Real Texas General Pump Installer Practice Exam – Full Course 2026 Edition (TDLR– Approved Format | 300 Questions with Answers & Detailed Rationales) PDF

Real Texas General Pump Installer Practice
Exam – Full Course 2026 Edition (TDLR–
Approved Format | 300 Questions with Answers
& Detailed Rationales) PDF

Domain 1: Pump Types & Fundamental Operating Principles (Questions 1-
k k k k k k k k k


30)
k




1. Which type of pump is most commonly used for high-volume, low-
k k k k k k k k k k


kpressure applications? k


A. Positive displacement pump k k


B. Submersible pump k


C. Jet pump k


D. Centrifugal pump k


k Answer: D. Centrifugal k k


pump
k


Rationale: Centrifugal pumps are designed to handle high flow rates at
k k k k k k k k k k


kmoderate pressures by converting rotational kinetic energy into
k k k k k k k


khydrodynamic energy using an impeller. This makes them ideal fork k k k k k k k k


kapplications like irrigation and water transfer where volume is prioritized
k k k k k k k k k


kover high pressure .
k k k




2. What is the primary operating principle behind a centrifugal pump?
k k k k k k k k k


A. Fluid displacement by a piston
k k k k


B. Creation of a vacuum through the Venturi effect
k k k k k k k


C. Conversion of rotational energy into kinetic energy using centrifugal force
k k k k k k k k k


D. Compression of air to force water upward k k k k k k


Answer: C. Conversion of rotational energy into kinetic energy using
k k k k k k k k k


centrifugal force
k k


Rationale: A centrifugal pump uses a rotating impeller to impart velocity to
k k k k k k k k k k k


the fluid. The high-speed rotation creates centrifugal force, flinging the
k k k k k k k k k k


water outward, which is then converted into pressure energy in the volute
k k k k k k k k k k k k


casing .
k k

,3. Which type of pump is typically required for a deep well with a
k k k k k k k k k k k k


static water level of 300 feet?
k k k k k k


A. Shallow well jet pump k k k


B. Deep well jet pump k k k


C. Centrifugal pump k


D. Submersible pump k


kAnswer: D. Submersible k k


pump
k


*Rationale: Submersible pumps are installed below the water level and push
k k k k k k k k k k


water to the surface, making them highly efficient for deep wells
k k k k k k k k k k k


(exceeding 100 feet). Jet pumps, even deep-well models, struggle with
k k k k k k k k k k


suction lift beyond approximately 100-150 feet in practice .*
k k k k k k k k k




4. What is the function of the Venturi in a jet pump?
k k k k k k k k k k


A. To cool the motor
k k k


B. To create a low-pressure zone to draw water from the well
k k k k k k k k k k


C. To filter debris before it enters the impeller
k k k k k k k


D. To increase the electrical efficiency of the motor
k k k k k k k


Answer: B. To create a low-pressure zone to draw water from the well
k k k k k k k k k k k k


Rationale: In a jet pump, a portion of the water is recirculated through a
k k k k k k k k k k k k k k


nozzle and venturi. The nozzle accelerates water, and as it passes through
k k k k k k k k k k k k


the venturi, it creates a pressure drop (suction) that lifts water from the
k k k k k k k k k k k k k


well .
k k




5. A positive displacement pump is best suited for which scenario?
k k k k k k k k k


A. Transferring large volumes of water for irrigation k k k k k k


B. High-pressure, low-flow applications such as chemical injection k k k k k k


C. Pumping from a deep well with a 4-inch casingk k k k k k k k


D. Circulating water in a swimming pool k k k k k


Answer: B. High-pressure, low-flow applications such as chemical injection
k k k k k k k k


