Certified Irrigation Technician (CIT) Exam — Questions and Answers

Question 1: What is 'cycle and soak' programming designed to prevent?

Emitter clogging
Runoff on slopes or clay soils with slow infiltration (Correct answer)
Controller short-circuits
Backflow device fouling

Correct answer: Runoff on slopes or clay soils with slow infiltration

Cycle and soak applies multiple short irrigation cycles with rest periods to prevent runoff where soil infiltration is slow.

Question 2: A technician is tasked with installing a new irrigation system at a residential property. What is the legally required first step that must be taken several days before any trenching or digging begins?

Discuss the installation plan with the property owner.
Deliver all necessary pipe and materials to the job site.
Contact the local one-call utility notification center. (Correct answer)
Complete a site survey and flag all sprinkler head locations.

Correct answer: Contact the local one-call utility notification center.

Before any excavation, it is a legal requirement in most jurisdictions to contact the one-call utility notification center (e.g., by dialing 811). This service notifies member utility companies to mark the approximate location of their underground lines, preventing potentially dangerous and costly damage to gas, electric, water, and communication lines.

Question 3: A pop-up sprinkler head with a 4-inch pop-up height is most appropriate for:

Ground cover plantings up to 12 inches tall
Raised planter beds with 8-inch borders
Standard maintained turf grass mowed to 2-3 inches (Correct answer)
Areas with tall ornamental grasses over 12 inches

Correct answer: Standard maintained turf grass mowed to 2-3 inches

A 4-inch pop-up is standard for maintained turf areas where the grass is mowed to 2-3 inches. The nozzle rises above the grass canopy for unobstructed spray distribution and retracts below mower height when not in use.

Question 4: What minimum distribution uniformity does the Irrigation Association recommend for turfgrass irrigation systems?

0.65 (65%)
0.90 (90%)
0.50 (50%)
0.75 (75%) (Correct answer)

Correct answer: 0.75 (75%)

The Irrigation Association recommends a minimum DU of 0.75 for turfgrass, meaning the lowest-quarter areas receive at least 75% of the average application.

Question 5: What type of irrigation system is best suited for areas with limited water supply?

Drip irrigation (Correct answer)
Sprinkler irrigation
Surface irrigation
Flood irrigation

Correct answer: Drip irrigation

Drip irrigation is best suited for areas with limited water supply due to its exceptional water efficiency. By delivering water directly to the plant roots through emitters, it minimizes evaporation and runoff, ensuring nearly all the water is utilized by the plants. This targeted approach significantly reduces overall water consumption compared to other irrigation methods.

Question 6: When troubleshooting an irrigation zone that will not turn on, the technician confirms the controller is sending 24 VAC. The next logical step using a multimeter is to:

Test the voltage at the backflow preventer.
Measure the resistance (ohms) of the solenoid and field wiring at the controller. (Correct answer)
Check the amperage at the transformer.
Verify the GPM of the sprinkler heads in that zone.

Correct answer: Measure the resistance (ohms) of the solenoid and field wiring at the controller.

After confirming the controller is outputting power, the next step is to check the integrity of the field circuit. By disconnecting the zone wire and common wire from the controller and measuring the resistance (ohms) between them, a technician can determine if the circuit is open (broken wire), shorted, or has a good solenoid coil without having to walk out to the valve box first.

Question 7: A homeowner reports that their controller skipped several scheduled watering days after a large storm. The most likely cause is:

An active rain sensor or weather-based skip that suspended irrigation after detecting sufficient rainfall (Correct answer)
The master valve solenoid failed and disconnected the programming memory
A blown fuse in the controller's transformer circuit
The controller's seasonal adjust feature was automatically reduced to 0%

Correct answer: An active rain sensor or weather-based skip that suspended irrigation after detecting sufficient rainfall

Rain sensors and smart weather-based controllers are designed to skip or suspend scheduled irrigation when rainfall meets or exceeds a set threshold, preventing unnecessary watering after a significant storm event.

Question 8: Which type of wire is specifically designed and rated for direct burial in landscape and irrigation applications?

UF-B (Correct answer)
Coaxial
Romex (NM-B)
THHN

Correct answer: UF-B

UF-B (Underground Feeder) cable is the correct choice as it is designed for direct burial in the ground without the need for conduit. Its outer jacket is water, fungus, and corrosion resistant, providing the necessary protection for underground applications. THHN and Romex are not rated for direct burial.

