Fluoride is generally added to public water supplies to
Protect he dental health of young citizens
An operator uses BLANK to test for fluoride
SPADNS
Overexposure to fluoride can lead to what condition
Fluorosis
The primary contaminant limit for fluoride is
4.0 mg/L
The secondary contaminant limit for fluoride is
2.0 mg/L
When calculating the fluoride feed rate, the operator must consider the purity of the chemical and the
Available Fluoride Ion 9AFI
The flow of electrical current is measured in
Amperes
An operator hears a pinging sound coming form the pump. What is the probable cause
Cavitation
During routine inspection on a centrifugal pump, the operator notices that the bearings are excessively hot. This is most likely caused by
Over lubrication
The leakage of seal water around the packing on a centrifugal pump is required because it acts as a(n)
Coolant
The letter or units GPM appearing on a flow rate indicator in a pumping station means
Gallons per Minute
The component of a centrifugal pump sometimes installed on the end of the suction pipe in order to hold prime is the
Foot valve
A pump in continuous service should be inspected for cleanliness and leakage at least
Daily
The main purpose of pump priming is to
Replace air with water inside the pump
Which kind of pumps uses a volute wrapped around a spinning impeller
Centrifugal
Fuses blow due to high
Amperage demand
One gallon per minute equals BLANK gallons per day
1,140
A single sample taken without considering the time of day or the rate of flow is called a(n) BLANK sample
Grab
Total coliform samples are considered to be
Flushed
When taking a routine Bac-T sample, the sampler should also check
Chlorine
A household faucet must remain unused for BLANK hours before a first draw sample is collected for analyses of lead and copper
6
Lead and copper are both based on
90th percentile action levels