Rationale: Unlike centrifugal pumps, positive displacement pumps trap a
k k k k k k k k k


fixed amount of fluid and force it into the discharge pipe. This allows
k k k k k k k k k k k k k


them to maintain a consistent flow rate regardless of pressure, making
k k k k k k k k k k k


them ideal for precise applications like dosing chemicals or high-pressure
k k k k k k k k k k


cleaning .
k k

,6. What does the term "pump head" refer to?
k k k k k k k


A. The physical height of the pump assembly
k k k k k k


B. The diameter of the pump impeller
k k k k k


C. The total height a pump can raise water, measured in feet or meters
k k k k k k k k k k k k


D. The maximum current draw of the motor
k k k k k k


Answer: C. The total height a pump can raise water, measured in feet or
k k k k k k k k k k k k k


meters
k


Rationale: Head is a measure of the energy imparted to the fluid by the
k k k k k k k k k k k k k


pump. It represents the height of a water column that the pump can
k k k k k k k k k k k k k


overcome, accounting for vertical lift and friction losses .
k k k k k k k k k




7. What is the purpose of the volute casing in a centrifugal pump?
k k k k k k k k k k k


A. To house the electrical connections
k k k k


B. To direct fluid from the impeller to the discharge pipe while
k k k k k k k k k k


converting velocity into pressure
k k k k


C. To serve as a reservoir for pump lubricant
k k k k k k k


D. To prevent cavitation by cooling the impeller
k k k k k k


Answer: B. To direct fluid from the impeller to the discharge pipe while
k k k k k k k k k k k k


converting velocity into pressure
k k k k


Rationale: The volute is the spiral-shaped casing surrounding the impeller.
k k k k k k k k k


Its gradually increasing cross-sectional area slows down the fluid velocity,
k k k k k k k k k k


converting that kinetic energy into static pressure (head) before the water
k k k k k k k k k k k


exits the pump .
k k k k




8. If a centrifugal pump is operating far to the right of its Best
k k k k k k k k k k k k


Efficiency Point (BEP) on its curve, what is likely to happen?
k k k k k k k k k k k


A. Maximum efficiency and minimal vibration k k k k


B. Cavitation due to insufficient NPSH k k k k


C. High vibration, reduced efficiency, and potential motor overload
k k k k k k k


D. The pump will automatically shut down to prevent damage
k k k k k k k k


Answer: C. High vibration, reduced efficiency, and potential motor overload
k k k k k k k k k


Rationale: Operating a pump outside its BEP causes hydraulic imbalances. At
k k k k k k k k k k k


high flow rates (right of BEP), recirculation and turbulence occur, leading to
k k k k k k k k k k k k

, vibration, increased bearing wear, reduced efficiency, and higher power
k k k k k k k k


consumption, which can overload the motor .
k k k k k k k




9. What is the primary effect of increasing the diameter of the impeller on
k k k k k k k k k k k k


a centrifugal pump?
k k k


A. Flow rate decreases significantly
k k k


B. Both flow rate and head increase
k k k k k


C. Head decreases while efficiency increases
k k k k


D. The pump requires less horsepower
k k k k


Answer: B. Both flow rate and head
k k k k k k k


increase
k


Rationale: According to the pump affinity laws, increasing the impeller
k k k k k k k k k


diameter (at constant speed) increases both the flow rate (proportional to
k k k k k k k k k k k


the diameter) and the head (proportional to the square of the diameter).
k k k k k k k k k k k k


This is a common way to adjust pump performance .
k k k k k k k k k k




10. What does a pump performance curve show?
k k k k k k


A. The relationship between voltage and amperage draw
k k k k k k


B. The relationship between flow rate (Q) and head (H)
k k k k k k k k


C. The relationship between pump age and efficiency
k k k k k k


D. The relationship between water temperature and viscosity
k k k k k k


kAnswer: B. The relationship between flow rate (Q) and head
k k k k k k k k k


k(H)
Rationale: A pump curve is a graphical representation of a pump's ability to
k k k k k k k k k k k k


kgenerate head at various flow rates. It is the fundamental tool used to select
k k k k k k k k k k k k k


ka pump that meets the system's hydraulic requirements (Total Dynamic
k k k k k k k k k


kHead) at the desired flow rate .
k k k k k k




11. Which component in a pump system prevents the water from
k k k k k k k k k


kflowing backward when the pump stops?
k k k k k


A. Gate valve k


B. Pressure relief valve k k


C. Check valve k


D. Flow control valve k k


kAnswer: C. Check valve k k k


Rationale: Check valves are one-way valves. In a pumping system, they
k k k k k k k k k k