Water Distribution | Questions with 100% Verified Answers |
Latest Update 2026/2027
Question: Potable water may be defined as:
a. Any water that occasionally may be polluted from another
source
b. Any water that, according to recognized standards, is safe
for consumption
c. Water high in organic content
d. Water that has been transported from outside the service
area
Answer: b). Any water that according to recognized standard is safe for human consumption.
Question: To prevent the entry of surface contamination into a well is the purpose of:
a. The well casing
b. The louvers or slots
c. Well development
d. The sanitary seal
Answer: d) The Sanitary Seal
Question: Pure water will exhibit a pH value of?
a. 0.0
b. 7.0
c. 10.5
d. 14.0
Answer: b) 7.0
Question: A pH reading of 6.0 units indicates that the water sample is:
a. Very acidic
b. Slightly alkaline
c. Very alkaline
d. Slightly acidic
Answer: d) Slightly Acidic
Question: In drinking water quality, "TDS" is the abbreviation for? a)Total digestable substances
b) Total dissolved solids
c) Time-delayed sicknesses
d) Terminal diseases started
Answer: b) Total Dissolved Solids
Question: In drinking water regulations, the abbreviation "MCL" stands for?
a) Maximum contaminant level
b) Multiple constituent levels
c) Most common level
d) Minimum considered legal
Answer: a) Maximum contaminant level
Question: The MBAS method is used to determine levels of which of the following drinking water constituents?
Answer: Forming Agent
,Question: In water quality, the symbol "mg/L" is equivalent to:
a. Micrograms per liter
b. Parts per million
c. Parts per billion
d. Mostly good levels
Answer: b) Parts per million
Question: The term "clearwell" refers to a?
Answer: Reservoir at the outlet of a water treatment plant.
Question: A mechanical device often employed to prevent the overfilling and/ on over-draining of distribution
system reservoir is the?
Answer: Altitude Valve
Question: The primary cause of water quality deterioration in distribution system is?
Answer: Water age
Question: The top of the pipe is called?
Answer: Soffit
Question: The term "Springline" applies to?
Answer: The midline of a pipeline
Question: When possible, a water main should be tapped while still pressurized to?
Answer: Minimize contamination risk
Question: A connection made into a water main that is full of under pressure is called a?
a. Cross connection
b. Valve box
c. Wet tap
d. Spinal tap
Answer: c) Wet tap
Question: A special valve that is used almost exclusively to facilitate making connections to pipeline is the?
a. Gate valve
b. Corporation stop
c. Altitude valve
d. Auxiliary valve
Answer: b) Corporation Stop
Question: Which of the following gases will deaden the sense of smell?
a. Carbon dioxide
b. Hydrogen sulfide
c. Methane
d. Oxygen
Answer: b) Hydrogen Sulfide
, Question: The most commonly used meter on small domestic services?
a. Venturi meter
b. Propeller meter
c. Orifice plate meter
d. Nutating disc meter
Answer: d) Nutating Disk Meter
Question: Of the following, which is a positive displacement flow rate meter?
Answer: Nutating Disk
Question: A Nutating disk is found in certain?
a. Positive displacement pumps
b. Main line valves
c. Chemical feeders
d. Water meters
Answer: d) Water meters
Question: A pump is experiencing back-spin after it is shut down. What is the most likely cause?
Answer: Malfunction check valve
Question: When fully open, which of the following valve types will have the highest friction loss?
a. Gate valve
b. Globe valve
c. Ball valve
d. All will have about the same friction loss.
Answer: b) Glove valve
Question: The main purpose of a butterfly valve in a water distribution system is for?
Answer: Isolation
Question: The most likely means of connecting two pressure zone is through a?
Answer: Pressure reducing valve
Question: The purpose of an air relief valve is to?
Answer: Protect the pipe system
Question: Which of the following devices is routinely used to reduce system pressure?
Answer: Globe valve
Question: A venture or a weir is a device that is used to ?
