CR-21 Landscapes and Irrigation AZROC
EXAM STUDY GUIDE 2026/2027
ACCURATE QUESTIONS WITH CORRECT
DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. What is the minimum thickness of brick for the exterior wall of a fireplace?
a) 6 inches
b) 8 inches
c) 10 inches
d) 9 inches - ANSWER ✔ 8 Inches
2. What is 1/2 inch of accumulated organic material in a grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer - ANSWER ✔ Thatch Layer
3. What should be provided as a cover for the drain tile before installing the
pond liner where subdrain is used?
a) 4 inches of pea gravel
b) screen with 1/4 inch mesh
c) a pool grate
d) 8 inches of medium sized rock - ANSWER ✔ 4 inches of pea gravel
4. How do you properly plant ground cover?
a) in a circular pattern
b) in rows, each row staggered
, c) in groups of 2
d) 18 inches apart in rows - ANSWER ✔ In rows, each row staggered
5. You are going to pour a concrete pad that is 16 feet by 22 feet and 4 inches
thick, how many cubic yards of concrete are needed?
a) 7.3
b) 6.3
c) 3.3
d) 4.3 - ANSWER ✔ 4.3 cubic yard
4.3 cubic yards
4inches ---> 0.333ft
Cubic feet to cubic yards /27
16*22*0.333=117.3333
117.3333/27 = 4.3 cubic yards
You use cap or paving blocks to give a wall a finished look. These are thin,
flat blocks that cap a wall and keep rain from entering the wall cavities
6. When should a cactus be watered after transplant?
A. immediately
B. 3 to 4 weeks
C. within a week
D. 2 weeks - ANSWER ✔ B. 3 to 4 weeks
7. When installing an electrical (irrigation) pump, a circuit breaker (disconnect)
must be installed within _____ feet of the pump.
A. 50
B. 15
C. 12
D. 10 - ANSWER ✔ A. 50
B) Main Disconnecting Means The main disconnecting means for the
machine shall provide overcurrent protection, shall be at the point of
connection of electrical power to the machine or shall be visible and not
more than 15 m (50 ft) from the machine, and shall be readily accessible and
capable of being locked in the open position. This disconnecting means shall
, have a horsepower and current rating not less than required for the main
controller.
8. Which of the following causes of water hammer is NOT of concern in a
typical irrigation system that uses a well as a water source?
A. valve closure
B. trapped air in long pipe runs
C. reverse flow when the pump stops
D. uncontrolled flow velocity in empty pipes - ANSWER ✔ B.
trapped air in long pipe runs
9. There are four causes of water hammer which may be encountered in
irrigation systems. 1. Valve closure 2. Uncontrolled flow velocity in empty
pipes 3. Trapped air in long runs of pipe 4. Reverse flow when pumps stop
The first two causes may be encountered in any type system. The third cause
generally occurs only in long runs of pipe such as systems for irrigating golf
courses. The last cause is of concern with private pump supplies only.
10.Pressure regulator - ANSWER ✔ A component of an irrigation system
responsible for reducing the water pressure to a safe level for irrigation
components.
11.Backflow preventer - ANSWER ✔ A device in an irrigation system that
prevents contaminated water from flowing back into the potable water
supply.
12.Drip irrigation - ANSWER ✔ An irrigation method that delivers water
directly to the roots of plants, minimizing evaporation and water loss,
making it highly efficient in arid climates.
13.Solenoid valve - ANSWER ✔ A device in an irrigation system that opens
and closes water flow electronically, controlled by the irrigation controller.
14.Precipitation rate - ANSWER ✔ The speed at which water is applied to an
area in irrigation systems, indicating how much water is applied over a given
area in a specific period.
, 15.Micro-sprinklers - ANSWER ✔ Irrigation sprinklers that are ideal for
irregularly shaped landscapes, allowing targeted water application with
flexible coverage patterns.
16.Soil type - ANSWER ✔ A critical factor when designing an irrigation
system, influencing water infiltration and retention.
17.Rain sensor - ANSWER ✔ It shuts off the system during rainfall.
18.PVC (Polyvinyl Chloride) - ANSWER ✔ PVC is durable, lightweight, and
resistant to corrosion, making it the preferred material for residential
irrigation pipelines.
19.Zone valve - ANSWER ✔ To divide the system into manageable areas.
20.Irrigation scheduling factors - ANSWER ✔ Weather conditions and soil
moisture levels.
21.Ideal water pressure for drip irrigation - ANSWER ✔ 10-20 psi.
22.Head-to-head coverage - ANSWER ✔ Overlapping sprinkler coverage for
uniform watering.
23.Drip emitter - ANSWER ✔ To release water slowly to the base of plants.
24.Issue caused by overwatering - ANSWER ✔ Increased pest activity.
25.Irrigation Controller - ANSWER ✔ To program and automate watering
schedules.
26.Clay Soil - ANSWER ✔ Requires shorter, more frequent irrigation cycles
to prevent water runoff.
27.Smart Irrigation System - ANSWER ✔ Increased water efficiency and
conservation.
28.Polyethylene Tubing - ANSWER ✔ Flexibility and ease of installation.
