Texas Irrigation Technician Examination
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026/2027 Q&A |
Instant Download Pdf
1. Which of the following is the most efficient irrigation method for
minimizing water loss due to evaporation?
A. Overhead sprinklers
B. Drip irrigation
C. Flood irrigation
D. Center pivot
Drip irrigation delivers water directly to the root zone, minimizing evaporation
and runoff, making it the most efficient method.
2. What is the primary purpose of a backflow preventer in an irrigation
system?
A. Increase water pressure
B. Filter debris from water
C. Prevent contamination of the potable water supply
D. Reduce water flow
Backflow preventers protect the public water supply by preventing
contaminated water from flowing back into the main system.
3. Which type of valve is commonly used for automatic irrigation systems?
A. Ball valve
B. Gate valve
C. Solenoid valve
D. Butterfly valve
Solenoid valves are electrically controlled and can be operated automatically by
a controller for irrigation scheduling.
,4. Which soil type has the highest water-holding capacity?
A. Sand
B. Clay
C. Silt
D. Gravel
Clay soils have very fine particles that retain water well, giving them a high
water-holding capacity compared to sand or gravel.
5. What is the standard spacing of spray heads for an area irrigated with
spray irrigation?
A. Twice the spray radius
B. Half the spray radius
C. Equal to the spray radius
D. One-quarter the spray radius
Spray heads should be spaced approximately equal to their radius to ensure
uniform water coverage and avoid dry spots.
6. What is the main reason to perform a “catch-can test”?
A. Check soil infiltration rate
B. Test water pressure
C. Measure uniformity of sprinkler coverage
D. Identify leaks in the main line
A catch-can test evaluates how evenly sprinklers distribute water over a zone,
which is critical for system efficiency.
7. What is the maximum allowable static water pressure for most residential
irrigation systems?
A. 20 psi
B. 30 psi
C. 50 psi
D. 70 psi
Residential irrigation systems are typically designed for pressures around 40–50
psi to prevent damage to components and ensure proper operation.
, 8. Which component reduces water pressure in an irrigation system?
A. Check valve
B. Filter
C. Pressure regulator
D. Solenoid valve
Pressure regulators ensure that sprinklers receive the correct pressure,
preventing misting or damage to the system.
9. Which type of sprinkler is most appropriate for small, irregularly shaped
lawns?
A. Center pivot
B. Rotor
C. Fixed spray head
D. Drip emitter
Fixed spray heads are ideal for small or irregularly shaped areas because they
can be placed precisely and irrigate uniformly.
10. When installing a lateral line, what should be the minimum depth below
grade to prevent damage from mowing?
A. 2 inches
B. 4 inches
C. 6 inches
D. 12 inches
Lateral lines should be buried about 12 inches deep to protect against
mechanical damage and normal surface activity.
11. Which water source is most susceptible to contamination and usually
requires filtration?
A. Municipal water
B. Surface water (ponds, lakes)
C. Well water
D. Rainwater stored in tanks
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026/2027 Q&A |
Instant Download Pdf
1. Which of the following is the most efficient irrigation method for
minimizing water loss due to evaporation?
A. Overhead sprinklers
B. Drip irrigation
C. Flood irrigation
D. Center pivot
Drip irrigation delivers water directly to the root zone, minimizing evaporation
and runoff, making it the most efficient method.
2. What is the primary purpose of a backflow preventer in an irrigation
system?
A. Increase water pressure
B. Filter debris from water
C. Prevent contamination of the potable water supply
D. Reduce water flow
Backflow preventers protect the public water supply by preventing
contaminated water from flowing back into the main system.
3. Which type of valve is commonly used for automatic irrigation systems?
A. Ball valve
B. Gate valve
C. Solenoid valve
D. Butterfly valve
Solenoid valves are electrically controlled and can be operated automatically by
a controller for irrigation scheduling.
,4. Which soil type has the highest water-holding capacity?
A. Sand
B. Clay
C. Silt
D. Gravel
Clay soils have very fine particles that retain water well, giving them a high
water-holding capacity compared to sand or gravel.
5. What is the standard spacing of spray heads for an area irrigated with
spray irrigation?
A. Twice the spray radius
B. Half the spray radius
C. Equal to the spray radius
D. One-quarter the spray radius
Spray heads should be spaced approximately equal to their radius to ensure
uniform water coverage and avoid dry spots.
6. What is the main reason to perform a “catch-can test”?
A. Check soil infiltration rate
B. Test water pressure
C. Measure uniformity of sprinkler coverage
D. Identify leaks in the main line
A catch-can test evaluates how evenly sprinklers distribute water over a zone,
which is critical for system efficiency.
7. What is the maximum allowable static water pressure for most residential
irrigation systems?
A. 20 psi
B. 30 psi
C. 50 psi
D. 70 psi
Residential irrigation systems are typically designed for pressures around 40–50
psi to prevent damage to components and ensure proper operation.
, 8. Which component reduces water pressure in an irrigation system?
A. Check valve
B. Filter
C. Pressure regulator
D. Solenoid valve
Pressure regulators ensure that sprinklers receive the correct pressure,
preventing misting or damage to the system.
9. Which type of sprinkler is most appropriate for small, irregularly shaped
lawns?
A. Center pivot
B. Rotor
C. Fixed spray head
D. Drip emitter
Fixed spray heads are ideal for small or irregularly shaped areas because they
can be placed precisely and irrigate uniformly.
10. When installing a lateral line, what should be the minimum depth below
grade to prevent damage from mowing?
A. 2 inches
B. 4 inches
C. 6 inches
D. 12 inches
Lateral lines should be buried about 12 inches deep to protect against
mechanical damage and normal surface activity.
11. Which water source is most susceptible to contamination and usually
requires filtration?
A. Municipal water
B. Surface water (ponds, lakes)
C. Well water
D. Rainwater stored in tanks
