LLINOIS CLASS D WATER LICENSE TEST 2025 NEWEST ACTUAL
EXAM CURRENTLY TESTING COMPLETE EXAM
Two Towers are both 125 feet high, when 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? -
Answer--Both will be equal
If the water level in tower 1 is 118 feet what will the pressure reading be at the
base -
Answer--51.1 psi
What is the definition of potable water -
Answer--Water that does not contain objectable pollution, contamination, or infective
agents and is considered safe for drinking
What is the first item used when installing a service line to a customer? -
Answer--Corporation stop
If a meter to a residence is located in the basement what should be located
between the water main and the house -
Answer--curb stop
A 5/8" x 3/4" water meter serves a residence. Over a period of years the meter
in recording actual water used -
Answer--Decreases
To isolate part of a distribution system what type of valve is commonly used? -
Answer--Gate valve
Trihalomethanes (THMs) are caused by? -
Answer--Reaction of chlorinated water with numeric materials found in surface water
sources
The longer the contact time water and chlorine residuals enjoy the the
THM level will probably be -
Answer--Higher
THM's should be eliminated from finished water because they cause ? -
Answer--Cancer
The maximum contaminant level for THM's is? -
Answer--.080 mg/l
When collecting THM samples one sample must be taken at a site where the
water has been in the distribution system the longest time -
Answer--True
An applicant for a class d test who has graduated high school but has no
approved training credits must have "hands on" experience -
Answer--6 months
, What type of water main is most likely to become contaminated from gasoline
saturated soil -
Answer--PVC
EXAM CURRENTLY TESTING COMPLETE EXAM
Two Towers are both 125 feet high, when 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? -
Answer--Both will be equal
If the water level in tower 1 is 118 feet what will the pressure reading be at the
base -
Answer--51.1 psi
What is the definition of potable water -
Answer--Water that does not contain objectable pollution, contamination, or infective
agents and is considered safe for drinking
What is the first item used when installing a service line to a customer? -
Answer--Corporation stop
If a meter to a residence is located in the basement what should be located
between the water main and the house -
Answer--curb stop
A 5/8" x 3/4" water meter serves a residence. Over a period of years the meter
in recording actual water used -
Answer--Decreases
To isolate part of a distribution system what type of valve is commonly used? -
Answer--Gate valve
Trihalomethanes (THMs) are caused by? -
Answer--Reaction of chlorinated water with numeric materials found in surface water
sources
The longer the contact time water and chlorine residuals enjoy the the
THM level will probably be -
Answer--Higher
THM's should be eliminated from finished water because they cause ? -
Answer--Cancer
The maximum contaminant level for THM's is? -
Answer--.080 mg/l
When collecting THM samples one sample must be taken at a site where the
water has been in the distribution system the longest time -
Answer--True
An applicant for a class d test who has graduated high school but has no
approved training credits must have "hands on" experience -
Answer--6 months
, What type of water main is most likely to become contaminated from gasoline
saturated soil -
Answer--PVC
