WATER DISTRIBUTION GRADE IV PRACTICE EXAM 3 QUESTIONS AND
ANSWERS
A couple test in a distribution system is used to (chose best answer) - CORRECT ANSWER✅✅Determine
scaling or corrosion rate
Normally, surface water & groundwater have a pH range of - CORRECT ANSWER✅✅6.8 to 8.5
A "competent person" must insect excavation & adjacent areas for hazards - CORRECT
ANSWER✅✅Daily, prior to the start or work, and as needed throughout the shift
Moderately hard has a range of ___________ mg/L as calcium carbonate - CORRECT ANSWER✅✅61 to
120
Common removal method for hydrogen sulfide from water - CORRECT ANSWER✅✅Aeration
Lead in drinking water can result in - CORRECT ANSWER✅✅Impaired mental functioning in children
Pump performance curve reflect - CORRECT ANSWER✅✅Pump horsepower
According to the AWWA what flow rate could be expected fro a "Red" fire hydrant? - CORRECT
ANSWER✅✅0 GPM - 500 GPM
A wharf hydrant nozzle is - CORRECT ANSWER✅✅2"
A noisy & vibrating gate valve indicates - CORRECT ANSWER✅✅Cavitation
Difference between Tier 1 and Tier 2 violations is - CORRECT ANSWER✅✅Tier 1 violations potentially
impose direct & adverse health effects; Tier 2 don't
, Devise used to measure distribution system flow - CORRECT ANSWER✅✅Pitot gauge
Chemical (s) in water supplies that can be harmful to a person's health when present in excess of
drinking water standards - CORRECT ANSWER✅✅Mercury
Pathogenic, water system, organisms causing disease outbreak - CORRECT ANSWER✅✅Giardia
Test kit used to determine chlorine residuals - CORRECT ANSWER✅✅DPD
Which color of fine hydrant would you expect to provide the best flow? - CORRECT ANSWER✅✅Blue
The accuracy for large water meters is - CORRECT ANSWER✅✅100 ± 3%
The spoil bile in a trench less than 4 ft should be placed - CORRECT ANSWER✅✅At least 2 ft from the
trench
Maximum spring for trench uprights is - CORRECT ANSWER✅✅8 ft
Water distribution system surveillance programs include - CORRECT ANSWER✅✅Storm Damage
The maximum concentration of chlorine that operators should be exposed to is - CORRECT
ANSWER✅✅1 PPM
The minimum number of samples in a repeat sample set of coliform is - CORRECT ANSWER✅✅3
Primary drinking water regulations require each public water system to maintain records of - CORRECT
ANSWER✅✅Actions taken to correct violations
Information shown on comprehensive maps - CORRECT ANSWER✅✅Hydrants, Wells, Valves &
Reservoirs
ANSWERS
A couple test in a distribution system is used to (chose best answer) - CORRECT ANSWER✅✅Determine
scaling or corrosion rate
Normally, surface water & groundwater have a pH range of - CORRECT ANSWER✅✅6.8 to 8.5
A "competent person" must insect excavation & adjacent areas for hazards - CORRECT
ANSWER✅✅Daily, prior to the start or work, and as needed throughout the shift
Moderately hard has a range of ___________ mg/L as calcium carbonate - CORRECT ANSWER✅✅61 to
120
Common removal method for hydrogen sulfide from water - CORRECT ANSWER✅✅Aeration
Lead in drinking water can result in - CORRECT ANSWER✅✅Impaired mental functioning in children
Pump performance curve reflect - CORRECT ANSWER✅✅Pump horsepower
According to the AWWA what flow rate could be expected fro a "Red" fire hydrant? - CORRECT
ANSWER✅✅0 GPM - 500 GPM
A wharf hydrant nozzle is - CORRECT ANSWER✅✅2"
A noisy & vibrating gate valve indicates - CORRECT ANSWER✅✅Cavitation
Difference between Tier 1 and Tier 2 violations is - CORRECT ANSWER✅✅Tier 1 violations potentially
impose direct & adverse health effects; Tier 2 don't
, Devise used to measure distribution system flow - CORRECT ANSWER✅✅Pitot gauge
Chemical (s) in water supplies that can be harmful to a person's health when present in excess of
drinking water standards - CORRECT ANSWER✅✅Mercury
Pathogenic, water system, organisms causing disease outbreak - CORRECT ANSWER✅✅Giardia
Test kit used to determine chlorine residuals - CORRECT ANSWER✅✅DPD
Which color of fine hydrant would you expect to provide the best flow? - CORRECT ANSWER✅✅Blue
The accuracy for large water meters is - CORRECT ANSWER✅✅100 ± 3%
The spoil bile in a trench less than 4 ft should be placed - CORRECT ANSWER✅✅At least 2 ft from the
trench
Maximum spring for trench uprights is - CORRECT ANSWER✅✅8 ft
Water distribution system surveillance programs include - CORRECT ANSWER✅✅Storm Damage
The maximum concentration of chlorine that operators should be exposed to is - CORRECT
ANSWER✅✅1 PPM
The minimum number of samples in a repeat sample set of coliform is - CORRECT ANSWER✅✅3
Primary drinking water regulations require each public water system to maintain records of - CORRECT
ANSWER✅✅Actions taken to correct violations
Information shown on comprehensive maps - CORRECT ANSWER✅✅Hydrants, Wells, Valves &
Reservoirs
