AR PI Pump Installer Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a pump in a fluid system?
A. Increase temperature
B. Increase pressure
C. Decrease flow
D. Reduce friction
B. Increase pressure
Rationale: Pumps are designed to add energy to a fluid, primarily by
increasing its pressure to enable flow through a system.
2. Which type of pump is most suitable for moving viscous liquids?
A. Centrifugal
B. Gear
C. Piston
D. Diaphragm
B. Gear
Rationale: Gear pumps are positive displacement pumps ideal for high-
viscosity fluids because they provide a steady flow regardless of viscosity.
3. What is the primary safety concern when installing a pump?
A. Noise levels
B. Electrical shock
C. Color of pump
D. Pipe size
,B. Electrical shock
Rationale: Pumps often involve high-voltage electrical connections,
making shock prevention a primary safety concern during installation.
4. What component prevents backflow in a pump system?
A. Relief valve
B. Check valve
C. Gate valve
D. Strainer
B. Check valve
Rationale: A check valve allows fluid to flow in only one direction,
preventing backflow that could damage the pump.
5. How often should routine maintenance be performed on a pump
according to standard guidelines?
A. Once a year
B. Every month
C. According to manufacturer recommendations
D. Only when it fails
C. According to manufacturer recommendations
Rationale: Regular maintenance intervals depend on manufacturer
guidelines, which ensure safe and efficient pump operation.
6. Which pump type is commonly used for high flow, low head
applications?
A. Centrifugal
B. Piston
C. Gear
D. Screw
A. Centrifugal
Rationale: Centrifugal pumps are ideal for moving large volumes of fluid
at low pressure (low head) applications.
7. What does NPSH stand for in pump terminology?
A. Net Positive Suction Head
, B. Normal Pump Safety Hazard
C. Nominal Pressure System Height
D. Net Pump System Heat
A. Net Positive Suction Head
Rationale: NPSH is a critical value to prevent cavitation in pumps,
representing the absolute pressure at the suction port.
8. Cavitation in a pump is caused by:
A. Excessive lubrication
B. Air bubbles forming and collapsing
C. Overheating of motor windings
D. Low ambient temperature
B. Air bubbles forming and collapsing
Rationale: Cavitation occurs when vapor bubbles form in low-pressure
areas and collapse, potentially damaging pump components.
9. Which material is most resistant to corrosion in pump components?
A. Stainless steel
B. Aluminum
C. Brass
D. Cast iron
A. Stainless steel
Rationale: Stainless steel resists corrosion from water and chemicals,
making it ideal for pump parts exposed to fluids.
10. What is the recommended method to prime a centrifugal pump?
A. Start pump dry
B. Fill pump casing with liquid before starting
C. Use compressed air
D. Turn off valves
B. Fill pump casing with liquid before starting
Rationale: Priming prevents air pockets that could cause cavitation or
pump damage.
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a pump in a fluid system?
A. Increase temperature
B. Increase pressure
C. Decrease flow
D. Reduce friction
B. Increase pressure
Rationale: Pumps are designed to add energy to a fluid, primarily by
increasing its pressure to enable flow through a system.
2. Which type of pump is most suitable for moving viscous liquids?
A. Centrifugal
B. Gear
C. Piston
D. Diaphragm
B. Gear
Rationale: Gear pumps are positive displacement pumps ideal for high-
viscosity fluids because they provide a steady flow regardless of viscosity.
3. What is the primary safety concern when installing a pump?
A. Noise levels
B. Electrical shock
C. Color of pump
D. Pipe size
,B. Electrical shock
Rationale: Pumps often involve high-voltage electrical connections,
making shock prevention a primary safety concern during installation.
4. What component prevents backflow in a pump system?
A. Relief valve
B. Check valve
C. Gate valve
D. Strainer
B. Check valve
Rationale: A check valve allows fluid to flow in only one direction,
preventing backflow that could damage the pump.
5. How often should routine maintenance be performed on a pump
according to standard guidelines?
A. Once a year
B. Every month
C. According to manufacturer recommendations
D. Only when it fails
C. According to manufacturer recommendations
Rationale: Regular maintenance intervals depend on manufacturer
guidelines, which ensure safe and efficient pump operation.
6. Which pump type is commonly used for high flow, low head
applications?
A. Centrifugal
B. Piston
C. Gear
D. Screw
A. Centrifugal
Rationale: Centrifugal pumps are ideal for moving large volumes of fluid
at low pressure (low head) applications.
7. What does NPSH stand for in pump terminology?
A. Net Positive Suction Head
, B. Normal Pump Safety Hazard
C. Nominal Pressure System Height
D. Net Pump System Heat
A. Net Positive Suction Head
Rationale: NPSH is a critical value to prevent cavitation in pumps,
representing the absolute pressure at the suction port.
8. Cavitation in a pump is caused by:
A. Excessive lubrication
B. Air bubbles forming and collapsing
C. Overheating of motor windings
D. Low ambient temperature
B. Air bubbles forming and collapsing
Rationale: Cavitation occurs when vapor bubbles form in low-pressure
areas and collapse, potentially damaging pump components.
9. Which material is most resistant to corrosion in pump components?
A. Stainless steel
B. Aluminum
C. Brass
D. Cast iron
A. Stainless steel
Rationale: Stainless steel resists corrosion from water and chemicals,
making it ideal for pump parts exposed to fluids.
10. What is the recommended method to prime a centrifugal pump?
A. Start pump dry
B. Fill pump casing with liquid before starting
C. Use compressed air
D. Turn off valves
B. Fill pump casing with liquid before starting
Rationale: Priming prevents air pockets that could cause cavitation or
pump damage.
