Class C Water Operator License Exam
questions with correct answers
Ammonia mixed with chlorine gas creates a - ** VERIFIED ANSWERS **✔✔white smoke
The most difficult part of a water distribution operator's job. - ** VERIFIED ANSWERS
**✔✔furnish a continuous supply
Physical connection between a safe and potentially unsafe water source. - ** VERIFIED
ANSWERS **✔✔cross connection
A distribution system is a - ** VERIFIED ANSWERS **✔✔looped system
Dead end mains should be flushed - ** VERIFIED ANSWERS **✔✔every month
Excess nitrate causes a condition called - ** VERIFIED ANSWERS **✔✔blue baby
syndrome
Water hardness is caused by - ** VERIFIED ANSWERS **✔✔calcium and magnesium
Sewer mains should be __ft away from water mains. - ** VERIFIED ANSWERS **✔✔9
Water with a pH less than 7 is considered to be - ** VERIFIED ANSWERS **✔✔acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - ** VERIFIED
ANSWERS **✔✔5, 10
, Bacti samples have to be returned to the lab within ___hrs of the collection time. - **
VERIFIED ANSWERS **✔✔30
Color in the water supply should be less than _____ units. - ** VERIFIED ANSWERS
**✔✔15
Chlorine is ______ times heavier than air. - ** VERIFIED ANSWERS **✔✔2.5
90% of underground pipe failures are related to improper - ** VERIFIED ANSWERS
**✔✔backfill and bedding
The spoil bank should be located at least ___ft away from the ditch. - ** VERIFIED
ANSWERS **✔✔2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - ** VERIFIED ANSWERS **✔✔.2, .5
Public opinion of the water utility is _______ at a standstill. - ** VERIFIED ANSWERS
**✔✔never
A bacti sample should be taken every ____ft of pipe. - ** VERIFIED ANSWERS **✔✔1000
The most common collection point for a bacti sample is the water tap _______. - **
VERIFIED ANSWERS **✔✔outside the house
A standpipe is considered ground storage unless it exceeds _____ft above the highest
________. - ** VERIFIED ANSWERS **✔✔80, service connection
________ protection is the electrochemical method for preventing ________ of metal tanks.
- ** VERIFIED ANSWERS **✔✔cathodic, corrosion
questions with correct answers
Ammonia mixed with chlorine gas creates a - ** VERIFIED ANSWERS **✔✔white smoke
The most difficult part of a water distribution operator's job. - ** VERIFIED ANSWERS
**✔✔furnish a continuous supply
Physical connection between a safe and potentially unsafe water source. - ** VERIFIED
ANSWERS **✔✔cross connection
A distribution system is a - ** VERIFIED ANSWERS **✔✔looped system
Dead end mains should be flushed - ** VERIFIED ANSWERS **✔✔every month
Excess nitrate causes a condition called - ** VERIFIED ANSWERS **✔✔blue baby
syndrome
Water hardness is caused by - ** VERIFIED ANSWERS **✔✔calcium and magnesium
Sewer mains should be __ft away from water mains. - ** VERIFIED ANSWERS **✔✔9
Water with a pH less than 7 is considered to be - ** VERIFIED ANSWERS **✔✔acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - ** VERIFIED
ANSWERS **✔✔5, 10
, Bacti samples have to be returned to the lab within ___hrs of the collection time. - **
VERIFIED ANSWERS **✔✔30
Color in the water supply should be less than _____ units. - ** VERIFIED ANSWERS
**✔✔15
Chlorine is ______ times heavier than air. - ** VERIFIED ANSWERS **✔✔2.5
90% of underground pipe failures are related to improper - ** VERIFIED ANSWERS
**✔✔backfill and bedding
The spoil bank should be located at least ___ft away from the ditch. - ** VERIFIED
ANSWERS **✔✔2
The following minimum residuals is ______mg/L for free chlorine and ____mg/L for total
chlorine. - ** VERIFIED ANSWERS **✔✔.2, .5
Public opinion of the water utility is _______ at a standstill. - ** VERIFIED ANSWERS
**✔✔never
A bacti sample should be taken every ____ft of pipe. - ** VERIFIED ANSWERS **✔✔1000
The most common collection point for a bacti sample is the water tap _______. - **
VERIFIED ANSWERS **✔✔outside the house
A standpipe is considered ground storage unless it exceeds _____ft above the highest
________. - ** VERIFIED ANSWERS **✔✔80, service connection
________ protection is the electrochemical method for preventing ________ of metal tanks.
- ** VERIFIED ANSWERS **✔✔cathodic, corrosion
