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exas Landscape Irrigator License Actual Exam
T
2025 – Questions & Answers with Rationales |
100% Verified | TCEQ-Compliant | Graded A+
tudent Name:_________________________
S
Date:_______________
Time Limit:90 minutes
Total Questions:85
Instructions
● T his exam contains 85 questions, including multiple-choice (MCQs) and select-all-that-apply
(SATA), aligned with the 2025 TCEQ Landscape Irrigator licensing requirements (30 TAC
Chapter 344).
● Read each question carefully and select the best answer(s). For SATA questions, choose all
options that apply.
● Complete the exam within the 90-minute time limit.
● This exam tests knowledge in irrigation design principles, Texas Water Conservation Code,
controller programming and backflow prevention, site analysis, and estimating and
troubleshooting.
● A non-programmable calculator, pencil/pen, and scratch paper (provided by the proctor) are
permitted. No other materials are allowed.
Irrigation Design Principles (Questions 1–20)
1. W
hat is the primary purpose of a manifold in an irrigation system design?
A. Increase water pressure
B. Distribute water to multiple zones
C. Prevent backflow
, . Reduce friction loss
D
Answer:B. Distribute water to multiple zones
Rationale:A manifold distributes water from the mainline to multiple zones, allowing
independent control. It does not increase pressure, prevent backflow, or directly reduce friction
loss.
2. W
hat is the formula for calculating precipitation rate in inches per hour?
A. (96.3 × Total GPM) / Total Area
B. (Total GPM × 60) / Total Area
C. (Total Area × 96.3) / Total GPM
D. (Total GPM × 100) / Total Area
Answer:A. (96.3 × Total GPM) / Total Area
Rationale:The precipitation rate formula, (96.3 × Total GPM) / Total Area, calculates water
application in inches per hour. The constant 96.3 converts gallons per minute to inches per hour
over a given area.
3. W
hat is the maximum allowable velocity for water in PVC pipes to prevent water hammer?
A. 2 fps
B. 5 fps
C. 7 fps
D. 10 fps
Answer:B. 5 fps
Rationale:TCEQ recommends a maximum velocity of 5 feet per second (fps) in PVC pipes to
prevent water hammer and pipe damage.
4. S
elect All That Apply: Which components are critical for irrigation system hydraulics?
A. Mainline pipe
B. Sprinkler heads
C. Controller
D. Lateral pipes
E. Backflow preventer
Answer:A, B, D, E
Rationale:Mainline pipes, sprinkler heads, lateral pipes, and backflow preventers directly affect
water flow and pressure. Controllers manage timing but not hydraulics.
5. A
zone has seven spray heads, each using 2 GPM, on a 1-inch PVC pipe. What is the total
flow rate?
A. 7 GPM
B. 10 GPM
C. 14 GPM
D. 21 GPM
Answer:C. 14 GPM
Rationale:Seven spray heads at 2 GPM each result in 7 × 2 = 14 GPM total flow rate.
, 6. W
hat is the purpose of an air relief valve in a drip irrigation system?
A. Regulate pressure
B. Prevent vacuum and debris entry
C. Increase flow rate
D. Control zone timing
Answer:B. Prevent vacuum and debris entry
Rationale:Air relief valves allow air into drip lines when the system is off, preventing
vacuum-induced debris or contaminant entry.
7. W
hat is the minimum spacing for rotary sprinkler heads to ensure uniform coverage?
A. 10–15 feet
B. 15–20 feet
C. 20–30 feet
D. 30–40 feet
Answer:D. 30–40 feet
Rationale:Rotary sprinkler heads typically require 30–40 feet spacing for uniform coverage,
depending on the model and pressure.
8. W
hat is the effect of friction loss in irrigation system design?
A. Increases water pressure
B. Reduces water pressure
C. Increases flow rate
D. Reduces pipe diameter
Answer:B. Reduces water pressure
Rationale:Friction loss occurs as water flows through pipes and fittings, reducing available
pressure.
9. A
system has a static pressure of 60 psi and a total pressure loss of 15 psi. What is the actual
head pressure?
A. 45 psi
B. 50 psi
C. 55 psi
D. 75 psi
Answer:A. 45 psi
Rationale:Actual head pressure = Static pressure − Total pressure loss = 60 psi − 15 psi = 45 psi.
10.What is the purpose of looped mains in an irrigation system?