EXAM STUDY GUIDE 2026/2027
ACCURATE QUESTIONS WITH CORRECT
DETAILED SOLUTIONS ||
100% GUARANTEED PASS
<NEWEST VERSION>
1. What is the minimum thickness of brick for the exterior wall of a fireplace?
a) 6 inches
b) 8 inches
c) 10 inches
d) 9 inches - ANSWER ✔ 8 Inches
2. What is 1/2 inch of accumulated organic material in a grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer - ANSWER ✔ Thatch Layer
3. What should be provided as a cover for the drain tile before installing the
pond liner where subdrain is used?
a) 4 inches of pea gravel
b) screen with 1/4 inch mesh
c) a pool grate
d) 8 inches of medium sized rock - ANSWER ✔ 4 inches of pea gravel
4. How do you properly plant ground cover?
a) in a circular pattern
b) in rows, each row staggered
, c) in groups of 2
d) 18 inches apart in rows - ANSWER ✔ In rows, each row staggered
5. You are going to pour a concrete pad that is 16 feet by 22 feet and 4 inches
thick, how many cubic yards of concrete are needed?
a) 7.3
b) 6.3
c) 3.3
d) 4.3 - ANSWER ✔ 4.3 cubic yard
4.3 cubic yards
4inches ---> 0.333ft
Cubic feet to cubic yards /27
16*22*0.333=117.3333
117.3333/27 = 4.3 cubic yards
You use cap or paving blocks to give a wall a finished look. These are thin,
flat blocks that cap a wall and keep rain from entering the wall cavities
6. When should a cactus be watered after transplant?
A. immediately
B. 3 to 4 weeks
C. within a week
D. 2 weeks - ANSWER ✔ B. 3 to 4 weeks
7. When installing an electrical (irrigation) pump, a circuit breaker (disconnect)
must be installed within _____ feet of the pump.
A. 50
B. 15
C. 12
D. 10 - ANSWER ✔ A. 50
B) Main Disconnecting Means The main disconnecting means for the
machine shall provide overcurrent protection, shall be at the point of
connection of electrical power to the machine or shall be visible and not
more than 15 m (50 ft) from the machine, and shall be readily accessible and
capable of being locked in the open position. This disconnecting means shall
, have a horsepower and current rating not less than required for the main
controller.
8. Which of the following causes of water hammer is NOT of concern in a
typical irrigation system that uses a well as a water source?
A. valve closure
B. trapped air in long pipe runs
C. reverse flow when the pump stops
D. uncontrolled flow velocity in empty pipes - ANSWER ✔ B.
trapped air in long pipe runs
9. There are four causes of water hammer which may be encountered in
irrigation systems. 1. Valve closure 2. Uncontrolled flow velocity in empty
pipes 3. Trapped air in long runs of pipe 4. Reverse flow when pumps stop
The first two causes may be encountered in any type system. The third cause
generally occurs only in long runs of pipe such as systems for irrigating golf
courses. The last cause is of concern with private pump supplies only.
10.Pressure regulator - ANSWER ✔ A component of an irrigation system
responsible for reducing the water pressure to a safe level for irrigation
components.
11.Backflow preventer - ANSWER ✔ A device in an irrigation system that
prevents contaminated water from flowing back into the potable water
supply.
12.Drip irrigation - ANSWER ✔ An irrigation method that delivers water
directly to the roots of plants, minimizing evaporation and water loss,
making it highly efficient in arid climates.
13.Solenoid valve - ANSWER ✔ A device in an irrigation system that opens
and closes water flow electronically, controlled by the irrigation controller.
14.Precipitation rate - ANSWER ✔ The speed at which water is applied to an
area in irrigation systems, indicating how much water is applied over a given
area in a specific period.
, 15.Micro-sprinklers - ANSWER ✔ Irrigation sprinklers that are ideal for
irregularly shaped landscapes, allowing targeted water application with
flexible coverage patterns.
16.Soil type - ANSWER ✔ A critical factor when designing an irrigation
system, influencing water infiltration and retention.
17.Rain sensor - ANSWER ✔ It shuts off the system during rainfall.
18.PVC (Polyvinyl Chloride) - ANSWER ✔ PVC is durable, lightweight, and
resistant to corrosion, making it the preferred material for residential
irrigation pipelines.
19.Zone valve - ANSWER ✔ To divide the system into manageable areas.
20.Irrigation scheduling factors - ANSWER ✔ Weather conditions and soil
moisture levels.
21.Ideal water pressure for drip irrigation - ANSWER ✔ 10-20 psi.
22.Head-to-head coverage - ANSWER ✔ Overlapping sprinkler coverage for
uniform watering.
23.Drip emitter - ANSWER ✔ To release water slowly to the base of plants.
24.Issue caused by overwatering - ANSWER ✔ Increased pest activity.
25.Irrigation Controller - ANSWER ✔ To program and automate watering
schedules.
26.Clay Soil - ANSWER ✔ Requires shorter, more frequent irrigation cycles
to prevent water runoff.
27.Smart Irrigation System - ANSWER ✔ Increased water efficiency and
conservation.
28.Polyethylene Tubing - ANSWER ✔ Flexibility and ease of installation.
