Texas Class C Surface Water Exam
Review QUESTIONS WITH CORRECT
SOLUTIONS||100% GUARANTEED
PASS||UPDATED 2026/2027
SYLLABUS||ALREADY GRADED
A+||<<NEWEST VERSION>>
Polyphosphates may be used in water treatment to retard corrosion and: -
ANSWER ✓ Calcium scale
Calcium hypochlorite is formulated as a: - ANSWER ✓ Powder
Chlorine leaks in metal containers tend to become: - ANSWER ✓ Larger
Determining the pH of water is one of the important tests of water quality. The
results of the pH test indicate the: - ANSWER ✓ Hydrogen ion activity
Alkalinity is a direct measure of water's capability to resists changes in: -
ANSWER ✓ pH (acidity)
Leakage form a packing gland should be approximately: - ANSWER ✓ One drop
per second
A chlorine cylinder valve is thought to be leaking. If ammonia vapor is passed
near the valve, the presence of a leak would be indicated by: - ANSWER ✓ White
smoke
If a fire hydrant requires a nozzle pressure of 100 psi, what head of water must be
used to supply it? - ANSWER ✓ 231 ft.
Which type of pipe is most likely to be damaged by corrosion? - ANSWER ✓
Steel
, Carbon dioxide in water will do what to the pH? - ANSWER ✓ Lower the pH
A pneumatic ejector lifts water from low points to higher levels. The device used
to achieve this is a(n)? - ANSWER ✓ Air compressor
Pressure is commonly measured in: - ANSWER ✓ Pounds per square in (psi)
Mechanical seals are being installed in pumps because: - ANSWER ✓ Packing
requires an undesirable leakage that seals eliminate
Which of the following items must be placed when connecting a new chlorine
cylinder? (Air and water regulator; fiber washer; needle valve and seat; pressure
regulator) - ANSWER ✓ Fiber washer
A major cause of pump and motor shaft coupling wear is a: - ANSWER ✓
Misalignment between pumps and motor flanges
Filters in a water treatment process are primarily for removing or reducing what? -
ANSWER ✓ Turbidity
A water treatment plant receives an average flow of 261 gallons per minute. What
is the daily flow of the plant? - ANSWER ✓ 0.38 MGD (rounded)
The free chlorine residual in water is the amount of: - ANSWER ✓ Uncombined
chlorine that remains in the water after chlorine has been applied and allowed to
react
The chemical name for muriatic acid is what? - ANSWER ✓ Hydrochloric acid
A chlorine residual in water can be determined by using the reagent: - ANSWER
✓ DPD - diethyl-p-pheylenediamine
The most important use of chlorine in water treatment is what? - ANSWER ✓
Disinfectant
What is the approximate volume in gallons occupied by 15,000 ft^3 of water? -
ANSWER ✓ 112,200 gallons
Review QUESTIONS WITH CORRECT
SOLUTIONS||100% GUARANTEED
PASS||UPDATED 2026/2027
SYLLABUS||ALREADY GRADED
A+||<<NEWEST VERSION>>
Polyphosphates may be used in water treatment to retard corrosion and: -
ANSWER ✓ Calcium scale
Calcium hypochlorite is formulated as a: - ANSWER ✓ Powder
Chlorine leaks in metal containers tend to become: - ANSWER ✓ Larger
Determining the pH of water is one of the important tests of water quality. The
results of the pH test indicate the: - ANSWER ✓ Hydrogen ion activity
Alkalinity is a direct measure of water's capability to resists changes in: -
ANSWER ✓ pH (acidity)
Leakage form a packing gland should be approximately: - ANSWER ✓ One drop
per second
A chlorine cylinder valve is thought to be leaking. If ammonia vapor is passed
near the valve, the presence of a leak would be indicated by: - ANSWER ✓ White
smoke
If a fire hydrant requires a nozzle pressure of 100 psi, what head of water must be
used to supply it? - ANSWER ✓ 231 ft.
Which type of pipe is most likely to be damaged by corrosion? - ANSWER ✓
Steel
, Carbon dioxide in water will do what to the pH? - ANSWER ✓ Lower the pH
A pneumatic ejector lifts water from low points to higher levels. The device used
to achieve this is a(n)? - ANSWER ✓ Air compressor
Pressure is commonly measured in: - ANSWER ✓ Pounds per square in (psi)
Mechanical seals are being installed in pumps because: - ANSWER ✓ Packing
requires an undesirable leakage that seals eliminate
Which of the following items must be placed when connecting a new chlorine
cylinder? (Air and water regulator; fiber washer; needle valve and seat; pressure
regulator) - ANSWER ✓ Fiber washer
A major cause of pump and motor shaft coupling wear is a: - ANSWER ✓
Misalignment between pumps and motor flanges
Filters in a water treatment process are primarily for removing or reducing what? -
ANSWER ✓ Turbidity
A water treatment plant receives an average flow of 261 gallons per minute. What
is the daily flow of the plant? - ANSWER ✓ 0.38 MGD (rounded)
The free chlorine residual in water is the amount of: - ANSWER ✓ Uncombined
chlorine that remains in the water after chlorine has been applied and allowed to
react
The chemical name for muriatic acid is what? - ANSWER ✓ Hydrochloric acid
A chlorine residual in water can be determined by using the reagent: - ANSWER
✓ DPD - diethyl-p-pheylenediamine
The most important use of chlorine in water treatment is what? - ANSWER ✓
Disinfectant
What is the approximate volume in gallons occupied by 15,000 ft^3 of water? -
ANSWER ✓ 112,200 gallons
