WATER DISTRIBUTION PRACTICE EXAM #2 (D1-D2) TEST
WITH LATEST UPDATED (QUESTIONS AND ANSWERS)
ALREADY PASSED!
Which process converts ammonia to nitrite and nitrate? Correct Answers
Nitrification
What is the maximum advisable rate of chlorine gas removal from a
150- pound cylinder? Correct Answers 40 pounds per day
What is a type of positive displacement water meter? Correct Answers
Nutating- disk meter
What 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 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 pre-determined level? Correct Answers Altitude
valve
What would 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 &
manganese
How long should you flush water before you collect a bacteriological
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
WITH LATEST UPDATED (QUESTIONS AND ANSWERS)
ALREADY PASSED!
Which process converts ammonia to nitrite and nitrate? Correct Answers
Nitrification
What is the maximum advisable rate of chlorine gas removal from a
150- pound cylinder? Correct Answers 40 pounds per day
What is a type of positive displacement water meter? Correct Answers
Nutating- disk meter
What 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 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 pre-determined level? Correct Answers Altitude
valve
What would 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 &
manganese
How long should you flush water before you collect a bacteriological
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
