Texas General Pump Installer Exam 2026
(TDLR Format) | Practice Questions with
Answers, Detailed Rationales &
Complete PDF Study Guide
TEXAS GENERAL PUMP INSTALLER EXAM 2026 (TDLR FORMAT)
Practice Questions with Answers & Detailed EXPERT RATIONALE
This practice guide mirrors the TDLR General Pump Installer licensing exam and
covers every tested domain to help you build confidence and pass on your first
attempt. Work through each question carefully, review every EXPERT RATIONALE —
even for questions you get right — and you will walk into the exam fully prepared.
SECTION 1: PUMP FUNDAMENTALS & CLASSIFICATIONS
Question 1 Which type of pump operates by trapping a fixed amount of fluid and
displacing it through the discharge?
A. Centrifugal pump
B. Axial flow pump
C. D. Positive displacement pump
D. Positive displacement pump
E. Mixed flow pump
Correct Answer: D. Positive displacement pump EXPERT RATIONALE: Positive
displacement pumps trap a fixed volume of fluid and force it through the outlet
with each cycle, making them ideal for high-pressure, low-flow applications
regardless of system pressure.
Question 2 A centrifugal pump moves fluid by which principle?
, A. Reciprocating pistons
B. Gear meshing action
C. Diaphragm flexing
D. Peristaltic squeezing
E. Centrifugal force from a rotating impeller
Correct Answer: E. Centrifugal force from a rotating impeller EXPERT
RATIONALE: Centrifugal pumps use a spinning impeller to impart velocity to fluid.
That velocity converts to pressure as fluid exits the volute casing, enabling
continuous flow.
Question 3 What term describes the total equivalent head a pump must overcome
in a system?
A. Static head only
B. Velocity head only
C. Total dynamic head (TDH)
D. Suction lift
E. Net positive suction head
Correct Answer: C. Total dynamic head (TDH) EXPERT RATIONALE: TDH is the
sum of static head, friction losses, and velocity head. It represents the complete
work a pump must perform and is used to select the correct pump for an
installation.
Question 4 Which pump classification is best suited for high-flow, low-pressure
agricultural irrigation systems?
A. Axial flow (propeller) pump
B. Reciprocating piston pump
, C. Gear pump
D. Diaphragm pump
E. Progressive cavity pump
Correct Answer: A. Axial flow (propeller) pump EXPERT RATIONALE: Axial flow
pumps move large volumes of water at low head by propelling fluid parallel to the
shaft axis, making them the standard choice for flood irrigation and drainage
applications.
Question 5 What is the maximum practical suction lift for a centrifugal pump at sea
level under normal conditions?
A. 5 feet
B. 10 feet
C. 20 feet
D. 25 feet
E. 33.9 feet
Correct Answer: D. 25 feet EXPERT RATIONALE: While atmospheric pressure
theoretically supports 33.9 ft of water column, friction losses, vapor pressure, and
NPSH requirements reduce practical suction lift to approximately 25 feet for
centrifugal pumps at sea level.
Question 6 A submersible pump differs from a turbine pump primarily because:
A. It operates at lower pressures
B. It requires a foot valve
C. It cannot pump sandy water
D. The motor is sealed and submerged with the pump
E. It uses a belt-drive system
, Correct Answer: D. The motor is sealed and submerged with the pump EXPERT
RATIONALE: In a submersible pump, the hermetically sealed motor is located
directly below the pump bowl assembly and operates submerged, eliminating long
drive shafts and reducing friction losses.
Question 7 Which pump type uses two intermeshing gears to move fluid?
A. Vane pump
B. Gear pump
C. Piston pump
D. Centrifugal pump
E. Jet pump
Correct Answer: B. Gear pump EXPERT RATIONALE: Gear pumps trap fluid
between gear teeth and the housing, carrying it around the outside of each gear to
the discharge port. They are positive displacement pumps commonly used for
viscous fluids.
Question 8 A jet pump uses which mechanism to lift water from a well?
A. A submerged impeller
B. A reciprocating diaphragm
C. A rotating turbine bowl
D. An ejector nozzle and venturi that creates a pressure differential
E. Magnetic induction
Correct Answer: D. An ejector nozzle and venturi that creates a pressure
differential EXPERT RATIONALE: Jet pumps force a high-velocity stream of water
through a venturi ejector, creating a low-pressure zone that draws water from the
well. The combined flow is then pressurized by the centrifugal stage above ground.