A. Reduce installation cost
B. Improve pressure uniformity
C. Prevent backflow
D. Simplify controller programming
Answer:B. Improve pressure uniformity
Rationale:Looped mains provide multiple water paths, reducing pressure loss and improving
exas Landscape Irrigator License Actual Exam
T
2025 – Questions & Answers with Rationales |
100% Verified | TCEQ-Compliant | Graded A+
tudent Name:_________________________
S
Date:_______________
Time Limit:90 minutes
Total Questions:85
Instructions
● T his exam contains 85 questions, including multiple-choice (MCQs) and select-all-that-apply
(SATA), aligned with the 2025 TCEQ Landscape Irrigator licensing requirements (30 TAC
Chapter 344).
● Read each question carefully and select the best answer(s). For SATA questions, choose all
options that apply.
● Complete the exam within the 90-minute time limit.
● This exam tests knowledge in irrigation design principles, Texas Water Conservation Code,
controller programming and backflow prevention, site analysis, and estimating and
troubleshooting.
● A non-programmable calculator, pencil/pen, and scratch paper (provided by the proctor) are
permitted. No other materials are allowed.
Irrigation Design Principles (Questions 1–20)
1. W
hat is the primary purpose of a manifold in an irrigation system design?
A. Increase water pressure
B. Distribute water to multiple zones
C. Prevent backflow
, . Reduce friction loss
D
Answer:B. Distribute water to multiple zones
Rationale:A manifold distributes water from the mainline to multiple zones, allowing
independent control. It does not increase pressure, prevent backflow, or directly reduce friction
loss.
2. W
hat is the formula for calculating precipitation rate in inches per hour?
A. (96.3 × Total GPM) / Total Area
B. (Total GPM × 60) / Total Area
C. (Total Area × 96.3) / Total GPM
D. (Total GPM × 100) / Total Area
Answer:A. (96.3 × Total GPM) / Total Area
Rationale:The precipitation rate formula, (96.3 × Total GPM) / Total Area, calculates water
application in inches per hour. The constant 96.3 converts gallons per minute to inches per hour
over a given area.
3. W
hat is the maximum allowable velocity for water in PVC pipes to prevent water hammer?
A. 2 fps
B. 5 fps
C. 7 fps
D. 10 fps
Answer:B. 5 fps
Rationale:TCEQ recommends a maximum velocity of 5 feet per second (fps) in PVC pipes to
prevent water hammer and pipe damage.
4. S
elect All That Apply: Which components are critical for irrigation system hydraulics?
A. Mainline pipe
B. Sprinkler heads
C. Controller
D. Lateral pipes
E. Backflow preventer
Answer:A, B, D, E
Rationale:Mainline pipes, sprinkler heads, lateral pipes, and backflow preventers directly affect
water flow and pressure. Controllers manage timing but not hydraulics.
5. A
zone has seven spray heads, each using 2 GPM, on a 1-inch PVC pipe. What is the total
flow rate?
A. 7 GPM
B. 10 GPM
C. 14 GPM
D. 21 GPM
Answer:C. 14 GPM
Rationale:Seven spray heads at 2 GPM each result in 7 × 2 = 14 GPM total flow rate.
, 6. W
hat is the purpose of an air relief valve in a drip irrigation system?
A. Regulate pressure
B. Prevent vacuum and debris entry
C. Increase flow rate
D. Control zone timing
Answer:B. Prevent vacuum and debris entry
Rationale:Air relief valves allow air into drip lines when the system is off, preventing
vacuum-induced debris or contaminant entry.
7. W
hat is the minimum spacing for rotary sprinkler heads to ensure uniform coverage?
A. 10–15 feet
B. 15–20 feet
C. 20–30 feet
D. 30–40 feet
Answer:D. 30–40 feet
Rationale:Rotary sprinkler heads typically require 30–40 feet spacing for uniform coverage,
depending on the model and pressure.
8. W
hat is the effect of friction loss in irrigation system design?
A. Increases water pressure
B. Reduces water pressure
C. Increases flow rate
D. Reduces pipe diameter
Answer:B. Reduces water pressure
Rationale:Friction loss occurs as water flows through pipes and fittings, reducing available
pressure.
9. A
system has a static pressure of 60 psi and a total pressure loss of 15 psi. What is the actual
head pressure?
A. 45 psi
B. 50 psi
C. 55 psi
D. 75 psi
Answer:A. 45 psi
Rationale:Actual head pressure = Static pressure − Total pressure loss = 60 psi − 15 psi = 45 psi.
10.What is the purpose of looped mains in an irrigation system?
A. Reduce installation cost
B. Improve pressure uniformity
C. Prevent backflow
D. Simplify controller programming
Answer:B. Improve pressure uniformity
Rationale:Looped mains provide multiple water paths, reducing pressure loss and improving
