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North Carolina Irrigation Contractor Exam Level II
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
North Carolina Irrigation Contractor Exam — Level II — Summarized Coverage
The North Carolina Irrigation Contractor Level II Examination is a higher-level licensing exam
administered by the North Carolina Irrigation Contractors’ Licensing Board. It evaluates advanced
competency in irrigation system design, hydraulic calculations, water efficiency engineering,
installation standards, system troubleshooting, and contractor-level business and compliance
responsibilities. Level II places greater emphasis on design accuracy, pump sizing, pressure
management, and complex system evaluation compared to Level I.
Irrigation System Design & Engineering Principles
• Advanced irrigation layout design for commercial and large landscapes
• Zone balancing and hydraulic zoning strategies
• Head-to-head coverage design optimization
• Spray, rotor, drip, and specialty irrigation system integration
• Distribution uniformity and efficiency design principles
• System scalability for golf courses, parks, and large properties
Hydraulic Calculations & Water Flow
• Flow rate (GPM) calculations and system demand analysis
• Pressure loss and friction loss calculations in pipelines
• Pipe sizing based on velocity and flow requirements
• Static, dynamic, and residual pressure concepts
• Elevation and pressure variation adjustments
• Total dynamic head (TDH) calculations for pump systems
• Pump selection based on system demand
Pumping Systems & Water Supply
• Pump types (centrifugal, booster, submersible)
• Pump performance curves and interpretation
• Pump efficiency and horsepower selection
• Water source evaluation (well, municipal, surface water)
• Pump station design and installation basics
• Backflow prevention integration with pumping systems
Advanced Irrigation Components
• Valves, manifold systems, and zone control systems
• Solenoid valve troubleshooting and replacement
• Pressure regulation and flow control devices
• Filters for drip and micro-irrigation systems
• Sensors (rain, moisture, freeze, wind) and automation systems
• Smart irrigation controller integration and programming
System Installation & Construction Standards
• Deep trenching and large-scale pipe installation practices
• PVC, HDPE, and commercial-grade piping systems
• Jointing methods and leak prevention techniques
• Valve box installation and system accessibility standards
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• Pressure testing procedures for installed systems
• Large-scale system commissioning and start-up procedures
Soil, Plant, and Water Interaction
• Advanced evapotranspiration (ET) scheduling principles
• Soil infiltration rate and water-holding capacity analysis
• Root zone depth and plant water demand modeling
• Turfgrass and landscape water requirement optimization
• Seasonal irrigation scheduling adjustments
Irrigation Troubleshooting & Diagnostics
• Diagnosing pressure loss in complex systems
• Uneven coverage correction strategies
• Pump failure and cavitation diagnosis
• Electrical valve and controller fault detection
• Leak detection in underground piping systems
• System performance auditing and efficiency correction
Electrical & Control Systems
• Advanced controller programming (multi-zone systems)
• Wiring diagrams for large irrigation systems
• Solenoid operation and electrical troubleshooting
• Sensor integration (ET controllers, soil probes, weather stations)
• Low-voltage system safety and diagnostics
Water Efficiency & Conservation Engineering
• Advanced water conservation design strategies
• Minimizing runoff and deep percolation losses
• Efficiency audits and system performance optimization
• Xeriscaping integration with irrigation design
• Pressure regulation for conservation compliance
Regulatory Compliance & Standards
• NC irrigation contractor licensing law compliance
• Backflow prevention requirements and inspection standards
• Environmental protection and groundwater safety
• Local irrigation codes and installation regulations
• Recordkeeping and inspection documentation requirements
Business, Project & Contractor Management
• Advanced job estimating and project bidding
• Material takeoffs and cost forecasting
• Labor productivity and project scheduling
• Contract documentation and scope of work definitions
• Profitability analysis and business decision-making
Scenario-Based Applications (High Priority)
• Designing full commercial irrigation systems from site plans
• Correcting hydraulic imbalance in multi-zone systems
• Selecting and sizing pumps for large irrigation projects
• Fixing pressure and flow inefficiencies in field systems
• Diagnosing controller, valve, and pump system failures
• Ensuring compliance with NC irrigation regulations and water efficiency standards
North Carolina Irrigation Contractor Exam — Level II
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MCQ Practice Set 1 (Questions 1–50)
1. In commercial irrigation design, what is the primary purpose of hydraulic zoning?
A. Reduce pipe cost only
B. Separate areas by plant color
C. Match water demand and pressure requirements
D. Eliminate need for pumps
Answer: C
Rationale: Hydraulic zoning ensures each zone has similar flow and pressure needs, improving system
efficiency and preventing uneven irrigation distribution across large landscapes.
