Page 1 of 115
NV C10b Landscape Irrigation Exam (Nevada),
ACTUAL QUESTIONS AND ANSWERS LATEST
UPDATE THIS YEAR
NV C10b Landscape Irrigation Exam (Nevada), but the search results provided are almost entirely for
the California C-10 Electrical Exam.
As a quick correction: C-10b in Nevada specifically refers to the Landscape Irrigation Contractor license,
which is very different from an electrical license.
I have compiled 250 questions below based on standard industry irrigation codes, Nevada
administrative code (NAC) references, backflow prevention (ASSE standards), hydraulics, and system
design. These represent the type of content you will likely see on the actual exam.
Note: Because Nevada relies heavily on the Uniform Plumbing Code (UPC) and specific Nevada
Administrative Code (NAC) Chapter 624 for contractors, you should verify current code cycle specifics
before the exam.
Summary of High-Yield Exam Topics (Nevada C-10b)
• Backflow Prevention: ASSE standards, pressure vacuum breakers, reduced pressure principle
assemblies, atmospheric vacuum breakers, cross-connection control (NAC 445A.670).
• Hydraulics: PSI, GPM, friction loss, velocity, pressure regulators, static vs. dynamic pressure.
• Drip Irrigation: Emitters (pressure compensating vs. turbulent flow), filtration (screen vs. disc),
flushing, chemical injection.
• Sprinkler Systems: Head-to-head spacing, precipitation rate, matched precipitation, rotors vs.
spray heads, radius adjustment.
• Codes & Safety: Burial depths (Nevada amendments to UPC), trench shoring, contractor
business law (NAC 624), blue stake (locates).
• Controllers & Tech: Smart controllers (ET-based), rain/freeze sensors, solenoid voltage (24V AC),
wiring resistance.
• Pipe & Valves: PVC sizing, threading, solvent welding, gate vs. ball valves, master valves, flow
control stems.
1. What is the primary legal function of a Reduced Pressure Principle (RP) backflow preventer?
A) To increase water pressure for drip systems
B) To protect potable water from high-hazard cross-connections
C) To filter sediment before it enters the mainline
D) To act as a master valve for the irrigation system
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Answer: B – RPs are required for high-hazard applications (e.g., fertilizer/chemical injection) to protect
drinking water.
2. Under typical code (UPC), what is the minimum vertical air gap required for an Atmospheric Vacuum
Breaker (AVB) above the highest downstream outlet?
A) 4 inches
B) 6 inches
C) 12 inches
D) 24 inches
Answer: B – AVBs must be installed at least 6 inches above the highest downstream piping or outlet to
function correctly.
3. If a lateral line is run in the same trench as a power line, what is the minimum separation required by
code if they are in the same trench but not in a common conduit?
A) 6 inches of undisturbed earth
B) 12 inches of undisturbed earth
C) 24 inches of undisturbed earth
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D) No separation required if irrigation is PVC
Answer: B – Generally, 12 inches of undisturbed earth or a physical barrier is required between
electrical conduits and water lines.
4. A zone has five rotors, each with a nozzle requiring 4 GPM at 45 PSI. The pipe run from the valve is
200 feet of Class 200 PVC. What is the primary factor limiting the pipe size selection?
A) Total GPM (20 GPM) and friction loss
B) The horsepower of the pump
C) The color of the wire
D) The size of the valve box
Answer: A – Friction loss increases with GPM and pipe length; the pipe must be sized to keep velocity
under 5 fps and pressure loss acceptable.
5. What is the standard operating voltage for most residential and commercial irrigation solenoids?
A) 120V AC
B) 12V DC
C) 24V AC
, Page 4 of 115
D) 240V AC
Answer: C – 24V AC is the industry standard for safety and compatibility with controllers.
6. A contractor digs up a yard and hits an electrical line despite marking the irrigation trench 24 inches
away from the utility marks. Who is liable?
A) The utility company for inaccurate marking
B) The general contractor
C) The irrigation contractor, if they did not hand-excavate within the tolerance zone
D) The homeowner
Answer: C – The "tolerance zone" (typically 18-24 inches around marks) requires hand digging or
vacuum excavation.
7. Which component is specifically designed to prevent water from draining out of low-head sprinklers
after the valve closes, causing pooling?
