CAIB 4 EXAM NEWEST 2025 ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!!
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
, CAIB 4 EXAM NEWEST 2025 ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!!
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
What type of materials must not be used as backfill for water mains? -(ANSWER)Cinders
Nitrate in levels above _________ mg/L can cause "blue baby" disease -(ANSWER)10
A boil order must be issued if systems pressure drops below 20 psi or if contaminated of any part
of the system is suspected. Why? -(ANSWER)It is a regulation of the IEPA, and to protect the
health of water consumers
A boil order should be issued for? -(ANSWER)Until further notice
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!!
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
, CAIB 4 EXAM NEWEST 2025 ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED A+||BRAND NEW!!
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
What type of materials must not be used as backfill for water mains? -(ANSWER)Cinders
Nitrate in levels above _________ mg/L can cause "blue baby" disease -(ANSWER)10
A boil order must be issued if systems pressure drops below 20 psi or if contaminated of any part
of the system is suspected. Why? -(ANSWER)It is a regulation of the IEPA, and to protect the
health of water consumers
A boil order should be issued for? -(ANSWER)Until further notice
