South Carolina Irrigation Pump Installer
Certification License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which component of an irrigation pump system is primarily
responsible for creating the hydraulic pressure needed to move water
through the system?
A. Check valve
B. Impeller
C. Pressure gauge
D. Foot valve
The impeller is the rotating component inside a pump that imparts energy
to the water, creating the pressure necessary to move it through the
irrigation system.
2. What is the primary purpose of a pump’s intake screen or strainer?
A. Increase water pressure
B. Reduce noise
C. Prevent debris from entering the pump
D. Measure flow rate
Intake screens or strainers block debris and foreign material from entering
the pump, protecting internal components and preventing damage.
, 3. When sizing an irrigation pump, which of the following factors must be
considered?
A. Color of the pump
B. Total dynamic head and required flow rate
C. Brand of the control panel
D. Type of fuel used by nearby equipment
Proper pump sizing requires calculating the total dynamic head (elevation,
friction loss) and the required flow rate to ensure the pump meets system
demands.
4. In a centrifugal pump, what happens if the pump is operated with a
closed discharge valve?
A. Flow increases
B. Pressure increases and heat builds up, potentially damaging the
pump
C. The pump becomes more efficient
D. It starts self-priming
Operating a centrifugal pump against a closed discharge causes pressure
to rise inside the pump, increasing heat and risking damage to seals and
the impeller.
5. Which of the following devices is used to prevent backflow of water
into the source supply?
A. Flow meter
B. Check valve
C. Backflow preventer
D. Pressure switch
A backflow preventer ensures that irrigation water does not flow
backward into the potable water supply, protecting water quality.
6. What is the main advantage of a variable frequency drive (VFD) on an
irrigation pump motor?
A. Reduces pipe friction
, B. Allows precise control of pump speed for energy savings
C. Eliminates the need for a pressure switch
D. Increases the diameter of the discharge pipe
A VFD adjusts motor speed to match system demand, which improves
energy efficiency and maintains desired pressure levels.
7. What type of pump is most commonly used for deep well irrigation
installations?
A. Peristaltic pump
B. Submersible centrifugal pump
C. Reciprocating pump
D. Hydraulic ram pump
Submersible centrifugal pumps are widely used for deep wells because
they can operate underwater and handle high pressures and depths.
8. Total dynamic head (TDH) includes which of the following?
A. Only friction losses
B. Static head, friction losses, and pressure requirements
C. Only static head
D. Only pipe diameter
TDH accounts for the vertical lift (static head), friction losses through
pipes/fittings, and pressure needs at the outlet.
9. A pressure switch on a pump system is used to:
A. Increase water temperature
B. Control voltage to the motor
C. Start and stop the pump based on pressure settings
D. Measure flow rate
Pressure switches monitor system pressure and activate or deactivate the
pump to maintain set pressure levels.
10. What is the function of a check valve installed on the pump
discharge line?
Certification License Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which component of an irrigation pump system is primarily
responsible for creating the hydraulic pressure needed to move water
through the system?
A. Check valve
B. Impeller
C. Pressure gauge
D. Foot valve
The impeller is the rotating component inside a pump that imparts energy
to the water, creating the pressure necessary to move it through the
irrigation system.
2. What is the primary purpose of a pump’s intake screen or strainer?
A. Increase water pressure
B. Reduce noise
C. Prevent debris from entering the pump
D. Measure flow rate
Intake screens or strainers block debris and foreign material from entering
the pump, protecting internal components and preventing damage.
, 3. When sizing an irrigation pump, which of the following factors must be
considered?
A. Color of the pump
B. Total dynamic head and required flow rate
C. Brand of the control panel
D. Type of fuel used by nearby equipment
Proper pump sizing requires calculating the total dynamic head (elevation,
friction loss) and the required flow rate to ensure the pump meets system
demands.
4. In a centrifugal pump, what happens if the pump is operated with a
closed discharge valve?
A. Flow increases
B. Pressure increases and heat builds up, potentially damaging the
pump
C. The pump becomes more efficient
D. It starts self-priming
Operating a centrifugal pump against a closed discharge causes pressure
to rise inside the pump, increasing heat and risking damage to seals and
the impeller.
5. Which of the following devices is used to prevent backflow of water
into the source supply?
A. Flow meter
B. Check valve
C. Backflow preventer
D. Pressure switch
A backflow preventer ensures that irrigation water does not flow
backward into the potable water supply, protecting water quality.
6. What is the main advantage of a variable frequency drive (VFD) on an
irrigation pump motor?
A. Reduces pipe friction
, B. Allows precise control of pump speed for energy savings
C. Eliminates the need for a pressure switch
D. Increases the diameter of the discharge pipe
A VFD adjusts motor speed to match system demand, which improves
energy efficiency and maintains desired pressure levels.
7. What type of pump is most commonly used for deep well irrigation
installations?
A. Peristaltic pump
B. Submersible centrifugal pump
C. Reciprocating pump
D. Hydraulic ram pump
Submersible centrifugal pumps are widely used for deep wells because
they can operate underwater and handle high pressures and depths.
8. Total dynamic head (TDH) includes which of the following?
A. Only friction losses
B. Static head, friction losses, and pressure requirements
C. Only static head
D. Only pipe diameter
TDH accounts for the vertical lift (static head), friction losses through
pipes/fittings, and pressure needs at the outlet.
9. A pressure switch on a pump system is used to:
A. Increase water temperature
B. Control voltage to the motor
C. Start and stop the pump based on pressure settings
D. Measure flow rate
Pressure switches monitor system pressure and activate or deactivate the
pump to maintain set pressure levels.
10. What is the function of a check valve installed on the pump
discharge line?
