Class C Water Operator License Exam Questions With Complete Solutions
Ammonia mixed with chlorine gas creates a - (ANSWER)white smoke
The most difficult part of a water distribution operator's job. - (ANSWER)furnish a continuous supply
Physical connection between a safe and potentially unsafe water source. - (ANSWER)cross connection
A distribution system is a - (ANSWER)looped system
Dead end mains should be flushed - (ANSWER)every month
Excess nitrate causes a condition called - (ANSWER)blue baby syndrome
Water hardness is caused by - (ANSWER)calcium and magnesium
Sewer mains should be __ft away from water mains. - (ANSWER)9
Water with a pH less than 7 is considered to be - (ANSWER)acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - (ANSWER)5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time. - (ANSWER)30
Color in the water supply should be less than _____ units. - (ANSWER)15
Chlorine is ______ times heavier than air. - (ANSWER)2.5
90% of underground pipe failures are related to improper - (ANSWER)backfill and bedding
, Class C Water Operator License Exam Questions With Complete Solutions
The spoil bank should be located at least ___ft away from the ditch. - (ANSWER)2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total chlorine. -
(ANSWER).2, .5
Public opinion of the water utility is _______ at a standstill. - (ANSWER)never
A bacti sample should be taken every ____ft of pipe. - (ANSWER)1000
The most common collection point for a bacti sample is the water tap _______. - (ANSWER)outside the
house
A standpipe is considered ground storage unless it exceeds _____ft above the highest ________. -
(ANSWER)80, service connection
________ protection is the electrochemical method for preventing ________ of metal tanks. -
(ANSWER)cathodic, corrosion
The _____ is the only cross connection control method approved by _______. - (ANSWER)air gap, tceq
_______ on a pipeline depend on the _____ or coefficient of pipe roughness. - (ANSWER)friction loss, c
factor
__________ occurs whenever there is a ______ in the velocity or direction of water flow. -
(ANSWER)water hammer, sudden change
The ______ water pressure required by the rules and regulations is ____psi under any and all conditions.
- (ANSWER)minimum, 20
100, 150, 200 and 250 are approved classes of _____ _____. - (ANSWER)working pressure
Ammonia mixed with chlorine gas creates a - (ANSWER)white smoke
The most difficult part of a water distribution operator's job. - (ANSWER)furnish a continuous supply
Physical connection between a safe and potentially unsafe water source. - (ANSWER)cross connection
A distribution system is a - (ANSWER)looped system
Dead end mains should be flushed - (ANSWER)every month
Excess nitrate causes a condition called - (ANSWER)blue baby syndrome
Water hardness is caused by - (ANSWER)calcium and magnesium
Sewer mains should be __ft away from water mains. - (ANSWER)9
Water with a pH less than 7 is considered to be - (ANSWER)acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - (ANSWER)5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time. - (ANSWER)30
Color in the water supply should be less than _____ units. - (ANSWER)15
Chlorine is ______ times heavier than air. - (ANSWER)2.5
90% of underground pipe failures are related to improper - (ANSWER)backfill and bedding
, Class C Water Operator License Exam Questions With Complete Solutions
The spoil bank should be located at least ___ft away from the ditch. - (ANSWER)2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total chlorine. -
(ANSWER).2, .5
Public opinion of the water utility is _______ at a standstill. - (ANSWER)never
A bacti sample should be taken every ____ft of pipe. - (ANSWER)1000
The most common collection point for a bacti sample is the water tap _______. - (ANSWER)outside the
house
A standpipe is considered ground storage unless it exceeds _____ft above the highest ________. -
(ANSWER)80, service connection
________ protection is the electrochemical method for preventing ________ of metal tanks. -
(ANSWER)cathodic, corrosion
The _____ is the only cross connection control method approved by _______. - (ANSWER)air gap, tceq
_______ on a pipeline depend on the _____ or coefficient of pipe roughness. - (ANSWER)friction loss, c
factor
__________ occurs whenever there is a ______ in the velocity or direction of water flow. -
(ANSWER)water hammer, sudden change
The ______ water pressure required by the rules and regulations is ____psi under any and all conditions.
- (ANSWER)minimum, 20
100, 150, 200 and 250 are approved classes of _____ _____. - (ANSWER)working pressure
