Class C Water Operator License Exam
Questions And Correct Answers
Ammonia mixed with chlorine gas creates a
white smoke
The most difficult part of a water distribution operator's job.
furnish a continuous supply
Physical connection between a safe and potentially unsafe water source.
cross connection
A distribution system is a
looped system
Dead end mains should be flushed
every month
,Excess nitrate causes a condition called
blue baby syndrome
Water hardness is caused by
calcium and magnesium
Sewer mains should be __ft away from water mains.
9
Water with a pH less than 7 is considered to be
acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs.
5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time.
30
, Color in the water supply should be less than _____ units.
15
Chlorine is ______ times heavier than air.
2.5
90% of underground pipe failures are related to improper
backfill and bedding
The spoil bank should be located at least ___ft away from the ditch.
2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for
total chlorine.
.2, .5
Public opinion of the water utility is _______ at a standstill.
never
Questions And Correct Answers
Ammonia mixed with chlorine gas creates a
white smoke
The most difficult part of a water distribution operator's job.
furnish a continuous supply
Physical connection between a safe and potentially unsafe water source.
cross connection
A distribution system is a
looped system
Dead end mains should be flushed
every month
,Excess nitrate causes a condition called
blue baby syndrome
Water hardness is caused by
calcium and magnesium
Sewer mains should be __ft away from water mains.
9
Water with a pH less than 7 is considered to be
acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs.
5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time.
30
, Color in the water supply should be less than _____ units.
15
Chlorine is ______ times heavier than air.
2.5
90% of underground pipe failures are related to improper
backfill and bedding
The spoil bank should be located at least ___ft away from the ditch.
2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for
total chlorine.
.2, .5
Public opinion of the water utility is _______ at a standstill.
never
