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2024 "C" WATER OPERATOR - 600 STUDY EXAM QUESTIONS WITH CORRECT ANSWERS
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2024 "C" WATER OPERATOR - 600 STUDY EXAM QUESTIONS WITH CORRECT ANSWERS
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2024 "C" WATER OPERATOR - 600STUDY EXAM QUESTIONS WITH
CORRECT ANSWERS
What is an Ampere? - CORRECT-ANSWERSa unit of measurement for current
Which of the following is a type of pump that is commonly used in a water
treatment plant? - CORRECT-ANSWERSCentrifugal
a solution is acidic if there is more _____ than _______ - CORRECT-
ANSWERShydrogen ions / hydroxide ions
the WTP with a hydro-pneumatic tank is receiving calls concerning air
bubbles in the water lines. what action needs to be taken? - CORRECT-
ANSWERScheck storage tank for air pressure, water level, and compressor
running time
what is the probable cause for air in the water lines of a system that uses a
hydro-pneumatic tank? - CORRECT-ANSWERScompressor running
continuously / air relief valve stuck
what is the best corrective action for a hydro-pneumatic tank that is putting
air into the water lines? - CORRECT-ANSWERSshut off compressor, drain
receiver, remove excess air
coagulants generally used in the water treatment process release? -
CORRECT-ANSWERSions having more than one positive charge
WTP operators are primarily concerned with particles in water that carry a
___? - CORRECT-ANSWERSnegative electrical charge
_______ tends to increase corrosion - CORRECT-ANSWERSlow flow
the optimum Ph range for ferric sulfate usage is? - CORRECT-ANSWERS4.0 to
6.2
properly coagulated water shows? - CORRECT-ANSWERSclear water between
particles
,a positive mineral ion found in high concentration in deep well water that can
cause hard boiler scaling is? - CORRECT-ANSWERSsilica
water with a TDS concentration of 1500 mg/l may be classified - CORRECT-
ANSWERS
how far apart should fire hydrants be in residential areas? - CORRECT-
ANSWERS500'
dry fire hydrants have their operating valve where? - CORRECT-ANSWERSat
the bottom
fire hydrants in commercial zoned areas should bot be more than? -
CORRECT-ANSWERS300' from any point of commercial building
main line valves should be _______ apart. - CORRECT-ANSWERS800 to 1000
feet
water plant records must be kept on site for _____ years - CORRECT-
ANSWERS10
WTP MORs must be kept on sire for _____ years - CORRECT-ANSWERS10
the ratio of permeate to feed flow in TO treatment is known as "_____
percentage" - CORRECT-ANSWERSrecovery
which of the following is an indication that the backwash rates are too low? -
CORRECT-ANSWERShigh initial headloss?
all chlorinators used for metering gaseous chlorine operate basically as? -
CORRECT-ANSWERSpressure reducing devices
the physical and chemical change that occurs between a coagulant and
alkaline compounds in water to form an incipient floc is called? - CORRECT-
ANSWERScoagulation
the positive electrode where corrosion takes place is called? - CORRECT-
ANSWERSanode
hydro-chlorites tend to? - CORRECT-ANSWERSincrease Ph
a glass tube partially filled with liquid that measures gas pressure is called? -
CORRECT-ANSWERSmanometer
the maximum Cl2 concentration that a person may be safely exposed to for
one hour is? - CORRECT-ANSWERS4 ppm
,the available chlorine in HTH is the? - CORRECT-ANSWERSpounds of
available chlorine in the container
what does HTH stand for? - CORRECT-ANSWERShigh test hypochlorite
wards and certain employees of the state may be exempted from ? -
CORRECT-ANSWERSexamination fees
flow recorders in water treatment plants record: - CORRECT-ANSWERSrate of
flow at a given time
a sample collected for Ph measurement should be? - CORRECT-
ANSWERSmeasured for temperature
what is the advantage of using a DO probe and meter? - CORRECT-
ANSWERSallows measurement to be taken directly in stream
besides a DO meter, what other method can you use to measure DO? -
CORRECT-ANSWERSWinkler-Azide method
trouble shooting is a technique for? - CORRECT-ANSWERSidentifying
problems, causes, and solutions
oxygen transfer rate is dependent on? - CORRECT-ANSWERStotal area of
water exposed to air
sludge collection devices should move? - CORRECT-ANSWERSslowly
What is a multi-staged pump? - CORRECT-ANSWERShas more than one
impeller
if the pump impeller is running backwards, what action must be taken to
correct the rotation? - CORRECT-ANSWERSswitch any two electrical leads
When should the packing of a pump be adjusted? - CORRECT-ANSWERSwhen
the pump is running
when a pump fails to deliver at its rated capacity, what is most likely the
cause? - CORRECT-ANSWERSair leak
what is a common cause for vibrations in a motor? - CORRECT-
ANSWERSmisalignment of the couplings
, What is the purpose of the wear rings in a pump? - CORRECT-ANSWERSPlug
internal leakage
what should the seal water pressure be for a pump? - CORRECT-ANSWERS5
psi higher than the pumps discharge pressure
what is the purpose of the seal water? - CORRECT-ANSWERSblock out air
intake and lubricate the packing
what is the recommended maximum suction lift? - CORRECT-ANSWERS15 ft.
In a water treatment plant, what type of pump is commonly used to deliver
chemical solutions? - CORRECT-ANSWERSPositive displacement
when should you lubricate your equipment? - CORRECT-ANSWERSfollow the
manufacturer's recommendations
In what manner is packing installed? - CORRECT-ANSWERSa strip at a time
and staggered
a positive displacement pump should never be operated________? -
CORRECT-ANSWERSagainst a closed discharge valve
if two of more pumps of the same size and purpose are online, what method
of operation is recommended for them? - CORRECT-ANSWERSalternate to
equalize wear
If half of the mechanical seal fails, what corrective action should be taken? -
CORRECT-ANSWERSchange both halves of the seal
what is the purpose of a lantern ring? - CORRECT-ANSWERSwater seal
The packing of a pump should be adjusted to _________? - CORRECT-
ANSWERSallow a slight operating leakage and allow approximately a drip per
second.
On a multiple drive motor, when a belt fails, what corrective action should be
taken? - CORRECT-ANSWERSReplace all the belts on the drive
To keep a centrifugal pump primed, install a _______ valve at the end of the
suction line. - CORRECT-ANSWERSfoot valve
If a motor fails to start, what should be checked first? - CORRECT-
ANSWERSPower supply
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