2026/2027
CR 21 Landscape & Irrigation
AZROC Test Exam 2026/2027
Comprehensive Study Guide,
Practice Questions, Detailed
Explanations, and Exam Preparation
Manual
Question 1:
When transplanting a cactus, what should be done immediately after removing it from
the soil to reduce infection risk and promote survival?
A. Bind the roots with burlap
B. Do nothing
C. Dust the roots with powdered sulfur
D. Wash the roots with water
Correct Answer: C. Dust the roots with powdered sulfur
Rationale:
Dusting cactus roots with powdered sulfur helps prevent fungal and bacterial
infections by acting as a protective antiseptic barrier on exposed root surfaces. After
excavation, cactus roots are highly vulnerable to pathogens and desiccation. Sulfur
also helps dry out minor wounds, reducing rot risk. Washing the roots with water
increases moisture exposure, which promotes fungal growth. Burlap wrapping may
protect roots during transport but does not provide infection control. Doing nothing
exposes the plant to high risk of transplant failure.
Question 2:
When mowing turfgrass and leaving clippings on the lawn, what is the recommended
cutting rule to maintain healthy regrowth?
A. 1/3 blade length
B. 1/2 inch
C. 1/2 blade length
D. 1 inch
Correct Answer: A. 1/3 blade length
,2026/2027
Rationale:
The one-third rule is a standard turf management principle that prevents stress on
grass by ensuring no more than one-third of the blade is removed in a single mowing.
Cutting more than this reduces photosynthesis capacity and weakens the turf,
increasing susceptibility to disease and drought stress. Leaving clippings is beneficial
when properly cut because they decompose and return nutrients to the soil. Cutting
half or more of the blade length is considered excessive and harmful to turf health.
Question 3:
What is the required test pressure for solvent-cemented PVC pipe joints according to
standard irrigation construction practices?
A. 75 PSI
B. 100% of water pressure
C. 150% of water pressure
D. 100 PSI
Correct Answer: C. 150% of water pressure
Rationale:
Solvent-cemented PVC joints must be tested at 150% of operating water pressure to
ensure system integrity under stress conditions. This safety factor accounts for
pressure surges, water hammer effects, and long-term joint durability. Testing at
lower pressures may fail to detect leaks or weak joints. Standard operating pressure
alone is insufficient for certification-level testing, which requires overpressure
validation.
Question 4:
A pipeline system has a street pressure of 40 PSI and friction loss of 12 PSI. What is
the available pressure in feet of head?
A. 28 feet of head
B. 42 feet of head
C. 64.68 feet of head
D. 121.52 feet of head
Correct Answer: C. 64.68 feet of head
Rationale:
First, subtract friction loss from street pressure: 40 PSI − 12 PSI = 28 PSI. Convert
PSI to feet of head using the factor 2.31 (1 PSI = 2.31 ft head). Thus, 28 × 2.31 =
64.68 feet of head. This conversion is essential in irrigation design to evaluate system
performance in elevation-based pressure terms.
Question 5:
,2026/2027
How is slope percentage correctly determined in grading and construction work?
A. Horizontal plus vertical
B. Vertical divided by horizontal
C. Measure the width
D. Divide the area
Correct Answer: B. Vertical divided by horizontal
Rationale:
Slope percentage is calculated by dividing vertical rise by horizontal run, then
multiplying by 100 if expressed as a percentage. This ratio defines steepness in
grading, drainage, and construction planning. The other options do not accurately
represent slope geometry and cannot be used for engineering calculations.
Question 6:
What primarily determines the quality and flow efficiency of water inside a pipe
system?
A. Water hammer
B. Surge pressure
C. Pipe size
D. Water source
Correct Answer: C. Pipe size
Rationale:
Pipe diameter directly affects flow rate, velocity, and friction losses. Larger pipes
reduce resistance and allow higher flow capacity. While pressure surges and water
source affect system behavior, they do not define flow efficiency as fundamentally as
pipe size does.
Question 7:
What causes defects such as crazing, dusting, and spalling in finished concrete
surfaces?
A. Overworking the concrete surface
B. Not working the surface enough
C. Waiting too long before floating
D. Improper consolidation
Correct Answer: A. Overworking the concrete surface
Rationale:
Overworking concrete brings excess water and fines to the surface, weakening the top
layer. This results in surface defects such as dusting, scaling, and crazing. Proper
, 2026/2027
finishing techniques require controlled timing and minimal reworking once bleed
water disappears.
Question 8:
Which valve type is most appropriate when the main line is lower than the lateral
lines?
A. Globe valve
B. Gate valve
C. Angle valve
D. Hydro valve
Correct Answer: C. Angle valve
Rationale:
Angle valves are designed for systems where flow direction changes, particularly
when elevation differences exist between mains and laterals. They reduce pressure
loss and improve flow efficiency in such configurations. Gate and globe valves are
not optimized for directional elevation changes.
Question 9:
According to IRC standards, what is the maximum height of a single grout pour in a
masonry wall?
A. 2 feet
B. 4 feet
C. 6 feet
D. 8 feet
Correct Answer: D. 8 feet
Rationale:
The International Residential Code (IRC R606.3.5.1) allows grout pours up to 8 feet
in masonry construction to ensure proper consolidation and structural integrity.
Exceeding this height may result in voids or incomplete filling.
Question 10:
What is the life cycle duration of a biennial plant?
