Texas (TX) General Pump Installer Practice Exam | Complete Study
Guide with Practice Questions, Answers & Rationales
1. According to the Texas Department of Licensing and
Regulation (TDLR) Occupations Code, how many feet of
horizontal separation must a licensed pump installer maintain
between an active water well head and a residential septic tank
system?
A) 10 feet
B) 25 feet
C) 50 feet
D) 100 feet
Rationale: TDLR rules under 16 Texas Administrative Code (T.A.C.) Chapter 76 state
that a water well must be located a minimum of 50 feet away from any septic tank or
non-perforated sewer line to prevent bacterial or pathogen contamination.
2. A licensed installer is setting a new 2-horsepower submersible
pump into a 300-foot well. To safely handle the continuous
mechanical torque and weight of the assembly, what is the
minimum required schedule rating for the plastic drop pipe?
A) Schedule 20 PVC
B) Schedule 80 PVC or Schedule 80 threaded drop pipe
C) Standard SDR 21 plastic tube
D) Class 160 thin-wall PVC
Rationale: Submersible pump installations at depths exceeding 200 feet or utilizing
motors over 1.5 HP require heavy-walled Schedule 80 PVC or high-performance
threaded steel drop pipes to safely withstand torque stress, high water pressure, and
tensile weight loads without snapping.
3. When troubleshooting a 230-volt single-phase water system
that keeps tripping the thermal overload switch inside the control
box, the pump installer measures the incoming voltage at 198
volts. How should this electrical parameter be interpreted?
A) The voltage is perfectly optimized for hot Texas summers
B) The voltage is below the standard ±10% utility tolerance limit, causing high
amperage draw and motor overheating
C) Low voltage decreases the amp draw, protecting the motor wires
D) The installer must double the size of the pressure switch spring
,Rationale: For a 230V motor, the acceptable ±10% voltage operating window is 207V to
253V. Dropping to 198V forces the motor to draw excess amperage to maintain its
torque demands, creating extreme thermal buildup that trips the overload safety circuit.
4. What is the fundamental operational focus of an "Air-Volume
Control" device mounted onto an un-lined galvanized
hydropneumatic pressure tank?
A) To bleed off all oxygen so anaerobic bacteria can multiply
B) To automatically maintain the correct structural air-to-water balance inside the
tank, preventing a waterlogged status
C) To increase line pressure up to an unregulated 200 PSI baseline
D) To filter out small fine sand grains before they enter home plumbing lines
Rationale: Un-lined galvanized tanks absorb air into the water matrix over time. Air-
volume control systems inject or vent air as the water level shifts, preserving the vital air
cushion to prevent a waterlogged tank and subsequent rapid pump cycling.
5. A pump installer is sealing a well casing slab after completing
a surface repair. According to TDLR well completion standards,
the top of the sanitary well casing must extend at least how many
inches above the final finished ground grade or surrounding
concrete pad?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
Rationale: 16 T.A.C. § 76.1000 requires the well casing to terminate at least 12 inches
above the high-water grade or finished concrete pad to prevent surface runoff water,
pests, and debris from entering the well head during downpours.
6. A installer is sizing a new residential pressure tank system.
The pump delivers a steady flow rate of 15 Gallons Per Minute
(GPM). If the manufacturer recommends a minimum pump
runtime of 1 minute to prevent motor fatigue, what is the required
drawdown volume of the pressure tank?
A) 5 gallons
B) 10 gallons
C) 15 gallons
D) 30 gallons
Rationale: Drawdown volume represents the actual amount of usable water discharged
from a pressure tank between the pump cut-out and cut-in cycles. To ensure a 1-minute
runtime for a 15 GPM pump, the tank's drawdown capacity must be at least 15 gallons.
,7. When wiring a 3-wire, single-phase submersible motor to its
corresponding control box, which wire color convention
represents the start winding line that must match the capacitor
circuit terminal?
A) Black
B) Yellow
C) Red
D) Green
Rationale: In standard water systems engineering (such as Franklin Electric
configurations), the Red wire feeds the start winding from the control box capacitor.
Black handles the main run winding, Yellow functions as the common line, and Green
serves as the system ground.
8. A property owner wants to install a water well 75 feet away
from a commercial cattle confinement pen. According to Texas
well-head safety regulations, how does this layout alter the
minimum installation requirements?
A) The layout is exempt from all codes as long as the well is deep
B) The distance is a violation; wells must be placed at least 150 feet away from
concentrated livestock feedlots, pens, or manure piles
C) The installer can proceed if they use an oil-lubricated turbine pump
D) The casing must be constructed out of transparent glass fibers
Rationale: Texas sanitary guidelines enforce an extended 150-foot horizontal setback
distance between public/private water wells and high-risk biological contamination
sources, such as animal feedlots, livestock pens, or un-lined manure storage pits.
9. Which structural plumbing component must be installed on the
discharge manifold line immediately before a hydropneumatic
pressure tank to prevent water from rushing backward into the
well when the pump shuts down?