2. Which factor most directly affects friction loss in irrigation pipelines?
A. Pipe color
B. Water temperature only
C. Pipe diameter and flow rate
D. Valve brand
Answer: C
Rationale: Friction loss increases with higher flow rates and smaller pipe diameters, making these key
design considerations in hydraulic calculations.
3. What is the main advantage of head-to-head sprinkler coverage?
A. Reduces installation time
B. Ensures uniform water distribution
C. Eliminates need for controllers
D. Increases pipe lifespan
Answer: B
Rationale: Head-to-head coverage ensures each sprinkler’s spray reaches adjacent heads, promoting
uniform irrigation across the landscape.
4. Total Dynamic Head (TDH) in a pump system represents:
A. Only vertical lift
B. Only pipe friction
C. Combined pressure, elevation, and friction losses
D. Electrical consumption
Answer: C
Rationale: TDH includes elevation lift, friction losses, and required discharge pressure for proper pump
sizing.
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5. Which irrigation system is best for deep root watering with minimal evaporation loss?
A. Spray irrigation
B. Rotor system
C. Drip irrigation
D. Flood irrigation
Answer: C
Rationale: Drip irrigation delivers water directly to the root zone, reducing evaporation and improving
water efficiency.
6. A pump curve is primarily used to determine:
A. Pipe color coding
B. Electrical wiring layout
C. Pump performance at different flow rates
D. Soil moisture levels
Answer: C
Rationale: Pump curves show how flow rate and head pressure change with pump operation, essential
for correct selection.
7. Which irrigation component is used to prevent backflow contamination?
A. Solenoid valve
B. Backflow preventer
C. Pressure regulator
D. Rotor nozzle
Answer: B
Rationale: Backflow preventers stop contaminated water from reversing into potable water supplies.
8. Which pipe material is most commonly used in commercial irrigation systems?
A. Steel only
B. Copper only
C. PVC and HDPE
D. Rubber tubing
Answer: C
Rationale: PVC and HDPE are durable, cost-effective, and resistant to corrosion, making them standard
in irrigation systems.
North Carolina Irrigation Contractor Exam Level II
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
North Carolina Irrigation Contractor Exam — Level II — Summarized Coverage
The North Carolina Irrigation Contractor Level II Examination is a higher-level licensing exam
administered by the North Carolina Irrigation Contractors’ Licensing Board. It evaluates advanced
competency in irrigation system design, hydraulic calculations, water efficiency engineering,
installation standards, system troubleshooting, and contractor-level business and compliance
responsibilities. Level II places greater emphasis on design accuracy, pump sizing, pressure
management, and complex system evaluation compared to Level I.
Irrigation System Design & Engineering Principles
• Advanced irrigation layout design for commercial and large landscapes
• Zone balancing and hydraulic zoning strategies
• Head-to-head coverage design optimization
• Spray, rotor, drip, and specialty irrigation system integration
• Distribution uniformity and efficiency design principles
• System scalability for golf courses, parks, and large properties
Hydraulic Calculations & Water Flow
• Flow rate (GPM) calculations and system demand analysis
• Pressure loss and friction loss calculations in pipelines
• Pipe sizing based on velocity and flow requirements
• Static, dynamic, and residual pressure concepts
• Elevation and pressure variation adjustments
• Total dynamic head (TDH) calculations for pump systems
• Pump selection based on system demand
Pumping Systems & Water Supply
• Pump types (centrifugal, booster, submersible)
• Pump performance curves and interpretation
• Pump efficiency and horsepower selection
• Water source evaluation (well, municipal, surface water)
• Pump station design and installation basics
• Backflow prevention integration with pumping systems
Advanced Irrigation Components
• Valves, manifold systems, and zone control systems
• Solenoid valve troubleshooting and replacement
• Pressure regulation and flow control devices
• Filters for drip and micro-irrigation systems
• Sensors (rain, moisture, freeze, wind) and automation systems
• Smart irrigation controller integration and programming
System Installation & Construction Standards
• Deep trenching and large-scale pipe installation practices
• PVC, HDPE, and commercial-grade piping systems
• Jointing methods and leak prevention techniques
• Valve box installation and system accessibility standards
, Page 2 of 47
• Pressure testing procedures for installed systems
• Large-scale system commissioning and start-up procedures
Soil, Plant, and Water Interaction