Answer: Measured water flow
Question: The most common valve in water distribution system is the?
a. Gate valve
b. Butterfly valve
c. Check valve
d. Globe valve
Answer: a) Gate valve
Latest Update 2026/2027
Question: Potable water may be defined as:
a. Any water that occasionally may be polluted from another
source
b. Any water that, according to recognized standards, is safe
for consumption
c. Water high in organic content
d. Water that has been transported from outside the service
area
Answer: b). Any water that according to recognized standard is safe for human consumption.
Question: To prevent the entry of surface contamination into a well is the purpose of:
a. The well casing
b. The louvers or slots
c. Well development
d. The sanitary seal
Answer: d) The Sanitary Seal
Question: Pure water will exhibit a pH value of?
a. 0.0
b. 7.0
c. 10.5
d. 14.0
Answer: b) 7.0
Question: A pH reading of 6.0 units indicates that the water sample is:
a. Very acidic
b. Slightly alkaline
c. Very alkaline
d. Slightly acidic
Answer: d) Slightly Acidic
Question: In drinking water quality, "TDS" is the abbreviation for? a)Total digestable substances
b) Total dissolved solids
c) Time-delayed sicknesses
d) Terminal diseases started
Answer: b) Total Dissolved Solids
Question: In drinking water regulations, the abbreviation "MCL" stands for?
a) Maximum contaminant level
b) Multiple constituent levels
c) Most common level
d) Minimum considered legal
Answer: a) Maximum contaminant level
Question: The MBAS method is used to determine levels of which of the following drinking water constituents?
Answer: Forming Agent
,Question: In water quality, the symbol "mg/L" is equivalent to:
a. Micrograms per liter
b. Parts per million
c. Parts per billion
d. Mostly good levels
Answer: b) Parts per million
Question: The term "clearwell" refers to a?
Answer: Reservoir at the outlet of a water treatment plant.
Question: A mechanical device often employed to prevent the overfilling and/ on over-draining of distribution
system reservoir is the?
Answer: Altitude Valve
Question: The primary cause of water quality deterioration in distribution system is?
Answer: Water age
Question: The top of the pipe is called?
Answer: Soffit
Question: The term "Springline" applies to?
Answer: The midline of a pipeline
Question: When possible, a water main should be tapped while still pressurized to?
Answer: Minimize contamination risk
Question: A connection made into a water main that is full of under pressure is called a?
a. Cross connection
b. Valve box
c. Wet tap
d. Spinal tap
Answer: c) Wet tap
Question: A special valve that is used almost exclusively to facilitate making connections to pipeline is the?
a. Gate valve
b. Corporation stop
c. Altitude valve
d. Auxiliary valve
Answer: b) Corporation Stop
Question: Which of the following gases will deaden the sense of smell?
a. Carbon dioxide
b. Hydrogen sulfide
c. Methane
d. Oxygen
Answer: b) Hydrogen Sulfide
, Question: The most commonly used meter on small domestic services?
a. Venturi meter
b. Propeller meter
c. Orifice plate meter
d. Nutating disc meter
Answer: d) Nutating Disk Meter
Question: Of the following, which is a positive displacement flow rate meter?
Answer: Nutating Disk
Question: A Nutating disk is found in certain?
a. Positive displacement pumps
b. Main line valves
c. Chemical feeders
d. Water meters
Answer: d) Water meters
Question: A pump is experiencing back-spin after it is shut down. What is the most likely cause?
Answer: Malfunction check valve
Question: When fully open, which of the following valve types will have the highest friction loss?
a. Gate valve
b. Globe valve
c. Ball valve
d. All will have about the same friction loss.
Answer: b) Glove valve
Question: The main purpose of a butterfly valve in a water distribution system is for?
Answer: Isolation
Question: The most likely means of connecting two pressure zone is through a?
Answer: Pressure reducing valve
Question: The purpose of an air relief valve is to?
Answer: Protect the pipe system
Question: Which of the following devices is routinely used to reduce system pressure?
Answer: Globe valve
Question: A venture or a weir is a device that is used to ?
Answer: Measured water flow
Question: The most common valve in water distribution system is the?
a. Gate valve
b. Butterfly valve
c. Check valve
d. Globe valve
Answer: a) Gate valve
