CLASS
CLASS C WATER OPERATOR LICENSE
EXAM QUESTIONS AND ANSWERS
UPDATED (2024/2025) (VERIFIED
ANSWERS)
100, 150, 200 and 250 are approved classes of _____ _____. - ANS ✓working
pressure
______ is used to anchor pipe bends. - ANS ✓concrete
A general deposit of mineral particles evenly along the inside of the pipe is
________. - ANS ✓tuberculation
Shoring should be used if a ditch is ___ft or deeper. - ANS ✓5
A written sample writing plan is required for _______ monitoring. - ANS
✓coliform
Ladders should be placed every ___ft in a ditch. - ANS ✓25
An oxygen deficient atmosphere is defined as one which contains _____ than
______ % oxygen. - ANS ✓less, 19.5
Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________. - ANS ✓increases, decreases
1
CLASS C
, CLASS
The operator should leave a ________ of slack in flexible tubing. - ANS
✓gooseneck
The most common type of water meter is the ____ ____ meter. - ANS ✓positive
displacement
Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a
____ton cylinder. - ANS ✓40, 1
The most common valve is the _______. - ANS ✓gate valve
The most commonly used fire hydrants used in distribution systems are the
_________. - ANS ✓dry barrel
Hydrants have a _____ point in case the hydrant is struck by a vehicle. - ANS
✓breakaway
Controlling valves regulate pressure flow ____ and flow _______. - ANS ✓rates,
direction
Electricity is the preferred power source for most distribution systems
because of ______, reliability and relatively low _______. - ANS ✓availability, cost
5/8 meters need to be tested at least every _____ to _______ yrs. - ANS ✓5, 10
When disinfecting a water line, use ____mg/L of chlorine in the main and let
stand for ____hrs. - ANS ✓50, 24
When pressure testing the water main, the test pressure should be ___times
as great as the ________ operating pressure. - ANS ✓1.5, normal
2
CLASS C
CLASS C WATER OPERATOR LICENSE
EXAM QUESTIONS AND ANSWERS
UPDATED (2024/2025) (VERIFIED
ANSWERS)
100, 150, 200 and 250 are approved classes of _____ _____. - ANS ✓working
pressure
______ is used to anchor pipe bends. - ANS ✓concrete
A general deposit of mineral particles evenly along the inside of the pipe is
________. - ANS ✓tuberculation
Shoring should be used if a ditch is ___ft or deeper. - ANS ✓5
A written sample writing plan is required for _______ monitoring. - ANS
✓coliform
Ladders should be placed every ___ft in a ditch. - ANS ✓25
An oxygen deficient atmosphere is defined as one which contains _____ than
______ % oxygen. - ANS ✓less, 19.5
Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________. - ANS ✓increases, decreases
1
CLASS C
, CLASS
The operator should leave a ________ of slack in flexible tubing. - ANS
✓gooseneck
The most common type of water meter is the ____ ____ meter. - ANS ✓positive
displacement
Safe withdrawal weight from a 150lb cylinder is ___lbs and 400lbs from a
____ton cylinder. - ANS ✓40, 1
The most common valve is the _______. - ANS ✓gate valve
The most commonly used fire hydrants used in distribution systems are the
_________. - ANS ✓dry barrel
Hydrants have a _____ point in case the hydrant is struck by a vehicle. - ANS
✓breakaway
Controlling valves regulate pressure flow ____ and flow _______. - ANS ✓rates,
direction
Electricity is the preferred power source for most distribution systems
because of ______, reliability and relatively low _______. - ANS ✓availability, cost
5/8 meters need to be tested at least every _____ to _______ yrs. - ANS ✓5, 10
When disinfecting a water line, use ____mg/L of chlorine in the main and let
stand for ____hrs. - ANS ✓50, 24
When pressure testing the water main, the test pressure should be ___times
as great as the ________ operating pressure. - ANS ✓1.5, normal
2
CLASS C
