NGWA Certified Pump Installer (CPI)
Exam Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. A submersible pump is installed but fails to build pressure. What is the
FIRST thing to check?
A. Pump color rating
B. Power supply and voltage at the motor
C. Well casing paint condition
D. Pipe insulation type
Answer: B
Rationale: Electrical supply issues are a primary cause of pump failure and
must be verified first.
2. A pump is cycling on and off rapidly. What is the MOST likely cause?
A. Oversized pressure tank or waterlogged tank
B. Excessively deep well
C. High chlorine levels
D. Oversized discharge pipe
Answer: A
Rationale: Short cycling is commonly caused by pressure tank failure or
incorrect sizing.
3. A newly installed pump produces low water flow. What is the BEST initial
diagnostic step?
A. Replace pump immediately
B. Check for air leaks in suction or drop pipe system
, C. Increase electrical voltage
D. Reduce pump speed permanently
Answer: B
Rationale: Air leaks reduce pump efficiency and flow significantly.
4. A pump motor overheats shortly after startup. What is the MOST likely
cause?
A. Proper lubrication
B. Incorrect voltage or overload condition
C. High water clarity
D. Excess pipe length only
Answer: B
Rationale: Electrical overload or incorrect voltage causes motor
overheating.
5. During installation, sand is found in discharge water. What is the BEST
action?
A. Ignore if flow is good
B. Check well screen integrity and development condition
C. Increase pump speed
D. Reduce pipe diameter
Answer: B
Rationale: Sand indicates well development or screen issues.
6. A pump loses prime repeatedly. What is the FIRST check?
A. Pump paint condition
B. Suction line leaks or foot valve failure
C. Electrical grounding color
D. Tank pressure gauge brand
Answer: B
Rationale: Air entry prevents proper priming.
7. A submersible pump is tripping the breaker. What is the MOST likely cause?
A. Low water temperature
B. Electrical short or motor overload
C. Excess piping insulation
D. High water clarity
, Answer: B
Rationale: Breaker trips indicate electrical faults or overload.
8. A pump system shows fluctuating pressure readings. What is the FIRST
action?
A. Replace pump
B. Inspect pressure switch and tank bladder
C. Increase pump horsepower
D. Shorten piping randomly
Answer: B
Rationale: Pressure instability is often related to control system issues.
9. A well pump is installed but no water is delivered. What is FIRST step?
A. Replace pump
B. Confirm water level and pump setting depth
C. Increase pipe diameter
D. Reduce pump size
Answer: B
Rationale: Incorrect pump placement can prevent water access.
10.A pump runs continuously without shutting off. What is MOST likely cause?
A. High voltage
B. Faulty pressure switch or leak in system
C. Oversized tank only
D. Clean water supply
Answer: B
Rationale: System cannot reach cutoff pressure due to leakage or switch
failure.
11.A customer reports air spitting from faucets. What is MOST likely cause?
A. Electrical grounding issue
B. Air entering suction line or low water level
C. Excess chlorine
D. Pump housing color
Answer: B
Rationale: Air in plumbing indicates suction or water level issues.
, 12.A pump is installed in a deep well but has low efficiency. What is BEST
check?
A. Pipe color
B. Pump curve vs well depth requirement
C. Brand logo
D. Water taste
Answer: B
Rationale: Pump performance must match system curve requirements.
13.A pump vibrates excessively during operation. What is MOST likely cause?
A. Proper alignment
B. Misalignment or loose mounting
C. High water clarity
D. Low voltage protection
Answer: B
Rationale: Mechanical instability causes vibration.
14.A pump produces noisy operation after installation. What is FIRST check?
A. Pipe insulation
B. Cavitation or suction restriction
C. Tank color
D. Water hardness
Answer: B
Rationale: Cavitation is a common cause of pump noise.
15.A pump motor smells hot during operation. What is BEST action?
A. Ignore if running
B. Shut down and check electrical load
C. Increase pressure setting
D. Add water treatment
Answer: B
Rationale: Overheating indicates electrical or mechanical overload.
16.A pump installation has inconsistent flow rates. What is MOST likely issue?
