ILLINOIS CLASS D WATER LICENSE EXAM (ACTUAL EXAM 2025) |
Illinois Class D Water License
ALL QUESTIONS AND CORRECT ANSWERS | VERIFIED ANSWERS |
Study online at https://quizlet.com/_en86ry
ALREADY GRADED A+ | LATEST EXAM
1. Two Towers are both 125 feet high, when Both will be equal
full, contain 122 feet of water. Tower
1 holds 150,000 gallons. Tower 2 holds
500,000 gallons. Each has a pressure
gauge at the base. Which will register the
most pressure in psi?
2. If the water level in tower 1 is 118 feet 51.1 psi
what will the pressure reading be at the
base
3. What is the definition of potable water Water that does not contain objectable pollu-
tion, contamination, or infective agents and is
considered safe for drinking
4. What is the first item used when installing Corporation stop
a service line to a customer?
5. If a meter to a residence is located in curb stop
the basement what should be located be-
tween the water main and the house
6. A 5/8" x 3/4" water meter serves a resi- Decreases
dence. Over a period of years the meter
__________ in recording actual water used
7. To isolate part of a distribution system Gate valve
what type of valve is commonly used?
8. Trihalomethanes (THMs) are caused by? Reaction of chlorinated water with numeric
materials found in surface water sources
9. Higher
, Illinois Class D Water License
Study online at https://quizlet.com/_en86ry
The longer the contact time water and
chlorine residuals enjoy the ________ the
THM level will probably be
10. THM's should be eliminated from finished Cancer
water because they cause ?
11. The maximum contaminant level for .080 mg/l
THM's is?
12. When collecting THM samples one sam- True
ple must be taken at a site where the
water has been in the distribution system
the longest time
13. An applicant for a class d test who 6 months
has graduated high school but has no
approved training credits must have
____________ "hands on" experience
14. What type of water main is most likely PVC
to become contaminated from gasoline
saturated soil
15. What type of materials must not be used Cinders
as backfill for water mains?
16. Nitrate in levels above _________ mg/L can 10
cause "blue baby" disease
17. A boil order must be issued if systems It is a regulation of the IEPA, and to protect
pressure drops below 20 psi or if conta- the health of water consumers
minated of any part of the system is sus-
pected. Why?
Illinois Class D Water License
ALL QUESTIONS AND CORRECT ANSWERS | VERIFIED ANSWERS |
Study online at https://quizlet.com/_en86ry
ALREADY GRADED A+ | LATEST EXAM
1. Two Towers are both 125 feet high, when Both will be equal
full, contain 122 feet of water. Tower
1 holds 150,000 gallons. Tower 2 holds
500,000 gallons. Each has a pressure
gauge at the base. Which will register the
most pressure in psi?
2. If the water level in tower 1 is 118 feet 51.1 psi
what will the pressure reading be at the
base
3. What is the definition of potable water Water that does not contain objectable pollu-
tion, contamination, or infective agents and is
considered safe for drinking
4. What is the first item used when installing Corporation stop
a service line to a customer?
5. If a meter to a residence is located in curb stop
the basement what should be located be-
tween the water main and the house
6. A 5/8" x 3/4" water meter serves a resi- Decreases
dence. Over a period of years the meter
__________ in recording actual water used
7. To isolate part of a distribution system Gate valve
what type of valve is commonly used?
8. Trihalomethanes (THMs) are caused by? Reaction of chlorinated water with numeric
materials found in surface water sources
9. Higher
, Illinois Class D Water License
Study online at https://quizlet.com/_en86ry
The longer the contact time water and
chlorine residuals enjoy the ________ the
THM level will probably be
10. THM's should be eliminated from finished Cancer
water because they cause ?
11. The maximum contaminant level for .080 mg/l
THM's is?
12. When collecting THM samples one sam- True
ple must be taken at a site where the
water has been in the distribution system
the longest time
13. An applicant for a class d test who 6 months
has graduated high school but has no
approved training credits must have
____________ "hands on" experience
14. What type of water main is most likely PVC
to become contaminated from gasoline
saturated soil
15. What type of materials must not be used Cinders
as backfill for water mains?
16. Nitrate in levels above _________ mg/L can 10
cause "blue baby" disease
17. A boil order must be issued if systems It is a regulation of the IEPA, and to protect
pressure drops below 20 psi or if conta- the health of water consumers
minated of any part of the system is sus-
pected. Why?