A) Pressure relief valve
B) Check valve (or spring-loaded non-return valve)
C) Automatic air vent screen
D) Inline sediment strainer casing
Rationale: Check valves enforce one-way directional fluid dynamics. Placing a check
valve on the discharge line stops high-pressure water inside the pressure tank from
back-flowing into the well column, eliminating system pressure loss and line cavitation.
10. According to the National Electrical Code (NEC) regulations
for deep well pump installations, what is the maximum
, permissible percentage of voltage drop allowed along a long
subterranean wire run?
A) 1% drop
B) 3% drop
C) 5% drop (total combined system voltage drop)
D) 10% drop
Rationale: The NEC states that the total combined voltage drop on both the feeder and
branch circuits should not exceed 5% to ensure operational electrical efficiency and
protect submersible motors from low-voltage strain.
11. What is the technical definition of "Total Dynamic Head
(TDH)" when calculating the performance criteria for sizing a
centrifugal or submersible water pump?
A) The absolute height of the water tower divided by the motor horsepower
B) The sum of the total vertical lift distance plus the friction head loss caused by
pipes, valves, and fittings during active flow
C) The baseline pressure reading on the gauge when the pump sits completely idle
D) The volume of water remaining inside the well casing column
Rationale: TDH combines static head (vertical structural lift from the pumping water
level to the discharge point) and friction head (resistance created by water rushing
along internal pipe walls and fittings).
12. A pump installer notices that a well system is short-cycling—
turning on and off every 5 seconds whenever a home faucet is
opened. What diagnostic failure does this behavior point to?
A) The sub-mersible motor has developed a permanent dead short circuit
B) The pressure tank has become waterlogged, meaning it has lost its vital
structural air cushion
C) The system voltage is running 10% higher than utility specifications
D) The well water table has spontaneously risen to the surface pad
Rationale: Water is non-compressible. If a pressure tank loses its air cushion (becoming
waterlogged), the small volume of water entry instantly triggers the pressure switch to
hit its cut-out point, causing rapid, damaging pump cycling.
13. When installing a pitless adapter to connect a well line
horizontally below the frost line, what specific step must the
installer execute to protect the sanitary integrity of the well
casing cut?
A) Fill the adapter assembly with thick layers of organic packing grease
B) Utilize a gasket-sealed, water-tight pitless unit that clamps firmly to the casing,
ensuring an airtight mechanical seal
Guide with Practice Questions, Answers & Rationales
1. According to the Texas Department of Licensing and
Regulation (TDLR) Occupations Code, how many feet of
horizontal separation must a licensed pump installer maintain
between an active water well head and a residential septic tank
system?
A) 10 feet
B) 25 feet
C) 50 feet
D) 100 feet
Rationale: TDLR rules under 16 Texas Administrative Code (T.A.C.) Chapter 76 state
that a water well must be located a minimum of 50 feet away from any septic tank or
non-perforated sewer line to prevent bacterial or pathogen contamination.
2. A licensed installer is setting a new 2-horsepower submersible
pump into a 300-foot well. To safely handle the continuous
mechanical torque and weight of the assembly, what is the
minimum required schedule rating for the plastic drop pipe?
A) Schedule 20 PVC
B) Schedule 80 PVC or Schedule 80 threaded drop pipe
C) Standard SDR 21 plastic tube
D) Class 160 thin-wall PVC
Rationale: Submersible pump installations at depths exceeding 200 feet or utilizing
motors over 1.5 HP require heavy-walled Schedule 80 PVC or high-performance
threaded steel drop pipes to safely withstand torque stress, high water pressure, and
tensile weight loads without snapping.
3. When troubleshooting a 230-volt single-phase water system
that keeps tripping the thermal overload switch inside the control
box, the pump installer measures the incoming voltage at 198
volts. How should this electrical parameter be interpreted?
A) The voltage is perfectly optimized for hot Texas summers
B) The voltage is below the standard ±10% utility tolerance limit, causing high
amperage draw and motor overheating
C) Low voltage decreases the amp draw, protecting the motor wires
D) The installer must double the size of the pressure switch spring
,Rationale: For a 230V motor, the acceptable ±10% voltage operating window is 207V to
253V. Dropping to 198V forces the motor to draw excess amperage to maintain its
torque demands, creating extreme thermal buildup that trips the overload safety circuit.
4. What is the fundamental operational focus of an "Air-Volume
Control" device mounted onto an un-lined galvanized
hydropneumatic pressure tank?
A) To bleed off all oxygen so anaerobic bacteria can multiply
B) To automatically maintain the correct structural air-to-water balance inside the
tank, preventing a waterlogged status
C) To increase line pressure up to an unregulated 200 PSI baseline
D) To filter out small fine sand grains before they enter home plumbing lines
Rationale: Un-lined galvanized tanks absorb air into the water matrix over time. Air-
volume control systems inject or vent air as the water level shifts, preserving the vital air
cushion to prevent a waterlogged tank and subsequent rapid pump cycling.
