WATER DISTRIBUTION GRADE IV - PRACTICE EXAM 4
TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) ALREADY PASSED!
Disease(s) that might be transferred through water Correct Answers
Typhoid
Average percentage range of unaccounted for water in a fully metered
system Correct Answers 11% to 15%
When pumping rate is increase, cone of depression Correct Answers
Increases
Primary origin of coliform and water supplies Correct Answers Fecal
contamination by warm blooded animals
Primary THM source in drinking water Correct Answers Chlorine
reaction with organic matter
And air-gap device is used to Correct Answers Prevent black flow of a
non-portable water into a drinking water supply
Primary health risk associated with trihalomethane Correct Answers
Cancer
Water pH may be reduced by adding Correct Answers Carbon dioxide
, Proper alignment between two shafts can be checked using a Correct
Answers Straight edge and feeler gauge
So fundamental treatment requirements for public water systems using
surface water sources Correct Answers Disinfection and filtration
The MCL for total trihalomethanes is Correct Answers 0.08 mg/L
An amperometric titration measures Correct Answers Chlorine residual
As direct water connection to a boiler containing a scale prevention
compound must be protected by a Correct Answers Air gap
One way of disinfecting a water storage tank interior is to spray with
__________ mg/L chlorine Correct Answers 200
A centrifugal pump may be primed for use by a Correct Answers
Auxiliary water supply, Vacuum pump, Special Pump primer, Priming
water tank
Possible cause(s) of excessive pump vibration or noise Correct Answers
Inlet of suction pipe insufficiently submerged, Suction lift too high,
Misalignment, Operation at very low capacity
TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) ALREADY PASSED!
Disease(s) that might be transferred through water Correct Answers
Typhoid
Average percentage range of unaccounted for water in a fully metered
system Correct Answers 11% to 15%
When pumping rate is increase, cone of depression Correct Answers
Increases
Primary origin of coliform and water supplies Correct Answers Fecal
contamination by warm blooded animals
Primary THM source in drinking water Correct Answers Chlorine
reaction with organic matter
And air-gap device is used to Correct Answers Prevent black flow of a
non-portable water into a drinking water supply
Primary health risk associated with trihalomethane Correct Answers
Cancer
Water pH may be reduced by adding Correct Answers Carbon dioxide
, Proper alignment between two shafts can be checked using a Correct
Answers Straight edge and feeler gauge
So fundamental treatment requirements for public water systems using
surface water sources Correct Answers Disinfection and filtration
The MCL for total trihalomethanes is Correct Answers 0.08 mg/L
An amperometric titration measures Correct Answers Chlorine residual
As direct water connection to a boiler containing a scale prevention
compound must be protected by a Correct Answers Air gap
One way of disinfecting a water storage tank interior is to spray with
__________ mg/L chlorine Correct Answers 200
A centrifugal pump may be primed for use by a Correct Answers
Auxiliary water supply, Vacuum pump, Special Pump primer, Priming
water tank
Possible cause(s) of excessive pump vibration or noise Correct Answers
Inlet of suction pipe insufficiently submerged, Suction lift too high,
Misalignment, Operation at very low capacity
