Water Distribution 1 Exam
Questions And Correct Answers
Head is measured in
feet
A plat is
A map
Which type of valve will prevent the collapse of a pipe
Air-and-vaccume relief valve
The highest degree of protection of a coated steel pipe is
cathodic protection
At which time of day is the age of the water stored in the distribution system the
highest?
In the morning
,One of chlorines advantages is that it
has a persistent residual
Chlorine gas is _____ times heavier than air.
2.5
After a water storage tank has been chlorinated, which bacteriological test must prove
negative before the tank is put back into service.
Coliform test
Which is the best and most reliable way of finding a very small chlorine leak?
Use a chlorine gas detector and place it near any area suspected of leaking.
The minimum required free chlorine residual anywhere in the distribution system is
a detectable level
First draw samples for the analysis of lead and copper water must be collected from
taps where the water has stood motionless in the plumbing for at least
6 hours
, Samples collected for cloakrooms are collected in plastic bottles that must contain
Sodium thiosulfate
The volume of a sample for coliform compliance is
100 ml
If a water sample is not analyzed immediately for chlorine residual, it is acceptable to
be analyzed within
15 minutes
The heart of a pump is called the
impeller
Which device serves the same function as the packing
Mechanical seal
Which is used to stop air leakage into the casing around the pump shaft
Questions And Correct Answers
Head is measured in
feet
A plat is
A map
Which type of valve will prevent the collapse of a pipe
Air-and-vaccume relief valve
The highest degree of protection of a coated steel pipe is
cathodic protection
At which time of day is the age of the water stored in the distribution system the
highest?
In the morning
,One of chlorines advantages is that it
has a persistent residual
Chlorine gas is _____ times heavier than air.
2.5
After a water storage tank has been chlorinated, which bacteriological test must prove
negative before the tank is put back into service.
Coliform test
Which is the best and most reliable way of finding a very small chlorine leak?
Use a chlorine gas detector and place it near any area suspected of leaking.
The minimum required free chlorine residual anywhere in the distribution system is
a detectable level
First draw samples for the analysis of lead and copper water must be collected from
taps where the water has stood motionless in the plumbing for at least
6 hours
, Samples collected for cloakrooms are collected in plastic bottles that must contain
Sodium thiosulfate
The volume of a sample for coliform compliance is
100 ml
If a water sample is not analyzed immediately for chlorine residual, it is acceptable to
be analyzed within
15 minutes
The heart of a pump is called the
impeller
Which device serves the same function as the packing
Mechanical seal
Which is used to stop air leakage into the casing around the pump shaft
