WATER DISTRIBUTION level 1 review
questions and answers
What the primary objective of water distribution operators - CORRECT ANSWER-
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deliver safe and pleasant drinking water to the consumers
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what should the distribution operator do if there is a complaint about the water? -
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CORRECT ANSWER-record the info and have the problem investigated and notify the
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person complained and what corrective was taken.
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Most accidents result from - CORRECT ANSWER-carelessness and negligence
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why are adequate and reliable records very important? - CORRECT ANSWER-to
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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document the effectiveness of your operation
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an greater obligation rest with whom, and why? - CORRECT ANSWER-operators
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because of the great number who drink the water from the distribution system
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purpose of the a water storage facility? - CORRECT ANSWER-provide a sufficient amount
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
of water to average or peak demand.,needs for fire protection, industrial uses and reserve
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storage
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where are storage tanks are found in the distribution - CORRECT ANSWER-closest to
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the users, where higher pressure are needed and where land is available.
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what signifies and standpipes? - CORRECT ANSWER-the height is greater than their
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diameter
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where are standing pipes are located? - CORRECT ANSWER-high ground and near
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well field or point in the distribution system
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why are stand pipes preferred over elevated storage? - CORRECT ANSWER-easy to
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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maintain, more accessible safer and less objectionable from aesthetic viewpoint
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Hydropneumatic or pressure tank are used mostly in what type of plant? - CORRECT Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
ANSWER-small system wells, they are pressure vessels caution with the pressures relief
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
valve.
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hydropneumatic or pressure tank should have what amount of air to operate sufficient. - Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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CORRECT ANSWER-2/3 or 1/3 air, otherwise cause the starting and stopping of the Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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pumps causing damage.
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why should pressure tanks have a sight glass? - CORRECT ANSWER-to observe water
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to air ratio
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what is an disadvantage of pressure tanks? - CORRECT ANSWER-not enough storage
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to meet demand in cause of power outage, and little time to do maintenance
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what are surge tanks? - CORRECT ANSWER-protect water line due too excessive
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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surge pressure, also use to control water hammer and regulate the flow of water
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where should surge tanks be located? - CORRECT ANSWER-close as possible to
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activity that create water hammering.
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, name procedure for storage operating a storage tank. - CORRECT ANSWER-fill all tanks
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during off peak hours, maintaining specified psi at critical points in distribution.
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Disadvantage of Variable speed pumps? - CORRECT ANSWER-Costly to operate.
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what normal operation procedure that can reduce cost? - CORRECT ANSWER-time-of
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day concept, pumps are only used during the off peak hours of electrical usage. 10pm-
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6am
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what can eliminate taste and odor problems in a storage tank. - CORRECT ANSWER-
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periodally allow it to empty and be refilled.
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the purpose of altitude-control valve? - CORRECT ANSWER-prevent overflow from the
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
storage tank, maintain a constant water level as long as water pressure in distribution is
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adequate.
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what is the simplest way to control level in storage? - CORRECT ANSWER-electrodes,
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but most problem arise when they are hard to reach and they get corroded.
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what is ultrasonic signals in storage tanks? - CORRECT ANSWER-transmitter sends a
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
continues high-frequency to a receiver and when the water cover it the signal is broken.
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what are pressure switch in storage tanks? - CORRECT ANSWER-response to
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
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changes in pressure in the tank to control pumps
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what is the main problem with radio frequencies? - CORRECT ANSWER-bad weather
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and lighting cause voltage interferes or disrupts
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Name item needed to operate a centrifugal pump. - CORRECT ANSWER-impeller
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submerged in water, never operate until prime.
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what is JTU's - CORRECT ANSWER-Jackson turbidimeter is a Visual method
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3 type of maintenance ? - CORRECT ANSWER-preventive, predictive, and corrective
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what's corrective maintenance? - CORRECT ANSWER-a problem already exist to be
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repaired
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how long should the outside or inside of painted pipes or tanks last? - CORRECT
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ANSWER-outside should last 5 yrs and 3-5 yrs. inside a tank.
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when is the best time to take out of service a storage tank in most cases? - CORRECT
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ANSWER-october - April
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two type of paints for refurnishing storage tanks. - CORRECT ANSWER-short life
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coating-protection for 6 yrs., long life-10yrs.
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before entering a tank what oxygen is safe? - CORRECT ANSWER-19.5-23.5 oxygen
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name some items that increase corrosion - CORRECT ANSWER-dissolve oxygen,
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carbon dioxide, dissolved minerals, salts.
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Electrical control of corrosion is - CORRECT ANSWER-Cathodic protection
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what is known as a corrosion inhibitor? - CORRECT ANSWER-any substance that
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promotes film formation on the surface to be protected, example: lime, soda ash, and
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caustic soda
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when pH is above equilibrium what coating is form? - CORRECT ANSWER-calcium
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questions and answers
What the primary objective of water distribution operators - CORRECT ANSWER-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
deliver safe and pleasant drinking water to the consumers
Il`
Il` Il` Il` Il` Il` Il` Il` Il`
what should the distribution operator do if there is a complaint about the water? -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
CORRECT ANSWER-record the info and have the problem investigated and notify the
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
person complained and what corrective was taken.
