Water Distribution Grade 1 Exam
Questions and Answers 100% Correct
Drawdown - ANSWER-The difference between the static groundwater and the
pumping level. Pumping - static = drawdown
A customer complaint about the presence of brown floc in tap water can best be
handled by...? - ANSWER-investigating the problem ASAP.
The term "aquifer" refers to what type of water? - ANSWER-Groundwater
One indication of corrosive water is a high concentration of...? - ANSWER-Carbon
dioxide. CO2 in water creates carbonic acid, which drives down the pH, making the
water acidic.
Cathodic protection means protection against what? - ANSWER-Corrosion.
The primary reason for the use of a dry barrel fire hydrant is to...? - ANSWER-keep
the hydrant from freezing.
At the same barometric pressure, the amount of dissolved oxygen in cold water
tends to be ______ the amount of dissolved oxygen in warm water. - ANSWER-More
than. Denser water molecules hold onto oxygen more than the less dense do.
The principal constituent in water that causes corrosion of metals is...? - ANSWER-
hydrogen sulfide
Which component of a centrifugal pump moves the water? - ANSWER-the impeller
Comprehensive map (AKA Charles Atlas) - ANSWER-A record containing size,
location, and types of water mains, valves, hydrants, tanks, reservoirs, and pump
stations.
Water suitable for drinking - ANSWER-Potable
Velocity of flow in mains is usually expressed in terms of - ANSWER-feet per second
A "competent person" at an excavation work site is capable of... - ANSWER-
identifying hazards and has the authority to take corrective measures.
Hydrogen sulfide gas smells like...? - ANSWER-rotten eggs
Oxidation and filtration can be used for what? - ANSWER-To remove high iron
content from a well supply.
,Hardness may be expressed in...? - ANSWER-milligrams per liter as CaCO3
The basic unit of electrical power is the...? - ANSWER-Watt. Watt = volt x amp
Check valves are used to...? - ANSWER-permit flow in only one direction
Standard pumper - connection fire hydrants should not be installed on water mains
smaller than _________ inches in diameter - ANSWER-6
Beards or long sideburns prohibit an operator from safely...? - ANSWER-wearing the
face mask of a self-contained breathing apparatus.
The water table is defined as the...? - ANSWER-upper surface of groundwater
The shaft speed of an electric motor is most commonly expressed in units of what? -
ANSWER-revolutions per minute
A coupon test installation in a distribution system is used to...? - ANSWER-determine
the rate of scaling or corrosion. You want to be on the slight scaling side. You do not
want to be on the corrosion side.
Pathogenic - ANSWER-disease-causing bacteria.
Normally, surface water and groundwater have a pH range of...? - ANSWER-6.8-8.5
Turbidity in water - ANSWER-anything in water that scatters light.
How often should a "competent person" inspect excavations and adjacent areas for
hazards? - ANSWER-Daily, prior to the start of work, and as needed throughout the
shift.
Foot valve - ANSWER-The component of a centrifugal pump that is sometimes
installed on the end of the suction pipe to hold the priming.
The principal purpose to an altitude valve on an elevated tank is to...? - ANSWER-
control maximum filling level in distribution storage.
Primacy - ANSWER-Primary authority for implementation and enforcement of
drinking water regulations.
Moderately Hard Water Will Have a Hardness Range of _____ mg/liter as calcium
carbonate - ANSWER-61-120
Aeration - ANSWER-A common method for removing hydrogen sulfide.
Disinfection - ANSWER-The treatment process designed to kill pathogenic
organisms. Selective destruction or inactivation of pathogenic organisms.
Lead in drinking water can result in...? - ANSWER-impaired mental functioning in
children
, A disease that might be transferred to a victim through water. - ANSWER-Typhoid
An average percentage range for unaccounted for water in a fully metered system is
- ANSWER-11-15%
A cross-connection is defined as a connection between... - ANSWER-a potable
water system and a non-potable water system.
Backsiphonage is caused by - ANSWER-partial vacuum in the line
Five milligrams per liter equals ___ parts per million. - ANSWER-5
When the pumping rate is increased in a well, the effect is to... - ANSWER-lower the
pumping level
The chemical most often used to disinfect a public water supply - ANSWER-Chlorine
or chlorine compounds (chloramine)
The purpose of a surge tank is to... - ANSWER-control water hammer
The presence of total coliforms in drinking water indicates... - ANSWER-potential
presence of pathogens
MCL - ANSWER-Maximum Contaminant Level
The primary origin of coliforms in water supplies is - ANSWER-fecal contamination
by warm-blooded animals
The primary source of trihalomethanes (THMs) in drinking water is - ANSWER-the
reaction of chlorine compounds and organic matter.
An air-gap device is used to - ANSWER-prevent backflow of nonpotable water into a
drinking water supply
The primary health risk associated with THMs is - ANSWER-cancer
The purpose of the fusible plug on a chlorine tank is to - ANSWER-prevent the
cylinder from exploding at high temperatures.
