Water distribution practice exam #2 (D1-D2) | Questions and Answers
Which process converts Nitrification
ammonia to nitrite and
nitrate?
What is the maximum 40 pounds per day
advisable rate of chlorine gas
removal from a 150- pound
cylinder?
What is a type of positive Nutating- disk meter
displacement water meter?
What is a power-operated Actuator
mechanism for opening and
closing a valve?
What is required if a routine Take repeat samples
sample test positive for total
coliform bacteria?
Why is a grid layout better Less dead-end mains
than a tree layout for a water
distribution system?
What is the purpose of a Prevents back-pressure and back-siphonage
reduced pressure principle
assembly?
, In general, at what depths is 5 feet or deeper
shoring required for a trench,
if you're excavating in soil?
What occurs after breakpoint Free available chlorine residual is directly proportional to the
chlorination is achieved? amount of chlorine added
What is used to automatically Altitude valve
shut-off the flow into a tank
when the water level
reaches a pre-determined
level?
What would be used to find a Spray ammonia solution vapor near leak
chlorine gas leak, which
produces white smoke when it
reacts with this substance?
What causes staining of Iron & manganese
plumbing fixtures?
How long should you flush As long as necessary to flush stagnant water from the service pipe
water before you collect a
bacteriological sample?
What is the purpose of a surge Protect pipelines from sudden high pressure
tank?
What is recommended if a Rotate the cylinder and turn the leak upwards
chlorine gas cylinder is
leaking?
What is the purpose of primary To protect human health
MCL?
What problem could be used by Corrosión
water with a pH of 5.3?
What is a common way to Wet tap or hot tap
connect a new pipe to an
existing pipe, while the latter
is pressurized and in-
service?
What impact would organics Increase chlorine demand
have on chlorine demand?
What is dichloramine? Combined chlorine residual
Which process converts Nitrification
ammonia to nitrite and
nitrate?
What is the maximum 40 pounds per day
advisable rate of chlorine gas
removal from a 150- pound
cylinder?
What is a type of positive Nutating- disk meter
displacement water meter?
What is a power-operated Actuator
mechanism for opening and
closing a valve?
What is required if a routine Take repeat samples
sample test positive for total
coliform bacteria?
Why is a grid layout better Less dead-end mains
than a tree layout for a water
distribution system?
What is the purpose of a Prevents back-pressure and back-siphonage
reduced pressure principle
assembly?
, In general, at what depths is 5 feet or deeper
shoring required for a trench,
if you're excavating in soil?
What occurs after breakpoint Free available chlorine residual is directly proportional to the
chlorination is achieved? amount of chlorine added
What is used to automatically Altitude valve
shut-off the flow into a tank
when the water level
reaches a pre-determined
level?
What would be used to find a Spray ammonia solution vapor near leak
chlorine gas leak, which
produces white smoke when it
reacts with this substance?
What causes staining of Iron & manganese
plumbing fixtures?
How long should you flush As long as necessary to flush stagnant water from the service pipe
water before you collect a
bacteriological sample?
What is the purpose of a surge Protect pipelines from sudden high pressure
tank?
What is recommended if a Rotate the cylinder and turn the leak upwards
chlorine gas cylinder is
leaking?
What is the purpose of primary To protect human health
MCL?
What problem could be used by Corrosión
water with a pH of 5.3?
What is a common way to Wet tap or hot tap
connect a new pipe to an
existing pipe, while the latter
is pressurized and in-
service?
What impact would organics Increase chlorine demand
have on chlorine demand?
What is dichloramine? Combined chlorine residual