(TDLR Format) | Practice Questions with
Answers, Detailed Rationales &
Complete PDF Study Guide
TEXAS GENERAL PUMP INSTALLER EXAM 2026 (TDLR FORMAT)
Practice Questions with Answers & Detailed EXPERT RATIONALE
This practice guide mirrors the TDLR General Pump Installer licensing exam and
covers every tested domain to help you build confidence and pass on your first
attempt. Work through each question carefully, review every EXPERT RATIONALE —
even for questions you get right — and you will walk into the exam fully prepared.
SECTION 1: PUMP FUNDAMENTALS & CLASSIFICATIONS
Question 1 Which type of pump operates by trapping a fixed amount of fluid and
displacing it through the discharge?
A. Centrifugal pump
B. Axial flow pump
C. D. Positive displacement pump
D. Positive displacement pump
E. Mixed flow pump
Correct Answer: D. Positive displacement pump EXPERT RATIONALE: Positive
displacement pumps trap a fixed volume of fluid and force it through the outlet
with each cycle, making them ideal for high-pressure, low-flow applications
regardless of system pressure.
Question 2 A centrifugal pump moves fluid by which principle?
, A. Reciprocating pistons
B. Gear meshing action
C. Diaphragm flexing
D. Peristaltic squeezing
E. Centrifugal force from a rotating impeller
Correct Answer: E. Centrifugal force from a rotating impeller EXPERT
RATIONALE: Centrifugal pumps use a spinning impeller to impart velocity to fluid.
That velocity converts to pressure as fluid exits the volute casing, enabling
continuous flow.
Question 3 What term describes the total equivalent head a pump must overcome
in a system?
A. Static head only
B. Velocity head only
C. Total dynamic head (TDH)
D. Suction lift
E. Net positive suction head
Correct Answer: C. Total dynamic head (TDH) EXPERT RATIONALE: TDH is the
sum of static head, friction losses, and velocity head. It represents the complete
work a pump must perform and is used to select the correct pump for an
installation.
Question 4 Which pump classification is best suited for high-flow, low-pressure
agricultural irrigation systems?
A. Axial flow (propeller) pump
B. Reciprocating piston pump
, C. Gear pump
D. Diaphragm pump
E. Progressive cavity pump
Correct Answer: A. Axial flow (propeller) pump EXPERT RATIONALE: Axial flow
pumps move large volumes of water at low head by propelling fluid parallel to the
shaft axis, making them the standard choice for flood irrigation and drainage
applications.
Question 5 What is the maximum practical suction lift for a centrifugal pump at sea
level under normal conditions?
A. 5 feet
B. 10 feet
C. 20 feet
D. 25 feet
E. 33.9 feet
Correct Answer: D. 25 feet EXPERT RATIONALE: While atmospheric pressure
theoretically supports 33.9 ft of water column, friction losses, vapor pressure, and
NPSH requirements reduce practical suction lift to approximately 25 feet for
centrifugal pumps at sea level.
Question 6 A submersible pump differs from a turbine pump primarily because:
A. It operates at lower pressures
B. It requires a foot valve
C. It cannot pump sandy water
D. The motor is sealed and submerged with the pump
E. It uses a belt-drive system
, Correct Answer: D. The motor is sealed and submerged with the pump EXPERT
RATIONALE: In a submersible pump, the hermetically sealed motor is located
directly below the pump bowl assembly and operates submerged, eliminating long
drive shafts and reducing friction losses.
Question 7 Which pump type uses two intermeshing gears to move fluid?
A. Vane pump
B. Gear pump
C. Piston pump
D. Centrifugal pump
E. Jet pump
Correct Answer: B. Gear pump EXPERT RATIONALE: Gear pumps trap fluid
between gear teeth and the housing, carrying it around the outside of each gear to
the discharge port. They are positive displacement pumps commonly used for
viscous fluids.
Question 8 A jet pump uses which mechanism to lift water from a well?
A. A submerged impeller
B. A reciprocating diaphragm
C. A rotating turbine bowl
D. An ejector nozzle and venturi that creates a pressure differential
E. Magnetic induction
Correct Answer: D. An ejector nozzle and venturi that creates a pressure
differential EXPERT RATIONALE: Jet pumps force a high-velocity stream of water
through a venturi ejector, creating a low-pressure zone that draws water from the
well. The combined flow is then pressurized by the centrifugal stage above ground.