The primary health risk associated with synthetic organic compounds (SOCs) is -
ANSWER-cancer
Potable water lines should never be connected to...? - ANSWER-a contaminated
water source
The primary sources of SOC contamination in water supplies are...? - ANSWER-
industrial solvents and agricultural pesticides
Questions and Answers 100% Correct
Drawdown - ANSWER-The difference between the static groundwater and the
pumping level. Pumping - static = drawdown
A customer complaint about the presence of brown floc in tap water can best be
handled by...? - ANSWER-investigating the problem ASAP.
The term "aquifer" refers to what type of water? - ANSWER-Groundwater
One indication of corrosive water is a high concentration of...? - ANSWER-Carbon
dioxide. CO2 in water creates carbonic acid, which drives down the pH, making the
water acidic.
Cathodic protection means protection against what? - ANSWER-Corrosion.
The primary reason for the use of a dry barrel fire hydrant is to...? - ANSWER-keep
the hydrant from freezing.
At the same barometric pressure, the amount of dissolved oxygen in cold water
tends to be ______ the amount of dissolved oxygen in warm water. - ANSWER-More
than. Denser water molecules hold onto oxygen more than the less dense do.
The principal constituent in water that causes corrosion of metals is...? - ANSWER-
hydrogen sulfide
Which component of a centrifugal pump moves the water? - ANSWER-the impeller
Comprehensive map (AKA Charles Atlas) - ANSWER-A record containing size,
location, and types of water mains, valves, hydrants, tanks, reservoirs, and pump
stations.
Water suitable for drinking - ANSWER-Potable
Velocity of flow in mains is usually expressed in terms of - ANSWER-feet per second
A "competent person" at an excavation work site is capable of... - ANSWER-
identifying hazards and has the authority to take corrective measures.
Hydrogen sulfide gas smells like...? - ANSWER-rotten eggs
Oxidation and filtration can be used for what? - ANSWER-To remove high iron
content from a well supply.
,Hardness may be expressed in...? - ANSWER-milligrams per liter as CaCO3
The basic unit of electrical power is the...? - ANSWER-Watt. Watt = volt x amp
Check valves are used to...? - ANSWER-permit flow in only one direction
Standard pumper - connection fire hydrants should not be installed on water mains
smaller than _________ inches in diameter - ANSWER-6
Beards or long sideburns prohibit an operator from safely...? - ANSWER-wearing the
face mask of a self-contained breathing apparatus.
The water table is defined as the...? - ANSWER-upper surface of groundwater
The shaft speed of an electric motor is most commonly expressed in units of what? -
ANSWER-revolutions per minute
A coupon test installation in a distribution system is used to...? - ANSWER-determine
the rate of scaling or corrosion. You want to be on the slight scaling side. You do not
want to be on the corrosion side.
Pathogenic - ANSWER-disease-causing bacteria.
Normally, surface water and groundwater have a pH range of...? - ANSWER-6.8-8.5
Turbidity in water - ANSWER-anything in water that scatters light.
How often should a "competent person" inspect excavations and adjacent areas for
hazards? - ANSWER-Daily, prior to the start of work, and as needed throughout the
shift.
Foot valve - ANSWER-The component of a centrifugal pump that is sometimes
installed on the end of the suction pipe to hold the priming.
The principal purpose to an altitude valve on an elevated tank is to...? - ANSWER-
control maximum filling level in distribution storage.
Primacy - ANSWER-Primary authority for implementation and enforcement of
drinking water regulations.
Moderately Hard Water Will Have a Hardness Range of _____ mg/liter as calcium
carbonate - ANSWER-61-120
Aeration - ANSWER-A common method for removing hydrogen sulfide.
Disinfection - ANSWER-The treatment process designed to kill pathogenic
organisms. Selective destruction or inactivation of pathogenic organisms.
Lead in drinking water can result in...? - ANSWER-impaired mental functioning in
children
, A disease that might be transferred to a victim through water. - ANSWER-Typhoid
An average percentage range for unaccounted for water in a fully metered system is
- ANSWER-11-15%
A cross-connection is defined as a connection between... - ANSWER-a potable
water system and a non-potable water system.
Backsiphonage is caused by - ANSWER-partial vacuum in the line
Five milligrams per liter equals ___ parts per million. - ANSWER-5
When the pumping rate is increased in a well, the effect is to... - ANSWER-lower the
pumping level
The chemical most often used to disinfect a public water supply - ANSWER-Chlorine
or chlorine compounds (chloramine)
The purpose of a surge tank is to... - ANSWER-control water hammer
The presence of total coliforms in drinking water indicates... - ANSWER-potential
presence of pathogens
MCL - ANSWER-Maximum Contaminant Level
The primary origin of coliforms in water supplies is - ANSWER-fecal contamination
by warm-blooded animals
The primary source of trihalomethanes (THMs) in drinking water is - ANSWER-the
reaction of chlorine compounds and organic matter.
An air-gap device is used to - ANSWER-prevent backflow of nonpotable water into a
drinking water supply
The primary health risk associated with THMs is - ANSWER-cancer
The purpose of the fusible plug on a chlorine tank is to - ANSWER-prevent the
cylinder from exploding at high temperatures.
The primary health risk associated with synthetic organic compounds (SOCs) is -
ANSWER-cancer
Potable water lines should never be connected to...? - ANSWER-a contaminated
water source
The primary sources of SOC contamination in water supplies are...? - ANSWER-
industrial solvents and agricultural pesticides
