ELC 2023 COMPLETE GUIDE 140 Ans- minimum required pressure in a water distribution system is _____ kpa top Ans- Where should an air release valve be placed on a water main? 0.05 Ans- What is the free cl2 residual that would be reportable (adverse - AWQI) for a sample collected in the distribution ...
ELC 2023 COMPLETE GUIDE
140 Ans- minimum required pressure in a water distribution system is _____ kpa
top Ans- Where should an air release valve be placed on a water main?
0.05 Ans- What is the free cl2 residual that would be reportable (adverse - AWQI) for a sample collected
in the distribution system ? (mg/l)
full position Ans- When using a fire hydrant, the valve should be opened to the...
unsupported loose soil Ans- The angle of repose is the angle of slope of
pipe size, material, grade Ans- What affects the flow capacity of an installed pipeline?
0.2 Ans- The minimum acceptable free chlorine residual in the distribution system is ___ mg/l
loss of pressure Ans- Friction in a pipeline can cause
air gap Ans- Which of the following is approved to prevent backflow
8 Ans- Access ladders in a trench must be spaced such that workers are within ____ m of the ladder
less than Ans- At the same flow, friction losses through a 12-inch line are ____ through a 6-inch line.
floor Ans- . A chlorine feed room should be ventilated near the
hepatitis Ans- Operators working in a wastewater treatment plant should get the following shots
, decomposition of sulphides in the absence of oxygen Ans- Hydrogen Sulphide gas is generated from the
use self contained air, have help standing by Ans- What should an operator do when entering a room
containing a chlorine gas?
maximum allowable concentration Ans- The term MAC in ODWS refers to
atmosphere, safety equipment, barricades Ans- What must be checked prior to entering a man hole
explosion hazard Ans- Why are gasoline and volatile solvents objectionable when present in a sewer?
all chemicals used in workplace Ans- MSDS sheets are required for
flow rates higher than design flows Ans- Cavitation in pumps is caused by pumping
constant at a constant speed Ans- The discharge flow rate of a piston type pump is
install surge tank Ans- One method of minimizing water hammer is to
chain of custody Ans- What documentation must accompany all samples sent to a lab for water or
wastewater analysis
0.6 Ans- The minimum velocity in a sanitary sewer is _____m/s
turbidity Ans- What information is not required on a CoC for a water distribution sample sent to the lab.
for bacterial analysis (Total Coliforms, E. coli)
above the sanitary sewer Ans- If a water main and a sanitary sewer must be located in the same trench,
it is recommended that the water main be located
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