gallons |\ |\ |\ |\ |\ |\
How many cubic ft of water is 20 gallons? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔20/7.48 = 2.67 cubic ft |\ |\ |\ |\ |\
1 gallon of water equals how many lbs? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔8.34 lbs |\ |\
16 gallons of water is how many lbs? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔16 x 8.34 = 133.44 lbs |\ |\ |\ |\ |\ |\
A 180 ft water tower would show what psi on the gauge
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
located at the base? - CORRECT ANSWERS ✔✔180/ 2.31
|\ |\ |\ |\ |\ |\ |\ |\ |\
= 77.92 psi
|\ |\
, Pump cavitation is most likely to occur when: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔the top of the water source level is lower |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
than the impeller |\ |\
1 pound per square inch is equal to how many feet of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
elevated water? - CORRECT ANSWERS ✔✔2.31 feet |\ |\ |\ |\ |\ |\
For most centrifugal pumps, if the total dyanmic head
|\ |\ |\ |\ |\ |\ |\ |\ |\
decreases, the pump will: - CORRECT ANSWERS ✔✔pump |\ |\ |\ |\ |\ |\ |\ |\
water at a faster rate in gpm. (less head to push against)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
The velocity of water is measure in: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔Feet per Second
|\ |\ |\ |\
Distance (feet)/Time (sec) |\ |\
When water lines in a distribution system are installed
|\ |\ |\ |\ |\ |\ |\ |\ |\
parallel to sewer lines, they should be located how far
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
apart from the sewer lines? - CORRECT ANSWERS ✔✔10 ft
|\ |\ |\ |\ |\ |\ |\ |\ |\
Air relief valves in the distribution system should be
|\ |\ |\ |\ |\ |\ |\ |\ |\
located where? - CORRECT ANSWERS ✔✔at the high point
|\ |\ |\ |\ |\ |\ |\ |\
on a main
|\ |\ |\
with answers |\
For a water storage tank, cathodic protection is only
|\ |\ |\ |\ |\ |\ |\ |\ |\
effective for the: - CORRECT ANSWERS ✔✔tank areas
|\ |\ |\ |\ |\ |\ |\ |\
covered by water |\ |\
For a water storage system, the purpose of an altitude
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
valve is to prevent: - CORRECT ANSWERS ✔✔overflows
|\ |\ |\ |\ |\ |\ |\
Before using a water storage tank that has been
|\ |\ |\ |\ |\ |\ |\ |\ |\
disinfected, water from the tank must not show the |\ |\ |\ |\ |\ |\ |\ |\ |\
presense of: - CORRECT ANSWERS ✔✔coliforms |\ |\ |\ |\ |\
High trihalomethane (THMs) levels may cause: - CORRECT
|\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔cancer
|\ |\
A finished water with a negative Langelier Index may be: -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔corrosive
|\ |\ |\
Water with pH scale less than 7 is considered: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔acidic |\
,pH scale of 7 is considered - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔neutral
pH scale of 8-14 is considered? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔basic
How many gallons of water are in 1 cubic ft? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔7.48 gallons |\ |\
How many gallons of water are in 15 cubic ft? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔15 x 7.48 = 112.2 gallons |\ |\ |\ |\ |\ |\
How many cubic ft of water is 20 gallons? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔20/7.48 = 2.67 cubic ft |\ |\ |\ |\ |\
1 gallon of water equals how many lbs? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔8.34 lbs |\ |\
16 gallons of water is how many lbs? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔16 x 8.34 = 133.44 lbs |\ |\ |\ |\ |\ |\
A 180 ft water tower would show what psi on the gauge
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
located at the base? - CORRECT ANSWERS ✔✔180/ 2.31
|\ |\ |\ |\ |\ |\ |\ |\ |\
= 77.92 psi
|\ |\
, Pump cavitation is most likely to occur when: - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔the top of the water source level is lower |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
than the impeller |\ |\
1 pound per square inch is equal to how many feet of
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
elevated water? - CORRECT ANSWERS ✔✔2.31 feet |\ |\ |\ |\ |\ |\
For most centrifugal pumps, if the total dyanmic head
|\ |\ |\ |\ |\ |\ |\ |\ |\
decreases, the pump will: - CORRECT ANSWERS ✔✔pump |\ |\ |\ |\ |\ |\ |\ |\
water at a faster rate in gpm. (less head to push against)
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
The velocity of water is measure in: - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔Feet per Second
|\ |\ |\ |\
Distance (feet)/Time (sec) |\ |\
When water lines in a distribution system are installed
|\ |\ |\ |\ |\ |\ |\ |\ |\
parallel to sewer lines, they should be located how far
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
apart from the sewer lines? - CORRECT ANSWERS ✔✔10 ft
|\ |\ |\ |\ |\ |\ |\ |\ |\
Air relief valves in the distribution system should be
|\ |\ |\ |\ |\ |\ |\ |\ |\
located where? - CORRECT ANSWERS ✔✔at the high point
|\ |\ |\ |\ |\ |\ |\ |\
on a main
|\ |\ |\
