TEXAS WATER OPERATOR LICENSING LEVEL
II CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF
1. What is the primary purpose of chlorination in a water system?
A. Remove hardness
B. Improve taste only
C. Disinfect water
D. Remove turbidity
Answer: C
Chlorination is used to kill pathogens, ensuring safe drinking water.
2. Which chemical is most commonly used for pH adjustment in
drinking water?
A. Chlorine dioxide
B. Sodium hydroxide
C. Ferric chloride
D. Carbon dioxide
Answer: B
Caustic soda increases pH effectively in treatment processes.
3. What must be done before entering a confined space?
,A. Check pH
B. Test atmosphere
C. Perform a chlorine residual test
D. Notify the TCEQ
Answer: B
Atmosphere testing ensures oxygen sufficiency and absence of toxic
gases.
4. The maximum allowable turbidity in filtered water is primarily
regulated to protect against:
A. Hardness
B. Giardia and Cryptosporidium
C. Nitrates
D. Lead leaching
Answer: B
Turbidity reduction protects against protozoan pathogens.
5. Which valve type allows throttling flow?
A. Gate valve
B. Plug valve
C. Ball valve
D. Globe valve
Answer: D
Globe valves are designed for flow control.
6. What is the standard unit for measuring static water pressure?
,A. PSI
B. GPM
C. mg/L
D. NTU
Answer: A
Pressure is measured in pounds per square inch.
7. What is the purpose of a distribution system flush?
A. Remove algae
B. Improve residuals and remove sediments
C. Increase hardness
D. Decrease chlorine demand
Answer: B
Flushing removes accumulated deposits and improves water quality.
8. The chlorine demand of water is defined as:
A. Amount of chlorine remaining after 48 hrs
B. Chlorine added minus chlorine residual
C. Amount needed to remove turbidity
D. Required before adding ammonia
Answer: B
Demand is the difference between applied and residual chlorine.
9. Which is the best location to collect a bacteriological sample?
A. Outside faucets
B. Customer hoses
C. Approved sample tap
, D. Hydrant
Answer: C
Sample taps reduce contamination risk.
10. What is the first step in troubleshooting a pump that won’t start?
A. Replace pump
B. Check power source
C. Replace motor
D. Check packing
Answer: B
Always start with basic electrical checks.
11. A water hammer is primarily caused by:
A. High turbidity
B. Rapid valve closure
C. Low chlorine residual
D. Excessive pH
Answer: B
Sudden changes in flow create pressure surges.
12. The minimum chlorine residual required in a distribution system
is:
A. 0.1 mg/L
B. 0.2 mg/L
C. 0.5 mg/L
D. 4.0 mg/L
II CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A |
INSTANT DOWNLOAD PDF
1. What is the primary purpose of chlorination in a water system?
A. Remove hardness
B. Improve taste only
C. Disinfect water
D. Remove turbidity
Answer: C
Chlorination is used to kill pathogens, ensuring safe drinking water.
2. Which chemical is most commonly used for pH adjustment in
drinking water?
A. Chlorine dioxide
B. Sodium hydroxide
C. Ferric chloride
D. Carbon dioxide
Answer: B
Caustic soda increases pH effectively in treatment processes.
3. What must be done before entering a confined space?
,A. Check pH
B. Test atmosphere
C. Perform a chlorine residual test
D. Notify the TCEQ
Answer: B
Atmosphere testing ensures oxygen sufficiency and absence of toxic
gases.
4. The maximum allowable turbidity in filtered water is primarily
regulated to protect against:
A. Hardness
B. Giardia and Cryptosporidium
C. Nitrates
D. Lead leaching
Answer: B
Turbidity reduction protects against protozoan pathogens.
5. Which valve type allows throttling flow?
A. Gate valve
B. Plug valve
C. Ball valve
D. Globe valve
Answer: D
Globe valves are designed for flow control.
6. What is the standard unit for measuring static water pressure?
,A. PSI
B. GPM
C. mg/L
D. NTU
Answer: A
Pressure is measured in pounds per square inch.
7. What is the purpose of a distribution system flush?
A. Remove algae
B. Improve residuals and remove sediments
C. Increase hardness
D. Decrease chlorine demand
Answer: B
Flushing removes accumulated deposits and improves water quality.
8. The chlorine demand of water is defined as:
A. Amount of chlorine remaining after 48 hrs
B. Chlorine added minus chlorine residual
C. Amount needed to remove turbidity
D. Required before adding ammonia
Answer: B
Demand is the difference between applied and residual chlorine.
9. Which is the best location to collect a bacteriological sample?
A. Outside faucets
B. Customer hoses
C. Approved sample tap
, D. Hydrant
Answer: C
Sample taps reduce contamination risk.
10. What is the first step in troubleshooting a pump that won’t start?
A. Replace pump
B. Check power source
C. Replace motor
D. Check packing
Answer: B
Always start with basic electrical checks.
11. A water hammer is primarily caused by:
A. High turbidity
B. Rapid valve closure
C. Low chlorine residual
D. Excessive pH
Answer: B
Sudden changes in flow create pressure surges.
12. The minimum chlorine residual required in a distribution system
is:
A. 0.1 mg/L
B. 0.2 mg/L
C. 0.5 mg/L
D. 4.0 mg/L