A. 2 years
B. 3 years
C. 4 years
D. 1 year
CR 21 Landscape & Irrigation
AZROC Test Exam 2026/2027
Comprehensive Study Guide,
Practice Questions, Detailed
Explanations, and Exam Preparation
Manual
Question 1:
When transplanting a cactus, what should be done immediately after removing it from
the soil to reduce infection risk and promote survival?
A. Bind the roots with burlap
B. Do nothing
C. Dust the roots with powdered sulfur
D. Wash the roots with water
Correct Answer: C. Dust the roots with powdered sulfur
Rationale:
Dusting cactus roots with powdered sulfur helps prevent fungal and bacterial
infections by acting as a protective antiseptic barrier on exposed root surfaces. After
excavation, cactus roots are highly vulnerable to pathogens and desiccation. Sulfur
also helps dry out minor wounds, reducing rot risk. Washing the roots with water
increases moisture exposure, which promotes fungal growth. Burlap wrapping may
protect roots during transport but does not provide infection control. Doing nothing
exposes the plant to high risk of transplant failure.
Question 2:
When mowing turfgrass and leaving clippings on the lawn, what is the recommended
cutting rule to maintain healthy regrowth?
A. 1/3 blade length
B. 1/2 inch
C. 1/2 blade length
D. 1 inch
Correct Answer: A. 1/3 blade length
,2026/2027
Rationale:
The one-third rule is a standard turf management principle that prevents stress on
grass by ensuring no more than one-third of the blade is removed in a single mowing.
Cutting more than this reduces photosynthesis capacity and weakens the turf,
increasing susceptibility to disease and drought stress. Leaving clippings is beneficial
when properly cut because they decompose and return nutrients to the soil. Cutting
half or more of the blade length is considered excessive and harmful to turf health.
Question 3:
What is the required test pressure for solvent-cemented PVC pipe joints according to
standard irrigation construction practices?
A. 75 PSI
B. 100% of water pressure
C. 150% of water pressure
D. 100 PSI
Correct Answer: C. 150% of water pressure
Rationale:
Solvent-cemented PVC joints must be tested at 150% of operating water pressure to
ensure system integrity under stress conditions. This safety factor accounts for
pressure surges, water hammer effects, and long-term joint durability. Testing at
lower pressures may fail to detect leaks or weak joints. Standard operating pressure
alone is insufficient for certification-level testing, which requires overpressure
validation.
Question 4:
A pipeline system has a street pressure of 40 PSI and friction loss of 12 PSI. What is
the available pressure in feet of head?
A. 28 feet of head
B. 42 feet of head
C. 64.68 feet of head
D. 121.52 feet of head
Correct Answer: C. 64.68 feet of head
Rationale:
First, subtract friction loss from street pressure: 40 PSI − 12 PSI = 28 PSI. Convert
PSI to feet of head using the factor 2.31 (1 PSI = 2.31 ft head). Thus, 28 × 2.31 =
64.68 feet of head. This conversion is essential in irrigation design to evaluate system
performance in elevation-based pressure terms.
Question 5:
,2026/2027
How is slope percentage correctly determined in grading and construction work?
A. Horizontal plus vertical
B. Vertical divided by horizontal
C. Measure the width
D. Divide the area
Correct Answer: B. Vertical divided by horizontal
Rationale:
Slope percentage is calculated by dividing vertical rise by horizontal run, then
multiplying by 100 if expressed as a percentage. This ratio defines steepness in
grading, drainage, and construction planning. The other options do not accurately
represent slope geometry and cannot be used for engineering calculations.
Question 6:
What primarily determines the quality and flow efficiency of water inside a pipe
system?
A. Water hammer
B. Surge pressure
C. Pipe size
D. Water source
Correct Answer: C. Pipe size
Rationale:
Pipe diameter directly affects flow rate, velocity, and friction losses. Larger pipes
reduce resistance and allow higher flow capacity. While pressure surges and water
source affect system behavior, they do not define flow efficiency as fundamentally as
pipe size does.
Question 7:
What causes defects such as crazing, dusting, and spalling in finished concrete
surfaces?
A. Overworking the concrete surface
B. Not working the surface enough
C. Waiting too long before floating
D. Improper consolidation
Correct Answer: A. Overworking the concrete surface
Rationale:
Overworking concrete brings excess water and fines to the surface, weakening the top
layer. This results in surface defects such as dusting, scaling, and crazing. Proper
, 2026/2027
finishing techniques require controlled timing and minimal reworking once bleed
water disappears.
Question 8:
Which valve type is most appropriate when the main line is lower than the lateral
lines?
A. Globe valve
B. Gate valve
C. Angle valve
D. Hydro valve
Correct Answer: C. Angle valve
Rationale:
Angle valves are designed for systems where flow direction changes, particularly
when elevation differences exist between mains and laterals. They reduce pressure
loss and improve flow efficiency in such configurations. Gate and globe valves are
not optimized for directional elevation changes.
Question 9:
According to IRC standards, what is the maximum height of a single grout pour in a
masonry wall?
A. 2 feet
B. 4 feet
C. 6 feet
D. 8 feet
Correct Answer: D. 8 feet
Rationale:
The International Residential Code (IRC R606.3.5.1) allows grout pours up to 8 feet
in masonry construction to ensure proper consolidation and structural integrity.
Exceeding this height may result in voids or incomplete filling.
Question 10:
What is the life cycle duration of a biennial plant?
A. 2 years
B. 3 years
C. 4 years
D. 1 year
