WATER DISTRIBUTION PRACTICE EXAM 1 D1-
D2 WITH DETAILED ANSWERS
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 - answer-6 hours
Head is measured in - answer-height (feet) or
pressure
Which type of valve will prevent the collapse of
a pipe - answer-Air-and-vacuum relief valve
The highest degree of protection of a coated
steel pipe is.... - answer-cathodic protection
At which time of day is the age of the water
stored in the distribution system the
highest/oldest? - answer-In the morning
,One of chlorine advantages is that it - answer-
has a persistent residual
Chlorine gas is _____ times heavier than air. -
answer-2.5X
After a water storage tank has been
chlorinated, which bacteriological test must
prove negative before the tank is put back into
service. - answer-Coliform test
~~~~~~Which is the best and most reliable way
of finding a very small chlorine leak? - answer-
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 - answer-
a detectable level
, Samples collected for cloakrooms are collected
in plastic bottles that must contain - answer-
Sodium thiosulfate
The volume of a sample for coliform compliance
is - answer-100 ml
If a water sample is not analyzed immediately
for chlorine residual, it is acceptable to be
analyzed within - answer-15 minutes
The heart of a pump is called the - answer-
impeller
Which device serves the same function as the
packing - answer-Mechanical seal
Which is used to stop air leakage into the casing
around the pump shaft - answer-seals
Which is at the top of a stuffing box? - answer-
Packing gland
D2 WITH DETAILED ANSWERS
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 - answer-6 hours
Head is measured in - answer-height (feet) or
pressure
Which type of valve will prevent the collapse of
a pipe - answer-Air-and-vacuum relief valve
The highest degree of protection of a coated
steel pipe is.... - answer-cathodic protection
At which time of day is the age of the water
stored in the distribution system the
highest/oldest? - answer-In the morning
,One of chlorine advantages is that it - answer-
has a persistent residual
Chlorine gas is _____ times heavier than air. -
answer-2.5X
After a water storage tank has been
chlorinated, which bacteriological test must
prove negative before the tank is put back into
service. - answer-Coliform test
~~~~~~Which is the best and most reliable way
of finding a very small chlorine leak? - answer-
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 - answer-
a detectable level
, Samples collected for cloakrooms are collected
in plastic bottles that must contain - answer-
Sodium thiosulfate
The volume of a sample for coliform compliance
is - answer-100 ml
If a water sample is not analyzed immediately
for chlorine residual, it is acceptable to be
analyzed within - answer-15 minutes
The heart of a pump is called the - answer-
impeller
Which device serves the same function as the
packing - answer-Mechanical seal
Which is used to stop air leakage into the casing
around the pump shaft - answer-seals
Which is at the top of a stuffing box? - answer-
Packing gland