Question 9: If the reference ET is 0.25 inches/day and the crop coefficient (Kc) is 0.8, the crop water requirement is:

0.20 inches/day (Correct answer)
0.80 inches/day
0.25 inches/day
0.31 inches/day

Correct answer: 0.20 inches/day

Crop ET equals reference ET multiplied by the crop coefficient: 0.25 × 0.8 = 0.20 inches per day.

Question 10: A technician needs to calculate the precipitation rate for a sprinkler zone to program the controller correctly. Which formula is commonly used for this calculation?

PR = (GPM x 96.3) / Area (Correct answer)
PR = (GPM x Area) / 96.3
PR = GPM / (Area x 96.3)
PR = (Area x 96.3) / GPM

Correct answer: PR = (GPM x 96.3) / Area

The standard formula to calculate the precipitation rate (PR) in inches per hour is: PR = (Total Gallons Per Minute of all heads in the zone x 96.3) / Total Area of the zone in square feet. The constant 96.3 is a conversion factor that simplifies the calculation from gallons per minute over a square footage area into inches per hour.

Question 11: When winterizing an irrigation system with PVC piping using an air compressor, what is the generally accepted maximum air pressure (PSI) to use to avoid damaging components?

100-110 PSI
25-35 PSI
90-100 PSI
40-80 PSI (Correct answer)

Correct answer: 40-80 PSI

Most industry guidelines recommend keeping the air pressure between 40 and 80 PSI for systems with rigid PVC pipes. Pressures exceeding 80 PSI can crack PVC fittings, damage valve internals, or break sprinkler heads. For polyethylene (poly) pipe, the maximum pressure should be even lower, around 50 PSI. [19, 20, 23]

Question 12: When programming an irrigation controller, what is the difference between a 'program' and a 'start time'?

They are the same thing
A program defines which zones run and for how long; a start time defines when the program begins its sequence (Correct answer)
A program is for drip zones only; start times are for spray zones
A start time assigns zones to groups; a program sets the watering days

Correct answer: A program defines which zones run and for how long; a start time defines when the program begins its sequence

A program is a complete watering schedule that includes assigned zones, their run times, and watering days. A start time tells the controller when to begin running that program's zone sequence. Multiple start times on one program cause it to run multiple times per day.

Question 13: When replacing a controller battery, what is its primary function in most modern irrigation controllers?

To store all programming permanently
To power the solenoid valves during operation
To maintain the real-time clock (date and time) during power outages so the schedule runs at the correct times (Correct answer)
To power the Wi-Fi antenna

Correct answer: To maintain the real-time clock (date and time) during power outages so the schedule runs at the correct times

In modern controllers with non-volatile memory, the battery's primary function is maintaining the real-time clock during power outages. The programming is stored in non-volatile memory (which doesn't need power), but the clock needs continuous power to keep accurate time.

Question 14: Soil compaction reduces water infiltration primarily because it:

Increases organic matter decomposition rate
Crushes aggregates and reduces pore space between particles (Correct answer)
Increases soil temperature significantly
Lowers soil pH below plant tolerance

Correct answer: Crushes aggregates and reduces pore space between particles

Compaction collapses soil aggregates and reduces the volume and connectivity of pore spaces, leaving fewer pathways for water to infiltrate.

Question 15: To prevent excessive friction loss and the damaging effects of water hammer, what is the generally accepted maximum design velocity for water in PVC irrigation mainlines?

10 feet per second (fps)
5 feet per second (fps) (Correct answer)
8 feet per second (fps)
2 feet per second (fps)

Correct answer: 5 feet per second (fps)

The irrigation industry standard, recommended by organizations like the Irrigation Association and manufacturers, is to keep water velocity at or below 5 feet per second (fps). Exceeding this velocity dramatically increases friction loss and the risk of surge pressure (water hammer).

Question 16: High soil salinity harms turfgrass primarily because:

It causes soil to freeze at higher temperatures
Dissolved salts draw water out of plant roots through osmosis, causing drought-like stress (Correct answer)
Salt blocks sunlight from reaching the root zone
Salt prevents nitrogen uptake by soil bacteria

Correct answer: Dissolved salts draw water out of plant roots through osmosis, causing drought-like stress

High salinity creates an osmotic potential outside the roots that reverses normal water uptake, causing water to move out of roots rather than in, producing physiological drought stress.

Question 17: An irrigation system with a booster pump that can develop pressures exceeding the supply pressure requires which minimum level of backflow protection?

