CLASS D WATER OPERATOR LICENSE EXAM
TCEQ QUESTIONS AND CORRECT ANSWERS
T/F: In Texas, about 75% of all water is used for commercial, industrial, or
agricultural purposes. - answer>>>True
Which of the following is part of a hypochlorination system?
a) solution feed pump
b) gas cylinder
c) rotameter
d) injector/ejector
e) all of the above - answer>>>a) solution feed pump
An elevated storage tank should be protected against corrosion by:
a) painting
b) cathodic protection
c) water stabilization
d) all of the above
e) galvanizing - answer>>>d) all of the above (painting, cathodic
protection, and water stabilization)
The pH of water indicates whether it is acidic or basic and is expressed by
a scale of numbers ranging from:
a) 0 - 7
b) 0 - 14
c) 1 - 7
d) 1 - 14
,e) none of the above - answer>>>b) 0 - 14
Before a new main is placed into service, it must be properly disinfected
with a minimum chlorine dosage of:
a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L - answer>>>a) 50 mg/L
A common chemical used for disinfecting a small public water supply is:
a) soda ash
b) copper sulfate
c) sodium hypochlorite
d) fluoride
e) sodium chloride - answer>>>c) sodium hypochlorite
Gravity filters will remove which of the following from surface water
supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides - answer>>>a) turbidity
If you added 3.5 mg/L of chlorine to your storage tank and 30 minutes later
measured the residual at 1.2 mg/L, what was the chlorine demand in the
tank?
, a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 - answer>>>d) 2.3
Your ground storage tank is 15 feet high and 30 feet in diameter. About
how much water can it hold?
a) 31,700 gallons
b) 79,270 gallons
c) 50, 490 gallons
d) 25,150 gallons
e) 10,600 gallons - answer>>>...79,270 gallons
When fecal coliform organisms are found in a water supply, it is an
indication that:
a) the water supply is contaminated
b) pathogenic organisms might be present
c) the water may be unsuitable for drinking
d) follow-up sampling must take place
e) all of the above - answer>>>e) all of the above
Which of the following is an acceptable level of residual chlorine in the far
reaches of a distribution system?
a) 0.2 mg/L of free chlorine for a small GWS
b) 0.5 mg/L of chloramine for a large SWS
c) 1.0 mg/L of combined when using ammoniation facilities
d) 1.0 mg/L of total for a large SWS
TCEQ QUESTIONS AND CORRECT ANSWERS
T/F: In Texas, about 75% of all water is used for commercial, industrial, or
agricultural purposes. - answer>>>True
Which of the following is part of a hypochlorination system?
a) solution feed pump
b) gas cylinder
c) rotameter
d) injector/ejector
e) all of the above - answer>>>a) solution feed pump
An elevated storage tank should be protected against corrosion by:
a) painting
b) cathodic protection
c) water stabilization
d) all of the above
e) galvanizing - answer>>>d) all of the above (painting, cathodic
protection, and water stabilization)
The pH of water indicates whether it is acidic or basic and is expressed by
a scale of numbers ranging from:
a) 0 - 7
b) 0 - 14
c) 1 - 7
d) 1 - 14
,e) none of the above - answer>>>b) 0 - 14
Before a new main is placed into service, it must be properly disinfected
with a minimum chlorine dosage of:
a) 50 mg/L
b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L - answer>>>a) 50 mg/L
A common chemical used for disinfecting a small public water supply is:
a) soda ash
b) copper sulfate
c) sodium hypochlorite
d) fluoride
e) sodium chloride - answer>>>c) sodium hypochlorite
Gravity filters will remove which of the following from surface water
supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides - answer>>>a) turbidity
If you added 3.5 mg/L of chlorine to your storage tank and 30 minutes later
measured the residual at 1.2 mg/L, what was the chlorine demand in the
tank?
, a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 - answer>>>d) 2.3
Your ground storage tank is 15 feet high and 30 feet in diameter. About
how much water can it hold?
a) 31,700 gallons
b) 79,270 gallons
c) 50, 490 gallons
d) 25,150 gallons
e) 10,600 gallons - answer>>>...79,270 gallons
When fecal coliform organisms are found in a water supply, it is an
indication that:
a) the water supply is contaminated
b) pathogenic organisms might be present
c) the water may be unsuitable for drinking
d) follow-up sampling must take place
e) all of the above - answer>>>e) all of the above
Which of the following is an acceptable level of residual chlorine in the far
reaches of a distribution system?
a) 0.2 mg/L of free chlorine for a small GWS
b) 0.5 mg/L of chloramine for a large SWS
c) 1.0 mg/L of combined when using ammoniation facilities
d) 1.0 mg/L of total for a large SWS