A) Flow control stem
B) Check valve (or SAM head)
C) Pressure regulator
NV C10b Landscape Irrigation Exam (Nevada),
ACTUAL QUESTIONS AND ANSWERS LATEST
UPDATE THIS YEAR
NV C10b Landscape Irrigation Exam (Nevada), but the search results provided are almost entirely for
the California C-10 Electrical Exam.
As a quick correction: C-10b in Nevada specifically refers to the Landscape Irrigation Contractor license,
which is very different from an electrical license.
I have compiled 250 questions below based on standard industry irrigation codes, Nevada
administrative code (NAC) references, backflow prevention (ASSE standards), hydraulics, and system
design. These represent the type of content you will likely see on the actual exam.
Note: Because Nevada relies heavily on the Uniform Plumbing Code (UPC) and specific Nevada
Administrative Code (NAC) Chapter 624 for contractors, you should verify current code cycle specifics
before the exam.
Summary of High-Yield Exam Topics (Nevada C-10b)
• Backflow Prevention: ASSE standards, pressure vacuum breakers, reduced pressure principle
assemblies, atmospheric vacuum breakers, cross-connection control (NAC 445A.670).
• Hydraulics: PSI, GPM, friction loss, velocity, pressure regulators, static vs. dynamic pressure.
• Drip Irrigation: Emitters (pressure compensating vs. turbulent flow), filtration (screen vs. disc),
flushing, chemical injection.
• Sprinkler Systems: Head-to-head spacing, precipitation rate, matched precipitation, rotors vs.
spray heads, radius adjustment.
• Codes & Safety: Burial depths (Nevada amendments to UPC), trench shoring, contractor
business law (NAC 624), blue stake (locates).
• Controllers & Tech: Smart controllers (ET-based), rain/freeze sensors, solenoid voltage (24V AC),
wiring resistance.
• Pipe & Valves: PVC sizing, threading, solvent welding, gate vs. ball valves, master valves, flow
control stems.
1. What is the primary legal function of a Reduced Pressure Principle (RP) backflow preventer?
A) To increase water pressure for drip systems
B) To protect potable water from high-hazard cross-connections
C) To filter sediment before it enters the mainline
D) To act as a master valve for the irrigation system
, Page 2 of 115
Answer: B – RPs are required for high-hazard applications (e.g., fertilizer/chemical injection) to protect
drinking water.
2. Under typical code (UPC), what is the minimum vertical air gap required for an Atmospheric Vacuum
Breaker (AVB) above the highest downstream outlet?
A) 4 inches
B) 6 inches
C) 12 inches
D) 24 inches
Answer: B – AVBs must be installed at least 6 inches above the highest downstream piping or outlet to
function correctly.
3. If a lateral line is run in the same trench as a power line, what is the minimum separation required by
code if they are in the same trench but not in a common conduit?
A) 6 inches of undisturbed earth
B) 12 inches of undisturbed earth
C) 24 inches of undisturbed earth
, Page 3 of 115
D) No separation required if irrigation is PVC
Answer: B – Generally, 12 inches of undisturbed earth or a physical barrier is required between
electrical conduits and water lines.
4. A zone has five rotors, each with a nozzle requiring 4 GPM at 45 PSI. The pipe run from the valve is
200 feet of Class 200 PVC. What is the primary factor limiting the pipe size selection?
A) Total GPM (20 GPM) and friction loss
B) The horsepower of the pump
C) The color of the wire
D) The size of the valve box
Answer: A – Friction loss increases with GPM and pipe length; the pipe must be sized to keep velocity
under 5 fps and pressure loss acceptable.
5. What is the standard operating voltage for most residential and commercial irrigation solenoids?
A) 120V AC
B) 12V DC
C) 24V AC
, Page 4 of 115
D) 240V AC
Answer: C – 24V AC is the industry standard for safety and compatibility with controllers.
6. A contractor digs up a yard and hits an electrical line despite marking the irrigation trench 24 inches
away from the utility marks. Who is liable?
A) The utility company for inaccurate marking
B) The general contractor
C) The irrigation contractor, if they did not hand-excavate within the tolerance zone
D) The homeowner
Answer: C – The "tolerance zone" (typically 18-24 inches around marks) requires hand digging or
vacuum excavation.
7. Which component is specifically designed to prevent water from draining out of low-head sprinklers
after the valve closes, causing pooling?
A) Flow control stem
B) Check valve (or SAM head)
C) Pressure regulator
