Water Distribution “C” Course Exam
With Full Set Verified Answers| 2026
Update| Guaranteed Pass
The minimum residual water pressure required by the Rules and
Regulations for Public Water Systems (30 TAC Chapter 290 subchapter D)
is _____.
a. 40 psi at all times
b. 20 psi under peak demand conditions
c. 200 gallons per day
35 psi under peak demand conditions - Ans--b. 20 psi under peak demand
conditions
Dead end mains should be flushed every _____.
a. day
b. week
c. month
d. 4th of July - Ans--c. month
Water hardness is caused by _____.
a. suspended solids
b. improper treatment
c. too much chlorine
d. calcium and magnesium salts - Ans--d. calcium and magnesium salts
Transpiration is _____.
a. the release of water vapor into the air by plants
b. breathing
c. dying
d. moving water from one place to another - Ans--a. the release of water
vapor into the air by plants
The presence of nitrates in water can cause _____.
a. typhoid
, b. cancer
c. blue babies
d. none listed - Ans--c. blue babies
The federal agency that provides standards for the maximum allowable
concentration of inorganic chemicals in potable water is _____.
a. the Texas Department of Health
b. the Environmental Protection Agency
c. the Texas Commission on Environmental Quality
d. the Texas Department of Water Resources - Ans--b. the Environmental
Protection Agency
The term "head" as applied to water pressure means _____.
a. foam on top of the water in a tank
b. the distance water must travel
c. height in feet of the water column
d. dynamic pressure - Ans--c. height in feet of the water column
The four common classes of working pressure in water mains are _____.
a. 100, 150, 200, and 250 psi
b. 25, 50, 75,and 100 psi
c. 50, 100, 150, and 200 psi
d. 100, 200, 300, and 400 psi - Ans--a. 100, 150, 200, and 250 psi
Surface load is _____.
a. the weight of backfill on the pipe
b. the protective finish on the pipe
c. the weight of traffic on the pipe
d. the weight of the pipe on the truck - Ans--c. the weight of traffic on the
pipe
Check valves on the discharge side of a pump _____.
a. check on how much water is flowing through the pipe
b. check on the water velocity
c. stop the flow of water in case of flooding
d. keep water from flowing back through the pump when it is shut off - Ans--
d. keep water from flowing back through the pump when it is shut off
With Full Set Verified Answers| 2026
Update| Guaranteed Pass
The minimum residual water pressure required by the Rules and
Regulations for Public Water Systems (30 TAC Chapter 290 subchapter D)
is _____.
a. 40 psi at all times
b. 20 psi under peak demand conditions
c. 200 gallons per day
35 psi under peak demand conditions - Ans--b. 20 psi under peak demand
conditions
Dead end mains should be flushed every _____.
a. day
b. week
c. month
d. 4th of July - Ans--c. month
Water hardness is caused by _____.
a. suspended solids
b. improper treatment
c. too much chlorine
d. calcium and magnesium salts - Ans--d. calcium and magnesium salts
Transpiration is _____.
a. the release of water vapor into the air by plants
b. breathing
c. dying
d. moving water from one place to another - Ans--a. the release of water
vapor into the air by plants
The presence of nitrates in water can cause _____.
a. typhoid
, b. cancer
c. blue babies
d. none listed - Ans--c. blue babies
The federal agency that provides standards for the maximum allowable
concentration of inorganic chemicals in potable water is _____.
a. the Texas Department of Health
b. the Environmental Protection Agency
c. the Texas Commission on Environmental Quality
d. the Texas Department of Water Resources - Ans--b. the Environmental
Protection Agency
The term "head" as applied to water pressure means _____.
a. foam on top of the water in a tank
b. the distance water must travel
c. height in feet of the water column
d. dynamic pressure - Ans--c. height in feet of the water column
The four common classes of working pressure in water mains are _____.
a. 100, 150, 200, and 250 psi
b. 25, 50, 75,and 100 psi
c. 50, 100, 150, and 200 psi
d. 100, 200, 300, and 400 psi - Ans--a. 100, 150, 200, and 250 psi
Surface load is _____.
a. the weight of backfill on the pipe
b. the protective finish on the pipe
c. the weight of traffic on the pipe
d. the weight of the pipe on the truck - Ans--c. the weight of traffic on the
pipe
Check valves on the discharge side of a pump _____.
a. check on how much water is flowing through the pipe
b. check on the water velocity
c. stop the flow of water in case of flooding
d. keep water from flowing back through the pump when it is shut off - Ans--
d. keep water from flowing back through the pump when it is shut off