• Advanced evapotranspiration (ET) scheduling principles
• Soil infiltration rate and water-holding capacity analysis
• Root zone depth and plant water demand modeling
• Turfgrass and landscape water requirement optimization
• Seasonal irrigation scheduling adjustments
Irrigation Troubleshooting & Diagnostics
• Diagnosing pressure loss in complex systems
• Uneven coverage correction strategies
• Pump failure and cavitation diagnosis
• Electrical valve and controller fault detection
• Leak detection in underground piping systems
• System performance auditing and efficiency correction
Electrical & Control Systems
• Advanced controller programming (multi-zone systems)
• Wiring diagrams for large irrigation systems
• Solenoid operation and electrical troubleshooting
• Sensor integration (ET controllers, soil probes, weather stations)
• Low-voltage system safety and diagnostics
Water Efficiency & Conservation Engineering
• Advanced water conservation design strategies
• Minimizing runoff and deep percolation losses
• Efficiency audits and system performance optimization
• Xeriscaping integration with irrigation design
• Pressure regulation for conservation compliance
Regulatory Compliance & Standards
• NC irrigation contractor licensing law compliance
• Backflow prevention requirements and inspection standards
• Environmental protection and groundwater safety
• Local irrigation codes and installation regulations
• Recordkeeping and inspection documentation requirements
Business, Project & Contractor Management
• Advanced job estimating and project bidding
• Material takeoffs and cost forecasting
• Labor productivity and project scheduling
• Contract documentation and scope of work definitions
• Profitability analysis and business decision-making
Scenario-Based Applications (High Priority)
• Designing full commercial irrigation systems from site plans
• Correcting hydraulic imbalance in multi-zone systems
• Selecting and sizing pumps for large irrigation projects
• Fixing pressure and flow inefficiencies in field systems
• Diagnosing controller, valve, and pump system failures
• Ensuring compliance with NC irrigation regulations and water efficiency standards
North Carolina Irrigation Contractor Exam — Level II
, Page 3 of 47
MCQ Practice Set 1 (Questions 1–50)
1. In commercial irrigation design, what is the primary purpose of hydraulic zoning?
A. Reduce pipe cost only
B. Separate areas by plant color
C. Match water demand and pressure requirements
D. Eliminate need for pumps
Answer: C
Rationale: Hydraulic zoning ensures each zone has similar flow and pressure needs, improving system
efficiency and preventing uneven irrigation distribution across large landscapes.
2. Which factor most directly affects friction loss in irrigation pipelines?
A. Pipe color
B. Water temperature only
C. Pipe diameter and flow rate
D. Valve brand
Answer: C
Rationale: Friction loss increases with higher flow rates and smaller pipe diameters, making these key
design considerations in hydraulic calculations.
3. What is the main advantage of head-to-head sprinkler coverage?
A. Reduces installation time
B. Ensures uniform water distribution
C. Eliminates need for controllers
D. Increases pipe lifespan
Answer: B
Rationale: Head-to-head coverage ensures each sprinkler’s spray reaches adjacent heads, promoting
uniform irrigation across the landscape.
4. Total Dynamic Head (TDH) in a pump system represents:
A. Only vertical lift
B. Only pipe friction
C. Combined pressure, elevation, and friction losses
D. Electrical consumption
Answer: C
Rationale: TDH includes elevation lift, friction losses, and required discharge pressure for proper pump
sizing.
, Page 4 of 47
5. Which irrigation system is best for deep root watering with minimal evaporation loss?
A. Spray irrigation
B. Rotor system
C. Drip irrigation
D. Flood irrigation
Answer: C
Rationale: Drip irrigation delivers water directly to the root zone, reducing evaporation and improving
water efficiency.
6. A pump curve is primarily used to determine:
A. Pipe color coding
B. Electrical wiring layout
C. Pump performance at different flow rates
D. Soil moisture levels
Answer: C
Rationale: Pump curves show how flow rate and head pressure change with pump operation, essential
for correct selection.
7. Which irrigation component is used to prevent backflow contamination?
A. Solenoid valve
B. Backflow preventer
C. Pressure regulator
D. Rotor nozzle
Answer: B
Rationale: Backflow preventers stop contaminated water from reversing into potable water supplies.
8. Which pipe material is most commonly used in commercial irrigation systems?
A. Steel only
B. Copper only
C. PVC and HDPE
D. Rubber tubing
Answer: C
Rationale: PVC and HDPE are durable, cost-effective, and resistant to corrosion, making them standard
in irrigation systems.
