AWWA Water Treatment Plant
Maintenance Technician Certification Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of preventive maintenance in a water
treatment plant?
A. Increase chemical usage
B. Eliminate all emergency repairs
C. Extend equipment life and reduce unexpected failures
D. Replace all equipment annually
Answer: C
Rationale: Preventive maintenance is designed to reduce
breakdowns and extend the service life of equipment by
performing routine inspections, servicing, and adjustments
before failures occur. It does not eliminate all emergencies but
significantly reduces their frequency.
,2. Which component is most commonly used to remove large debris
from incoming raw water?
A. Sedimentation basin
B. Bar screen
C. Chlorinator
D. Rapid mixer
Answer: B
Rationale: Bar screens are installed at intake structures to
physically remove large debris such as sticks, rags, and trash
before water enters treatment processes.
3. What is the main function of a centrifugal pump in a treatment
plant?
A. Measure chlorine levels
B. Increase water pH
C. Move water through the system
D. Remove dissolved solids
Answer: C
Rationale: Centrifugal pumps are used to transport water by
, converting rotational energy into hydraulic energy, enabling
movement through pipes and treatment units.
4. Which condition is most likely to indicate pump cavitation?
A. Low noise and smooth operation
B. Excessive vibration and rattling noise
C. High discharge pressure
D. Increased chemical dosing
Answer: B
Rationale: Cavitation occurs when vapor bubbles form and
collapse in a pump, producing vibration, noise, and potential
damage to impellers.
5. What is the purpose of lubrication in mechanical equipment?
A. Increase friction between moving parts
B. Reduce wear and heat generation
C. Increase electrical resistance
D. Improve chemical dosing accuracy
Answer: B
Rationale: Lubrication reduces friction between moving parts,
minimizing wear, heat buildup, and mechanical failure.
, 6. Which instrument is commonly used to measure flow rate in a
pipeline?
A. Thermometer
B. Flow meter
C. Manometer
D. Turbidity tube
Answer: B
Rationale: Flow meters are designed specifically to measure the
rate of fluid movement through a system.
7. What is the primary purpose of a check valve?
A. Increase pressure
B. Prevent reverse flow
C. Measure flow rate
D. Remove sediment
Answer: B
Rationale: Check valves allow flow in only one direction,
preventing backflow that could damage equipment or
contaminate processes.
Maintenance Technician Certification Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What is the primary purpose of preventive maintenance in a water
treatment plant?
A. Increase chemical usage
B. Eliminate all emergency repairs
C. Extend equipment life and reduce unexpected failures
D. Replace all equipment annually
Answer: C
Rationale: Preventive maintenance is designed to reduce
breakdowns and extend the service life of equipment by
performing routine inspections, servicing, and adjustments
before failures occur. It does not eliminate all emergencies but
significantly reduces their frequency.
,2. Which component is most commonly used to remove large debris
from incoming raw water?
A. Sedimentation basin
B. Bar screen
C. Chlorinator
D. Rapid mixer
Answer: B
Rationale: Bar screens are installed at intake structures to
physically remove large debris such as sticks, rags, and trash
before water enters treatment processes.
3. What is the main function of a centrifugal pump in a treatment
plant?
A. Measure chlorine levels
B. Increase water pH
C. Move water through the system
D. Remove dissolved solids
Answer: C
Rationale: Centrifugal pumps are used to transport water by
, converting rotational energy into hydraulic energy, enabling
movement through pipes and treatment units.
4. Which condition is most likely to indicate pump cavitation?
A. Low noise and smooth operation
B. Excessive vibration and rattling noise
C. High discharge pressure
D. Increased chemical dosing
Answer: B
Rationale: Cavitation occurs when vapor bubbles form and
collapse in a pump, producing vibration, noise, and potential
damage to impellers.
5. What is the purpose of lubrication in mechanical equipment?
A. Increase friction between moving parts
B. Reduce wear and heat generation
C. Increase electrical resistance
D. Improve chemical dosing accuracy
Answer: B
Rationale: Lubrication reduces friction between moving parts,
minimizing wear, heat buildup, and mechanical failure.
, 6. Which instrument is commonly used to measure flow rate in a
pipeline?
A. Thermometer
B. Flow meter
C. Manometer
D. Turbidity tube
Answer: B
Rationale: Flow meters are designed specifically to measure the
rate of fluid movement through a system.
7. What is the primary purpose of a check valve?
A. Increase pressure
B. Prevent reverse flow
C. Measure flow rate
D. Remove sediment
Answer: B
Rationale: Check valves allow flow in only one direction,
preventing backflow that could damage equipment or
contaminate processes.
