Water Distribution 1 Final exam
questions and answers 100% verified
Head is measured in - CORRECT ANSWER-feet
A plat is - CORRECT ANSWER-A map
Which type of valve will prevent the collapse of a pipe - CORRECT ANSWER-Air-and-
vaccume relief valve
The highest degree of protection of a coated steel pipe is - CORRECT ANSWER-
cathodic protection
At which time of day is the age of the water stored in the distribution system the
highest? - CORRECT ANSWER-In the morning
One of chlorines advantages is that it - CORRECT ANSWER-has a persistent residual
Chlorine gas is _____ times heavier than air. - CORRECT ANSWER-2.5
After a water storage tank has been chlorinated, which bacteriological test must prove
negative before the tank is put back into service. - CORRECT ANSWER-Coliform test
Which is the best and most reliable way of finding a very small chlorine leak? -
CORRECT 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 -
CORRECT ANSWER-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 - CORRECT
ANSWER-6 hours
Samples collected for cloakrooms are collected in plastic bottles that must contain -
CORRECT ANSWER-Sodium thiosulfate
The volume of a sample for coliform compliance is - CORRECT ANSWER-100 ml
If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be
analyzed within - CORRECT ANSWER-15 minutes
The heart of a pump is called the - CORRECT ANSWER-impeller
, Which device serves the same function as the packing - CORRECT ANSWER-
Mechanical seal
Which is used to stop air leakage into the casing around the pump shaft - CORRECT
ANSWER-seals
Which is at the top of a stuffing box? - CORRECT ANSWER-Packing gland
Which assembly holds the lantern ring and packing? - CORRECT ANSWER-Stuffing
box
Why is it important to monitor the speed of a variable speed pump? - CORRECT
ANSWER-To prevent cavitation from occurring
Which basic electrical unit is used to measure a materials opposition of flow of
electricity? - CORRECT ANSWER-Ohm
The first oil change on a pump should be done - CORRECT ANSWER-After a month of
operation
How often should the temperature of centrifugal pump motor bearings be checked with
a thermometer? - CORRECT ANSWER-Once a month
All sensors that respond to liquid pressure will preform poorly if _______ enters the air
sensor - CORRECT ANSWER-Air
Which agency sets limits on the concentration levels of harmful contaminants in potable
water distributed to costumers? - CORRECT ANSWER-United States Environmental
Protection Agency
Which violations are most serious? - CORRECT ANSWER-Tier 1
A positive fecal coliform test must be reported to the primacy agency within 24 hours -
CORRECT ANSWER-24 hours
The number of monthly distribution system bacteriological samples is required is -
CORRECT ANSWER-based on the population served
Which is the approximate angle of response for average soils when using the sloping
method for the prevention of cave ins? - CORRECT ANSWER-1.0 : 1.0
At what time of day is the age of the water stored in a distribution system the lowest? -
CORRECT ANSWER-Late Evening
questions and answers 100% verified
Head is measured in - CORRECT ANSWER-feet
A plat is - CORRECT ANSWER-A map
Which type of valve will prevent the collapse of a pipe - CORRECT ANSWER-Air-and-
vaccume relief valve
The highest degree of protection of a coated steel pipe is - CORRECT ANSWER-
cathodic protection
At which time of day is the age of the water stored in the distribution system the
highest? - CORRECT ANSWER-In the morning
One of chlorines advantages is that it - CORRECT ANSWER-has a persistent residual
Chlorine gas is _____ times heavier than air. - CORRECT ANSWER-2.5
After a water storage tank has been chlorinated, which bacteriological test must prove
negative before the tank is put back into service. - CORRECT ANSWER-Coliform test
Which is the best and most reliable way of finding a very small chlorine leak? -
CORRECT 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 -
CORRECT ANSWER-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 - CORRECT
ANSWER-6 hours
Samples collected for cloakrooms are collected in plastic bottles that must contain -
CORRECT ANSWER-Sodium thiosulfate
The volume of a sample for coliform compliance is - CORRECT ANSWER-100 ml
If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be
analyzed within - CORRECT ANSWER-15 minutes
The heart of a pump is called the - CORRECT ANSWER-impeller
, Which device serves the same function as the packing - CORRECT ANSWER-
Mechanical seal
Which is used to stop air leakage into the casing around the pump shaft - CORRECT
ANSWER-seals
Which is at the top of a stuffing box? - CORRECT ANSWER-Packing gland
Which assembly holds the lantern ring and packing? - CORRECT ANSWER-Stuffing
box
Why is it important to monitor the speed of a variable speed pump? - CORRECT
ANSWER-To prevent cavitation from occurring
Which basic electrical unit is used to measure a materials opposition of flow of
electricity? - CORRECT ANSWER-Ohm
The first oil change on a pump should be done - CORRECT ANSWER-After a month of
operation
How often should the temperature of centrifugal pump motor bearings be checked with
a thermometer? - CORRECT ANSWER-Once a month
All sensors that respond to liquid pressure will preform poorly if _______ enters the air
sensor - CORRECT ANSWER-Air
Which agency sets limits on the concentration levels of harmful contaminants in potable
water distributed to costumers? - CORRECT ANSWER-United States Environmental
Protection Agency
Which violations are most serious? - CORRECT ANSWER-Tier 1
A positive fecal coliform test must be reported to the primacy agency within 24 hours -
CORRECT ANSWER-24 hours
The number of monthly distribution system bacteriological samples is required is -
CORRECT ANSWER-based on the population served
Which is the approximate angle of response for average soils when using the sloping
method for the prevention of cave ins? - CORRECT ANSWER-1.0 : 1.0
At what time of day is the age of the water stored in a distribution system the lowest? -
CORRECT ANSWER-Late Evening
