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Water Distribution 1 Questions and Answers Fully Solved
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Water Distribution 1
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Water Distribution 1Head is measured in - answer feet
A plat is - answer A map
Which type of valve will prevent the collapse of a pipe - answer Air-and-vacuumed 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? - answer In the morning
One of chlorines advantages is that it - answer has a persistent residual
Chlorine gas is _____ times heavier than air. - answer2.5
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
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 - answer6 hours
Samples collected for cloakrooms are collected in plastic bottles that must contain -
answer Sodium thiosulfate
The volume of a sample for coliform compliance is - answer100 ml
If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be
analyzed within - answer15 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
Which assembly holds the lantern ring and packing? - answer Stuffing box
Why is it important to monitor the speed of a variable speed pump? - answer To prevent
cavitation from occurring
Which basic electrical unit is used to measure a materials opposition of flow of
electricity? - answer Ohm
The first oil change on a pump should be done - answer After a month of operation
How often should the temperature of centrifugal pump motor bearings be checked with
a thermometer? - answer Once a month
All sensors that respond to liquid pressure will preform poorly if _______ enters the air
sensor - answer Air
Which agency sets limits on the concentration levels of harmful contaminants in potable
water distributed to costumers? - answer United States Environmental Protection
Agency
Which violations are most serious? - answer Tier 1
A positive fecal coliform test must be reported to the primacy agency within 24 hours -
answer24 hours
The number of monthly distribution system bacteriological samples is required is -
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? - answer1.0 : 1.0
At what time of day is the age of the water stored in a distribution system the lowest? -
answer Late Evening
Which type of maps should not overlap each other? - answer Sectional maps
Which of the following is a joint for ductile iron piping? - answer Flexible ball joint
The amount of feet in energy required to overcome resistance to flow in a pipe is called
- answer friction head
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