TEXAS IRRIGATION LICENSE EXAM LATEST REAL EXAM
100 QUESTIONS AND CORRECT ANSWERS|AGRADE
Field Capacity (FC) - ANSWER: The amount of water retained in soil after it has been
saturated and allowed to drain freely for two or three days. At field capacity, the
forces holding water to soil particles are approximately equal to the downward
forces of gravitational pull.
What is the name of the process where water is lost through the leaves? - ANSWER:
Transpiration
How does soil affect infiltration rate? - ANSWER: Hard, clay-laden soil will drain
poorly; Soft, sandy soil will drain quickly
4 main ways water is lost in the landscape? - ANSWER: Evaporation, transpiration,
deep percolation, run-off
How does soil affect water holding capacity? - ANSWER: Clay soil, has high holding
capacity due to lack of pore space; Sandy soil has low holding capacity due greater
pore space.
How does compaction affect water holding capacity? - ANSWER: Increases water
holding capacity and reduces infiltration rates
Slopes may require precipitation rates to be - ANSWER: decreased
One way to increase infiltration rates on slopes is to use repeated cycles - ANSWER:
True
How does soil type affect irrigation frequency? - ANSWER: Sandy - High drainage -
more watering
Clay - Low drainage - less watering
4 types of sprinklers - ANSWER: Spray
Flood
Micro-irrigation
Rotary
In which areas would you use the following sprinklers:
A. Rotary
B. Spray
C. Micro-Irrigation - ANSWER: A. Large Turf Areas
B. Small Lawns and Beds
C. Small planting areas - beds, shrubs, trees
Most efficient at delivering water to soil? - ANSWER: Micro-irrigation
, Most uniform distribution of water? - ANSWER: Spray head
Relative precipitation rates (Highest to lowest) - ANSWER: 1. Rotary
2. Spray
3. Micro-irrigation
Least expensive to irrigate a large turf area? - ANSWER: Rotary
Advantage of using a rain sensor? - ANSWER: It saves water and prevents over-
irrigation
Most irrigation controllers operate solenoid valves using - ANSWER: 24V
Two main types of sprinkler head spacings? - ANSWER: Square head spacing and
triangular head spacing
What are factors that affect head spacing? - ANSWER: It is wind, plant interference,
and equipment damage.
Distribution profiles for irrigation heads? - ANSWER: A. Square head spacing
B. Triangular head spacing
What is the effect of low pressure on the rotary head distribution profile? - ANSWER:
It results in a reduction in area coverage.
What is the difference between nominal and outside diameter pipes? - ANSWER:
Nominal: Not actual size, given in inches
Outside: Actual diameter, unless preceded by nominal
What is the relationship between schedule pipe size and thickness? - ANSWER:
Schedule number rises - pipe thickness increases
Two types of thermoplastic pipe? - ANSWER: A. PVC
B. PE
Identify following pipe markings:
1. 3 in
2. PVC1220
3. Sch40
4. 160psi
5. D2841
6. Tiger Plastic Co.
7. NSF - ANSWER: 1. Nominal pipe size
2. Type of plastic
3. Schedule (Pipe dim. ratio)
4. Pressure in lbs per square in.
100 QUESTIONS AND CORRECT ANSWERS|AGRADE
Field Capacity (FC) - ANSWER: The amount of water retained in soil after it has been
saturated and allowed to drain freely for two or three days. At field capacity, the
forces holding water to soil particles are approximately equal to the downward
forces of gravitational pull.
What is the name of the process where water is lost through the leaves? - ANSWER:
Transpiration
How does soil affect infiltration rate? - ANSWER: Hard, clay-laden soil will drain
poorly; Soft, sandy soil will drain quickly
4 main ways water is lost in the landscape? - ANSWER: Evaporation, transpiration,
deep percolation, run-off
How does soil affect water holding capacity? - ANSWER: Clay soil, has high holding
capacity due to lack of pore space; Sandy soil has low holding capacity due greater
pore space.
How does compaction affect water holding capacity? - ANSWER: Increases water
holding capacity and reduces infiltration rates
Slopes may require precipitation rates to be - ANSWER: decreased
One way to increase infiltration rates on slopes is to use repeated cycles - ANSWER:
True
How does soil type affect irrigation frequency? - ANSWER: Sandy - High drainage -
more watering
Clay - Low drainage - less watering
4 types of sprinklers - ANSWER: Spray
Flood
Micro-irrigation
Rotary
In which areas would you use the following sprinklers:
A. Rotary
B. Spray
C. Micro-Irrigation - ANSWER: A. Large Turf Areas
B. Small Lawns and Beds
C. Small planting areas - beds, shrubs, trees
Most efficient at delivering water to soil? - ANSWER: Micro-irrigation
, Most uniform distribution of water? - ANSWER: Spray head
Relative precipitation rates (Highest to lowest) - ANSWER: 1. Rotary
2. Spray
3. Micro-irrigation
Least expensive to irrigate a large turf area? - ANSWER: Rotary
Advantage of using a rain sensor? - ANSWER: It saves water and prevents over-
irrigation
Most irrigation controllers operate solenoid valves using - ANSWER: 24V
Two main types of sprinkler head spacings? - ANSWER: Square head spacing and
triangular head spacing
What are factors that affect head spacing? - ANSWER: It is wind, plant interference,
and equipment damage.
Distribution profiles for irrigation heads? - ANSWER: A. Square head spacing
B. Triangular head spacing
What is the effect of low pressure on the rotary head distribution profile? - ANSWER:
It results in a reduction in area coverage.
What is the difference between nominal and outside diameter pipes? - ANSWER:
Nominal: Not actual size, given in inches
Outside: Actual diameter, unless preceded by nominal
What is the relationship between schedule pipe size and thickness? - ANSWER:
Schedule number rises - pipe thickness increases
Two types of thermoplastic pipe? - ANSWER: A. PVC
B. PE
Identify following pipe markings:
1. 3 in
2. PVC1220
3. Sch40
4. 160psi
5. D2841
6. Tiger Plastic Co.
7. NSF - ANSWER: 1. Nominal pipe size
2. Type of plastic
3. Schedule (Pipe dim. ratio)
4. Pressure in lbs per square in.
