Water Distribution 1 Final exam
questions and answers 100% verified
Il`
Head is measured in - CORRECT ANSWER-feet
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A plat is - CORRECT ANSWER-A map
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Which type of valve will prevent the collapse of a pipe - CORRECT ANSWER-Air-and-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
vaccume relief valve
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Il` Il`
The highest degree of protection of a coated steel pipe is - CORRECT ANSWER-
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Il`
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cathodic protection
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At which time of day is the age of the water stored in the distribution system the
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highest? - CORRECT ANSWER-In the morning
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One of chlorines advantages is that it - CORRECT ANSWER-has a persistent residual
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Chlorine gas is _____ times heavier than air. - CORRECT ANSWER-2.5
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After a water storage tank has been chlorinated, which bacteriological test must prove
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negative before the tank is put back into service. - CORRECT ANSWER-Coliform test
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Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Which is the best and most reliable way of finding a very small chlorine leak? -
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CORRECT ANSWER-Use a chlorine gas detector and place it near any area suspected of Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
leaking.
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Il`
The minimum required free chlorine residual anywhere in the distribution system is -
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Il`
CORRECT ANSWER-a detectable level
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Il` Il` Il`
First draw samples for the analysis of lead and copper water must be collected from
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
taps where the water has stood motionless in the plumbing for at least - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
ANSWER-6 hours
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Samples collected for cloakrooms are collected in plastic bottles that must contain - Il` Il` Il` Il` Il`
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CORRECT ANSWER-Sodium thiosulfate
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The volume of a sample for coliform compliance is - CORRECT ANSWER-100 ml
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If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be
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analyzed within - CORRECT ANSWER-15 minutes
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The heart of a pump is called the - CORRECT ANSWER-impeller
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Which device serves the same function as the packing - CORRECT ANSWER-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Mechanical seal
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Which is used to stop air leakage into the casing around the pump shaft - CORRECT
Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
ANSWER-seals
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Which is at the top of a stuffing box? - CORRECT ANSWER-Packing gland
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Which assembly holds the lantern ring and packing? - CORRECT ANSWER-Stuffing
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box
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Why is it important to monitor the speed of a variable speed pump? - CORRECT
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, Il`
ANSWER-To prevent cavitation from occurring
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Which basic electrical unit is used to measure a materials opposition of flow of
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Il`
electricity? - CORRECT ANSWER-Ohm
Il`
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The first oil change on a pump should be done - CORRECT ANSWER-After a month of
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Il`
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operation
Il`
How often should the temperature of centrifugal pump motor bearings be checked with
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Il`
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a thermometer? - CORRECT ANSWER-Once a month
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All sensors that respond to liquid pressure will preform poorly if _______ enters the air
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sensor - CORRECT ANSWER-Air
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Which agency sets limits on the concentration levels of harmful contaminants in potable
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Il`
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water distributed to costumers? - CORRECT ANSWER-United States Environmental
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Protection Agency
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Which violations are most serious? - CORRECT ANSWER-Tier 1
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A positive fecal coliform test must be reported to the primacy agency within 24 hours -
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Il`
CORRECT ANSWER-24 hours
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The number of monthly distribution system bacteriological samples is required is -
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CORRECT ANSWER-based on the population served
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Which is the approximate angle of response for average soils when using the sloping
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Il`
method for the prevention of cave ins? - CORRECT ANSWER-1.0 : 1.0
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At what time of day is the age of the water stored in a distribution system the lowest? -
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Il`
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CORRECT ANSWER-Late Evening
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Which type of maps should not overlap each other? - CORRECT ANSWER-Sectional
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maps
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Which of the following is a joint for ductile iron piping? - CORRECT ANSWER-Flexible
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ball joint
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The amount of feet in energy required to overcome resistance to flow in a pipe is called
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- CORRECT ANSWER-friction head
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The fire insurance underwriters recommend that no main should have a diameter less
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than - CORRECT ANSWER-6 inches
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Water velocities in a pipe should be limited to 5 ft/sec in order to - CORRECT
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Il`
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ANSWER-minimize friction loss
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Which of the following is a type of joint in polyvinyl chloride piping? - CORRECT
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ANSWER-Bell and spigot type
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Which of the following is a type of joint in polyethylene piping? - CORRECT ANSWER-
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Thermal butt-fusion
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Which of the following is a type of joint for ductile iron piping? - CORRECT ANSWER-
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Flanged joint
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The height of the water in three differently shaped tanks is 22.4 feet. In which tank is the
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questions and answers 100% verified
Il`
Head is measured in - CORRECT ANSWER-feet
Il`
Il` Il` Il` Il` Il` Il` Il`
A plat is - CORRECT ANSWER-A map
Il`
Il` Il` Il` Il` Il` Il` Il`
Which type of valve will prevent the collapse of a pipe - CORRECT ANSWER-Air-and-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
vaccume relief valve
Il`
Il` Il`
The highest degree of protection of a coated steel pipe is - CORRECT ANSWER-
Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
cathodic protection
Il`
Il`
At which time of day is the age of the water stored in the distribution system the
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
highest? - CORRECT ANSWER-In the morning
Il`
Il` Il` Il` Il` Il`
One of chlorines advantages is that it - CORRECT ANSWER-has a persistent residual
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Chlorine gas is _____ times heavier than air. - CORRECT ANSWER-2.5
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
After a water storage tank has been chlorinated, which bacteriological test must prove
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
negative before the tank is put back into service. - CORRECT ANSWER-Coliform test
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Which is the best and most reliable way of finding a very small chlorine leak? -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
CORRECT ANSWER-Use a chlorine gas detector and place it near any area suspected of Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
leaking.
