WATER OPERATOR LICENSE EXAM
2026 CLASS C QUESTIONS AND
DETAILED CORRECT ANSWERS | A+
GRADE VERIFIED ANSWERS
________ protection is the electrochemical method for
preventing ________ of metal tanks. Correct Answer
cathodic, corrosion
The _____ is the only cross connection control method
approved by _______. Correct Answer air gap, tceq
_______ on a pipeline depend on the _____ or coefficient
of pipe roughness. Correct Answer friction loss, c factor
__________ occurs whenever there is a ______ in the
velocity or direction of water flow. Correct Answer water
hammer, sudden change
The ______ water pressure required by the rules and
regulations is ____psi under any and all conditions.
Correct Answer minimum, 20
100, 150, 200 and 250 are approved classes of _____
_____. Correct Answer working pressure
______ is used to anchor pipe bends. Correct Answer
concrete
, A general deposit of mineral particles evenly along the
inside of the pipe is ________. Correct Answer
tuberculation
Shoring should be used if a ditch is ___ft or deeper.
Correct Answer 5
A written sample writing plan is required for _______
monitoring. Correct Answer coliform
Ladders should be placed every ___ft in a ditch. Correct
Answer 25
An oxygen deficient atmosphere is defined as one which
contains _____ than ______ % oxygen. Correct Answer
less, 19.5
Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________. Correct
Answer increases, decreases
The operator should leave a ________ of slack in flexible
tubing. Correct Answer gooseneck
The most common type of water meter is the ____ ____
meter. Correct Answer positive displacement
Safe withdrawal weight from a 150lb cylinder is ___lbs and
400lbs from a ____ton cylinder. Correct Answer 40, 1
2026 CLASS C QUESTIONS AND
DETAILED CORRECT ANSWERS | A+
GRADE VERIFIED ANSWERS
________ protection is the electrochemical method for
preventing ________ of metal tanks. Correct Answer
cathodic, corrosion
The _____ is the only cross connection control method
approved by _______. Correct Answer air gap, tceq
_______ on a pipeline depend on the _____ or coefficient
of pipe roughness. Correct Answer friction loss, c factor
__________ occurs whenever there is a ______ in the
velocity or direction of water flow. Correct Answer water
hammer, sudden change
The ______ water pressure required by the rules and
regulations is ____psi under any and all conditions.
Correct Answer minimum, 20
100, 150, 200 and 250 are approved classes of _____
_____. Correct Answer working pressure
______ is used to anchor pipe bends. Correct Answer
concrete
, A general deposit of mineral particles evenly along the
inside of the pipe is ________. Correct Answer
tuberculation
Shoring should be used if a ditch is ___ft or deeper.
Correct Answer 5
A written sample writing plan is required for _______
monitoring. Correct Answer coliform
Ladders should be placed every ___ft in a ditch. Correct
Answer 25
An oxygen deficient atmosphere is defined as one which
contains _____ than ______ % oxygen. Correct Answer
less, 19.5
Characteristics of a Centrifugal Pump:
as the head _____ the discharge ________. Correct
Answer increases, decreases
The operator should leave a ________ of slack in flexible
tubing. Correct Answer gooseneck
The most common type of water meter is the ____ ____
meter. Correct Answer positive displacement
Safe withdrawal weight from a 150lb cylinder is ___lbs and
400lbs from a ____ton cylinder. Correct Answer 40, 1
