D2 WATER DISTRIBUTION OPERATOR PRACTICE EXAM 2
TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) ALREADY PASSED!
Which process converts ammonia to nitrites and nitrates? Correct
Answers Nitrification
What is the maximum advisable rate of chlorine gas removal from a
150-pound cylinder? Correct Answers 40 lbs/day
Which of the following is a type of positive displacement water meter?
Correct Answers nutating-disk meter
__________ is a power-operated mechanism for opening and closing a
valve. Correct Answers actuator
What is required if a routine sample test positive for total coliform
bacteria? Correct Answers Take repeat samples
why is a grid layout better than a tree (branching) layout for a water
distribution system? Correct Answers less dead-end mains
What is the purpose of a reduced pressure principle assembly? Correct
Answers prevents back-pressure and back-siphonage
in general, at what depths is shoring required for a trench, if you're
excavating in soil? Correct Answers 5 feet or deeper
, What occurs after breakpoint chlorination is achieved? Correct Answers
Free available chlorine residual is directly proportional to the amount of
chlorine added
What is used to automatically shut off the flow into a tank when the
water level reaches a predetermined level? Correct Answers Altitude
valve
What could be used to find a chlorine gas leak, which produces white
smoke when it reacts with this substance? Correct Answers Spray
ammonia solution vapor near leak
What causes staining of plumbing fixtures? Correct Answers Iron and
manganese
How long should you flush the water before you collect a bactorialogical
sample? Correct Answers As long as necessary to flush stagnant water
from the service pipe
What is the purpose of a surge tank? Correct Answers Protect pipelines
from sudden high pressure
What is recommended if a chlorine gas cylinder is leaking? Correct
Answers Rotate the cylinder and turn the leak upwards
TEST WITH LATEST UPDATED (QUESTIONS AND
ANSWERS) ALREADY PASSED!
Which process converts ammonia to nitrites and nitrates? Correct
Answers Nitrification
What is the maximum advisable rate of chlorine gas removal from a
150-pound cylinder? Correct Answers 40 lbs/day
Which of the following is a type of positive displacement water meter?
Correct Answers nutating-disk meter
__________ is a power-operated mechanism for opening and closing a
valve. Correct Answers actuator
What is required if a routine sample test positive for total coliform
bacteria? Correct Answers Take repeat samples
why is a grid layout better than a tree (branching) layout for a water
distribution system? Correct Answers less dead-end mains
What is the purpose of a reduced pressure principle assembly? Correct
Answers prevents back-pressure and back-siphonage
in general, at what depths is shoring required for a trench, if you're
excavating in soil? Correct Answers 5 feet or deeper
, What occurs after breakpoint chlorination is achieved? Correct Answers
Free available chlorine residual is directly proportional to the amount of
chlorine added
What is used to automatically shut off the flow into a tank when the
water level reaches a predetermined level? Correct Answers Altitude
valve
What could be used to find a chlorine gas leak, which produces white
smoke when it reacts with this substance? Correct Answers Spray
ammonia solution vapor near leak
What causes staining of plumbing fixtures? Correct Answers Iron and
manganese
How long should you flush the water before you collect a bactorialogical
sample? Correct Answers As long as necessary to flush stagnant water
from the service pipe
What is the purpose of a surge tank? Correct Answers Protect pipelines
from sudden high pressure
What is recommended if a chlorine gas cylinder is leaking? Correct
Answers Rotate the cylinder and turn the leak upwards
