WATER DISTRIBUTION TEST WITH
COMPLETE SOLUTIONS
What is the minimum setback distance for fire hydrants to avoid large vehicle overhang?
a. 1 ½ -feet
b. 2-feet
c. 3-feet
d. 3.5-feet - Answer-b. 2-feet
The primary reason for using dry barrel fire hydrants is to
a. allow easy maintenance of the hydrant
b. prevent water hammer
c. keep the barrel from rusting
d. keep the barrel from freezing in cold weather - Answer-d. keep the barrel from
freezing in cold weather
Wet-barrel hydrants
a. have slide gate main valves
b. have main toggle valves
c. have standard compression main valves d. do not have main valves, but separate
nozzle valves - Answer-d. do not have main valves, but separate nozzle valves
When a 150-pound chlorine cylinder fitting slightly leaks around the gasket material, a
gauze like material soaked in _______ should be used below the fittings to confirm the
leak at the joint.
a. chlorine dioxide
b. sodium thiosulfate
c. ammonia water
d. oil - Answer-c. ammonia water
A commonly used method to test for chlorine residual in water is called the _____
method.
a. HTH
b. THM
c. VOC
d. DPD - Answer-d. DPD
As the pump shaft protrudes through the pump case, a mesh ring can be placed and
compressed to prevent excessive leakage. This ring is commonly called the
a. mechanical ring
, b. packing ring
c. free ring
d. bearing ring - Answer-b. packing ring
When chlorine gas is added to water the pH goes down due to
a. chlorine gas producing caustic substances
b. two base materials that form
c. two acids that form
d. caustic soda being formed in the water - Answer-c. two acids that form
Water with a pH of 7.9 is considered to be
a. acidic
b. basic or alkaline
c. neutral
d. undrinkable - Answer-b. basic or alkaline
A 5-foot deep pipe trench requires exit ladders every 25-feet and it needs to
a. have approved shoring
b. have exit ramps
c. have hoists every 10-25 feet
d. have an ambulance in a stand-by mode - Answer-a. have approved shoring
Distribution systems are usually laid out in which of the following patterns besides Tree
shaped and Grid designs?
a. Loops and/or circular designs
b. Vertical designs without backflow prevention devices
c. Horizontal lines that flow into open ponds then back into a closed pipe
d. Horizontal lines that flow into underground sumps then back into a closed pipe -
Answer-a. Loops and/or circular designs
Dead ends in a system are usually located on
a. Loops and/or circular designs
b. Tree shaped and Grid designs
c. Oval designs
d. transmission mains
e. Cul de Sac's with return lines - Answer-b. Tree shaped and Grid designs
An operator may refer to Piezometric elevation, static head, or pressure head as
a. horizontal water elevation
b. water pressure from a pump
c. maximum pressure from a fire hydrant
d. vertical water column height - Answer-d. vertical water column height
A downstream closed sectionalizing valve without pressure reducing valves in the
system will have which of the following pressures placed upon it?
COMPLETE SOLUTIONS
What is the minimum setback distance for fire hydrants to avoid large vehicle overhang?
a. 1 ½ -feet
b. 2-feet
c. 3-feet
d. 3.5-feet - Answer-b. 2-feet
The primary reason for using dry barrel fire hydrants is to
a. allow easy maintenance of the hydrant
b. prevent water hammer
c. keep the barrel from rusting
d. keep the barrel from freezing in cold weather - Answer-d. keep the barrel from
freezing in cold weather
Wet-barrel hydrants
a. have slide gate main valves
b. have main toggle valves
c. have standard compression main valves d. do not have main valves, but separate
nozzle valves - Answer-d. do not have main valves, but separate nozzle valves
When a 150-pound chlorine cylinder fitting slightly leaks around the gasket material, a
gauze like material soaked in _______ should be used below the fittings to confirm the
leak at the joint.
a. chlorine dioxide
b. sodium thiosulfate
c. ammonia water
d. oil - Answer-c. ammonia water
A commonly used method to test for chlorine residual in water is called the _____
method.
a. HTH
b. THM
c. VOC
d. DPD - Answer-d. DPD
As the pump shaft protrudes through the pump case, a mesh ring can be placed and
compressed to prevent excessive leakage. This ring is commonly called the
a. mechanical ring
, b. packing ring
c. free ring
d. bearing ring - Answer-b. packing ring
When chlorine gas is added to water the pH goes down due to
a. chlorine gas producing caustic substances
b. two base materials that form
c. two acids that form
d. caustic soda being formed in the water - Answer-c. two acids that form
Water with a pH of 7.9 is considered to be
a. acidic
b. basic or alkaline
c. neutral
d. undrinkable - Answer-b. basic or alkaline
A 5-foot deep pipe trench requires exit ladders every 25-feet and it needs to
a. have approved shoring
b. have exit ramps
c. have hoists every 10-25 feet
d. have an ambulance in a stand-by mode - Answer-a. have approved shoring
Distribution systems are usually laid out in which of the following patterns besides Tree
shaped and Grid designs?
a. Loops and/or circular designs
b. Vertical designs without backflow prevention devices
c. Horizontal lines that flow into open ponds then back into a closed pipe
d. Horizontal lines that flow into underground sumps then back into a closed pipe -
Answer-a. Loops and/or circular designs
Dead ends in a system are usually located on
a. Loops and/or circular designs
b. Tree shaped and Grid designs
c. Oval designs
d. transmission mains
e. Cul de Sac's with return lines - Answer-b. Tree shaped and Grid designs
An operator may refer to Piezometric elevation, static head, or pressure head as
a. horizontal water elevation
b. water pressure from a pump
c. maximum pressure from a fire hydrant
d. vertical water column height - Answer-d. vertical water column height
A downstream closed sectionalizing valve without pressure reducing valves in the
system will have which of the following pressures placed upon it?