5. A pump installer is sealing a well casing slab after completing
a surface repair. According to TDLR well completion standards,
the top of the sanitary well casing must extend at least how many
inches above the final finished ground grade or surrounding
concrete pad?
A) 6 inches
B) 12 inches
C) 18 inches
D) 24 inches
Rationale: 16 T.A.C. § 76.1000 requires the well casing to terminate at least 12 inches
above the high-water grade or finished concrete pad to prevent surface runoff water,
pests, and debris from entering the well head during downpours.
6. A installer is sizing a new residential pressure tank system.
The pump delivers a steady flow rate of 15 Gallons Per Minute
(GPM). If the manufacturer recommends a minimum pump
runtime of 1 minute to prevent motor fatigue, what is the required
drawdown volume of the pressure tank?
A) 5 gallons
B) 10 gallons
C) 15 gallons
D) 30 gallons
Rationale: Drawdown volume represents the actual amount of usable water discharged
from a pressure tank between the pump cut-out and cut-in cycles. To ensure a 1-minute
runtime for a 15 GPM pump, the tank's drawdown capacity must be at least 15 gallons.
,7. When wiring a 3-wire, single-phase submersible motor to its
corresponding control box, which wire color convention
represents the start winding line that must match the capacitor
circuit terminal?
A) Black
B) Yellow
C) Red
D) Green
Rationale: In standard water systems engineering (such as Franklin Electric
configurations), the Red wire feeds the start winding from the control box capacitor.
Black handles the main run winding, Yellow functions as the common line, and Green
serves as the system ground.
8. A property owner wants to install a water well 75 feet away
from a commercial cattle confinement pen. According to Texas
well-head safety regulations, how does this layout alter the
minimum installation requirements?
A) The layout is exempt from all codes as long as the well is deep
B) The distance is a violation; wells must be placed at least 150 feet away from
concentrated livestock feedlots, pens, or manure piles
C) The installer can proceed if they use an oil-lubricated turbine pump
D) The casing must be constructed out of transparent glass fibers
Rationale: Texas sanitary guidelines enforce an extended 150-foot horizontal setback
distance between public/private water wells and high-risk biological contamination
sources, such as animal feedlots, livestock pens, or un-lined manure storage pits.
9. Which structural plumbing component must be installed on the
discharge manifold line immediately before a hydropneumatic
pressure tank to prevent water from rushing backward into the
well when the pump shuts down?
A) Pressure relief valve
B) Check valve (or spring-loaded non-return valve)
C) Automatic air vent screen
D) Inline sediment strainer casing
Rationale: Check valves enforce one-way directional fluid dynamics. Placing a check
valve on the discharge line stops high-pressure water inside the pressure tank from
back-flowing into the well column, eliminating system pressure loss and line cavitation.
10. According to the National Electrical Code (NEC) regulations
for deep well pump installations, what is the maximum
, permissible percentage of voltage drop allowed along a long
subterranean wire run?
A) 1% drop
B) 3% drop
C) 5% drop (total combined system voltage drop)
D) 10% drop
Rationale: The NEC states that the total combined voltage drop on both the feeder and
branch circuits should not exceed 5% to ensure operational electrical efficiency and
protect submersible motors from low-voltage strain.
11. What is the technical definition of "Total Dynamic Head
(TDH)" when calculating the performance criteria for sizing a
centrifugal or submersible water pump?
A) The absolute height of the water tower divided by the motor horsepower
B) The sum of the total vertical lift distance plus the friction head loss caused by
pipes, valves, and fittings during active flow
C) The baseline pressure reading on the gauge when the pump sits completely idle
D) The volume of water remaining inside the well casing column
Rationale: TDH combines static head (vertical structural lift from the pumping water
level to the discharge point) and friction head (resistance created by water rushing
along internal pipe walls and fittings).
12. A pump installer notices that a well system is short-cycling—
turning on and off every 5 seconds whenever a home faucet is
opened. What diagnostic failure does this behavior point to?
A) The sub-mersible motor has developed a permanent dead short circuit
B) The pressure tank has become waterlogged, meaning it has lost its vital
structural air cushion
C) The system voltage is running 10% higher than utility specifications
D) The well water table has spontaneously risen to the surface pad
Rationale: Water is non-compressible. If a pressure tank loses its air cushion (becoming
waterlogged), the small volume of water entry instantly triggers the pressure switch to
hit its cut-out point, causing rapid, damaging pump cycling.
13. When installing a pitless adapter to connect a well line
horizontally below the frost line, what specific step must the
installer execute to protect the sanitary integrity of the well
casing cut?
A) Fill the adapter assembly with thick layers of organic packing grease
B) Utilize a gasket-sealed, water-tight pitless unit that clamps firmly to the casing,
ensuring an airtight mechanical seal