Il`
Il`
Il` Il` Il` Il` Il` Il` Il`
Most accidents result from - CORRECT ANSWER-carelessness and negligence
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il`
why are adequate and reliable records very important? - CORRECT ANSWER-to
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
document the effectiveness of your operation
Il`
Il` Il` Il` Il` Il`
an greater obligation rest with whom, and why? - CORRECT ANSWER-operators
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il`
because of the great number who drink the water from the distribution system
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
purpose of the a water storage facility? - CORRECT ANSWER-provide a sufficient amount
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
of water to average or peak demand.,needs for fire protection, industrial uses and reserve
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
storage
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where are storage tanks are found in the distribution - CORRECT ANSWER-closest to
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
the users, where higher pressure are needed and where land is available.
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
what signifies and standpipes? - CORRECT ANSWER-the height is greater than their
Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
diameter
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where are standing pipes are located? - CORRECT ANSWER-high ground and near
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
well field or point in the distribution system
Il`
Il` Il` Il` Il` Il` Il` Il`
why are stand pipes preferred over elevated storage? - CORRECT ANSWER-easy to
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il` Il`
maintain, more accessible safer and less objectionable from aesthetic viewpoint
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il`
Hydropneumatic or pressure tank are used mostly in what type of plant? - CORRECT Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
ANSWER-small system wells, they are pressure vessels caution with the pressures relief
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
valve.
Il`
Il`
Il`
hydropneumatic or pressure tank should have what amount of air to operate sufficient. - Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
CORRECT ANSWER-2/3 or 1/3 air, otherwise cause the starting and stopping of the Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
pumps causing damage.
Il`
Il` Il`
why should pressure tanks have a sight glass? - CORRECT ANSWER-to observe water
Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
to air ratio
Il`
Il` Il`
what is an disadvantage of pressure tanks? - CORRECT ANSWER-not enough storage
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
to meet demand in cause of power outage, and little time to do maintenance
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
what are surge tanks? - CORRECT ANSWER-protect water line due too excessive
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il`
surge pressure, also use to control water hammer and regulate the flow of water
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
where should surge tanks be located? - CORRECT ANSWER-close as possible to
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il`
activity that create water hammering.
Il`
Il` Il` Il` Il`
, name procedure for storage operating a storage tank. - CORRECT ANSWER-fill all tanks
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
during off peak hours, maintaining specified psi at critical points in distribution.
Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Disadvantage of Variable speed pumps? - CORRECT ANSWER-Costly to operate.
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
what normal operation procedure that can reduce cost? - CORRECT ANSWER-time-of
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
day concept, pumps are only used during the off peak hours of electrical usage. 10pm-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
6am
Il`
what can eliminate taste and odor problems in a storage tank. - CORRECT ANSWER-
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il`
periodally allow it to empty and be refilled.
Il`
Il` Il` Il` Il` Il` Il` Il`
the purpose of altitude-control valve? - CORRECT ANSWER-prevent overflow from the
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
storage tank, maintain a constant water level as long as water pressure in distribution is
Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
adequate.
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what is the simplest way to control level in storage? - CORRECT ANSWER-electrodes,
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
but most problem arise when they are hard to reach and they get corroded.
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
what is ultrasonic signals in storage tanks? - CORRECT ANSWER-transmitter sends a
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
continues high-frequency to a receiver and when the water cover it the signal is broken.
Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
what are pressure switch in storage tanks? - CORRECT ANSWER-response to
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
changes in pressure in the tank to control pumps
Il`
Il` Il` Il` Il` Il` Il` Il` Il`
what is the main problem with radio frequencies? - CORRECT ANSWER-bad weather
Il` Il` Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il`
and lighting cause voltage interferes or disrupts
Il`
Il` Il` Il` Il` Il` Il`
Name item needed to operate a centrifugal pump. - CORRECT ANSWER-impeller
Il` Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il`
submerged in water, never operate until prime.
Il`
Il` Il` Il` Il` Il` Il`
what is JTU's - CORRECT ANSWER-Jackson turbidimeter is a Visual method
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
3 type of maintenance ? - CORRECT ANSWER-preventive, predictive, and corrective
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
what's corrective maintenance? - CORRECT ANSWER-a problem already exist to be
Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
repaired
Il`
how long should the outside or inside of painted pipes or tanks last? - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
ANSWER-outside should last 5 yrs and 3-5 yrs. inside a tank.
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
when is the best time to take out of service a storage tank in most cases? - CORRECT
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
ANSWER-october - April
Il`
Il` Il`
two type of paints for refurnishing storage tanks. - CORRECT ANSWER-short life
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
Il`
coating-protection for 6 yrs., long life-10yrs.
Il`
Il` Il` Il` Il` Il`
before entering a tank what oxygen is safe? - CORRECT ANSWER-19.5-23.5 oxygen
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
name some items that increase corrosion - CORRECT ANSWER-dissolve oxygen,
Il` Il` Il` Il` Il` Il`
Il`
Il` Il` Il` Il`
carbon dioxide, dissolved minerals, salts.
Il`
Il` Il` Il` Il`
Electrical control of corrosion is - CORRECT ANSWER-Cathodic protection
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il`
what is known as a corrosion inhibitor? - CORRECT ANSWER-any substance that
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
promotes film formation on the surface to be protected, example: lime, soda ash, and
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`
caustic soda
Il`
Il`
Il` Il`
when pH is above equilibrium what coating is form? - CORRECT ANSWER-calcium
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