Il`
Il`
Il`
The minimum required free chlorine residual anywhere in the distribution system is -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
CORRECT ANSWER-a detectable level
Il`
Il` Il` Il`
First draw samples for the analysis of lead and copper water must be collected from
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
taps where the water has stood motionless in the plumbing for at least - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
ANSWER-6 hours
Il`
Il`
Samples collected for cloakrooms are collected in plastic bottles that must contain - Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il`
CORRECT ANSWER-Sodium thiosulfate
Il`
Il` Il`
The volume of a sample for coliform compliance is - CORRECT ANSWER-100 ml
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be
Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il`
analyzed within - CORRECT ANSWER-15 minutes
Il`
Il` Il` Il` Il` Il`
The heart of a pump is called the - CORRECT ANSWER-impeller
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Which device serves the same function as the packing - CORRECT ANSWER-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Mechanical seal
Il`
Il`
Which is used to stop air leakage into the casing around the pump shaft - CORRECT
Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
ANSWER-seals
Il`
Which is at the top of a stuffing box? - CORRECT ANSWER-Packing gland
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Which assembly holds the lantern ring and packing? - CORRECT ANSWER-Stuffing
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
box
Il`
Why is it important to monitor the speed of a variable speed pump? - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
, Il`
ANSWER-To prevent cavitation from occurring
Il`
Il` Il` Il` Il`
Which basic electrical unit is used to measure a materials opposition of flow of
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
electricity? - CORRECT ANSWER-Ohm
Il`
Il` Il` Il`
The first oil change on a pump should be done - CORRECT ANSWER-After a month of
Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
operation
Il`
How often should the temperature of centrifugal pump motor bearings be checked with
Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il`
a thermometer? - CORRECT ANSWER-Once a month
Il`
Il` Il` Il` Il` Il` Il`
All sensors that respond to liquid pressure will preform poorly if _______ enters the air
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il`
sensor - CORRECT ANSWER-Air
Il`
Il` Il` Il`
Which agency sets limits on the concentration levels of harmful contaminants in potable
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il`
water distributed to costumers? - CORRECT ANSWER-United States Environmental
Il` Il`
Il`
Il` Il` Il` Il` Il` Il`
Protection Agency
Il`
Il`
Which violations are most serious? - CORRECT ANSWER-Tier 1
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il`
A positive fecal coliform test must be reported to the primacy agency within 24 hours -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
CORRECT ANSWER-24 hours
Il`
Il` Il`
The number of monthly distribution system bacteriological samples is required is -
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il`
CORRECT ANSWER-based on the population served
Il`
Il` Il` Il` Il` Il`
Which is the approximate angle of response for average soils when using the sloping
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
method for the prevention of cave ins? - CORRECT ANSWER-1.0 : 1.0
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
At what time of day is the age of the water stored in a distribution system the lowest? -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il`
CORRECT ANSWER-Late Evening
Il`
Il` Il`
Which type of maps should not overlap each other? - CORRECT ANSWER-Sectional
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
maps
Il`
Which of the following is a joint for ductile iron piping? - CORRECT ANSWER-Flexible
Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
ball joint
Il`
Il`
The amount of feet in energy required to overcome resistance to flow in a pipe is called
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
- CORRECT ANSWER-friction head
Il`
Il` Il` Il`
The fire insurance underwriters recommend that no main should have a diameter less
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
than - CORRECT ANSWER-6 inches
Il`
Il` Il` Il` Il`
Water velocities in a pipe should be limited to 5 ft/sec in order to - CORRECT
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
ANSWER-minimize friction loss
Il`
Il` Il`
Which of the following is a type of joint in polyvinyl chloride piping? - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
ANSWER-Bell and spigot type
Il`
Il` Il` Il`
Which of the following is a type of joint in polyethylene piping? - CORRECT ANSWER-
Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Thermal butt-fusion
Il`
Il`
Which of the following is a type of joint for ductile iron piping? - CORRECT ANSWER-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Flanged joint
Il`
Il`
The height of the water in three differently shaped tanks is 22.4 feet. In which tank is the
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