A. Stable aquifer
B. Air entrainment or partial blockage
C. High-quality piping
Exam Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. A submersible pump is installed but fails to build pressure. What is the
FIRST thing to check?
A. Pump color rating
B. Power supply and voltage at the motor
C. Well casing paint condition
D. Pipe insulation type
Answer: B
Rationale: Electrical supply issues are a primary cause of pump failure and
must be verified first.
2. A pump is cycling on and off rapidly. What is the MOST likely cause?
A. Oversized pressure tank or waterlogged tank
B. Excessively deep well
C. High chlorine levels
D. Oversized discharge pipe
Answer: A
Rationale: Short cycling is commonly caused by pressure tank failure or
incorrect sizing.
3. A newly installed pump produces low water flow. What is the BEST initial
diagnostic step?
A. Replace pump immediately
B. Check for air leaks in suction or drop pipe system
, C. Increase electrical voltage
D. Reduce pump speed permanently
Answer: B
Rationale: Air leaks reduce pump efficiency and flow significantly.
4. A pump motor overheats shortly after startup. What is the MOST likely
cause?
A. Proper lubrication
B. Incorrect voltage or overload condition
C. High water clarity
D. Excess pipe length only
Answer: B
Rationale: Electrical overload or incorrect voltage causes motor
overheating.
5. During installation, sand is found in discharge water. What is the BEST
action?
A. Ignore if flow is good
B. Check well screen integrity and development condition
C. Increase pump speed
D. Reduce pipe diameter
Answer: B
Rationale: Sand indicates well development or screen issues.
6. A pump loses prime repeatedly. What is the FIRST check?
A. Pump paint condition
B. Suction line leaks or foot valve failure
C. Electrical grounding color
D. Tank pressure gauge brand
Answer: B
Rationale: Air entry prevents proper priming.
7. A submersible pump is tripping the breaker. What is the MOST likely cause?
A. Low water temperature
B. Electrical short or motor overload
C. Excess piping insulation
D. High water clarity
, Answer: B
Rationale: Breaker trips indicate electrical faults or overload.
8. A pump system shows fluctuating pressure readings. What is the FIRST
action?
A. Replace pump
B. Inspect pressure switch and tank bladder
C. Increase pump horsepower
D. Shorten piping randomly
Answer: B
Rationale: Pressure instability is often related to control system issues.
9. A well pump is installed but no water is delivered. What is FIRST step?
A. Replace pump
B. Confirm water level and pump setting depth
C. Increase pipe diameter
D. Reduce pump size
Answer: B
Rationale: Incorrect pump placement can prevent water access.
10.A pump runs continuously without shutting off. What is MOST likely cause?
A. High voltage
B. Faulty pressure switch or leak in system
C. Oversized tank only
D. Clean water supply
Answer: B
Rationale: System cannot reach cutoff pressure due to leakage or switch
failure.
11.A customer reports air spitting from faucets. What is MOST likely cause?
A. Electrical grounding issue
B. Air entering suction line or low water level
C. Excess chlorine
D. Pump housing color
Answer: B
Rationale: Air in plumbing indicates suction or water level issues.
, 12.A pump is installed in a deep well but has low efficiency. What is BEST
check?
A. Pipe color
B. Pump curve vs well depth requirement
C. Brand logo
D. Water taste
Answer: B
Rationale: Pump performance must match system curve requirements.
13.A pump vibrates excessively during operation. What is MOST likely cause?
A. Proper alignment
B. Misalignment or loose mounting
C. High water clarity
D. Low voltage protection
Answer: B
Rationale: Mechanical instability causes vibration.
14.A pump produces noisy operation after installation. What is FIRST check?
A. Pipe insulation
B. Cavitation or suction restriction
C. Tank color
D. Water hardness
Answer: B
Rationale: Cavitation is a common cause of pump noise.
15.A pump motor smells hot during operation. What is BEST action?
A. Ignore if running
B. Shut down and check electrical load
C. Increase pressure setting
D. Add water treatment
Answer: B
Rationale: Overheating indicates electrical or mechanical overload.
16.A pump installation has inconsistent flow rates. What is MOST likely issue?
A. Stable aquifer
B. Air entrainment or partial blockage
C. High-quality piping