Atmospheric Vacuum Breaker
Pressure Vacuum Breaker
Air gap separation only
Double Check Valve Assembly (Correct answer)

Correct answer: Double Check Valve Assembly

A booster pump can create backpressure conditions where downstream pressure exceeds supply pressure. A DCVA or RPZ is required because both protect against backpressure. PVBs and AVBs only protect against backsiphonage and would fail under backpressure conditions.

Question 18: Which EPA program labels water-efficient irrigation products and encourages conservation through utility rebates?

WaterSense (Correct answer)
Energy Star
LEED certification
USDA NRCS EQIP

Correct answer: WaterSense

EPA's WaterSense program certifies water-efficient products and partners with utilities to offer rebates, promoting irrigation water conservation.

Question 19: A technician is setting up a schedule for a zone with clay soil on a steep slope, which is causing significant water runoff. Which controller feature is specifically designed to mitigate this issue by splitting a zone's total run time into smaller, separated applications?

Seasonal Adjust
Cycle and Soak (Correct answer)
Sensor Bypass
Master Valve Delay

Correct answer: Cycle and Soak

Cycle and Soak (also called Multi-Cycle or Intelligent Soak) is a programming feature that breaks up a station's total run time into shorter cycles separated by a soak period. This allows water time to infiltrate into tight soils or sloped areas, preventing wasteful runoff.

Question 20: What is the importance of a backflow preventer in an irrigation system?

To reduce water usage
To prevent water contamination from backflow (Correct answer)
To increase water pressure
To ensure water reaches the plants faster

Correct answer: To prevent water contamination from backflow

A backflow preventer is a crucial safety device in an irrigation system designed to protect the potable water supply. It prevents contaminated water from the irrigation system (which might contain fertilizers or pesticides) from flowing back into the main drinking water lines. This ensures the public water supply remains safe and free from harmful pollutants.

Question 21: What is the most common cause of dry spots in a zone when run time appears adequate?

Excessive system pressure
Excess fertilizer application
Too many zones on one controller
Low distribution uniformity from improper spacing or worn nozzles (Correct answer)

Correct answer: Low distribution uniformity from improper spacing or worn nozzles

Dry spots despite sufficient run time usually result from poor DU caused by improper head spacing or worn nozzles leaving low-coverage areas under-irrigated.

Question 22: A homeowner reports that their irrigation system runs at the correct times but Zone 3 never activates. The controller display shows Zone 3 is programmed and running. The most likely cause is:

A broken or shorted zone wire or failed solenoid on Zone 3's valve (Correct answer)
The rain sensor is preventing operation
The master valve is not opening
A faulty transformer

Correct answer: A broken or shorted zone wire or failed solenoid on Zone 3's valve

If the controller shows Zone 3 is running but no water flows on that zone while other zones work, the problem is isolated to Zone 3's circuit — either the field wire is broken/shorted or the valve solenoid has failed. A master valve or rain sensor issue would affect all zones.

Question 23: Which of the following backflow prevention devices is unsuitable for applications where it would be under continuous pressure for more than 12 hours?

Double Check Valve Assembly (DCVA)
Atmospheric Vacuum Breaker (AVB) (Correct answer)
Pressure Vacuum Breaker (PVB)
Reduced Pressure Zone Assembly (RPZ)

Correct answer: Atmospheric Vacuum Breaker (AVB)

An Atmospheric Vacuum Breaker (AVB) is designed for backsiphonage protection only and must be installed on the discharge side of the last control valve. It is not designed to be under continuous pressure for more than a 12-hour period, as the internal components can fail or stick, rendering it ineffective.

Question 24: When programming a controller for cycle and soak, what is the primary purpose of the soak time between cycles?

To let the controller reset between programs
To allow the pump to cool down
To reduce water pressure in the mainline
To allow water to infiltrate into the soil and prevent runoff (Correct answer)

Correct answer: To allow water to infiltrate into the soil and prevent runoff

Cycle and soak divides a zone's total run time into shorter cycles with soak periods between them. The soak time allows water to infiltrate into the soil, particularly on slopes or clay soils, preventing surface runoff and improving irrigation efficiency.

Question 25: What is the primary purpose of installing a surge protection device (SPD) at an irrigation controller?

To increase the number of zones the controller can operate simultaneously
To limit voltage spikes from lightning or power surges from reaching controller circuitry (Correct answer)
To regulate solenoid current to a constant 0.25 amps per zone
To step down 120 VAC utility power to 24 VAC for the solenoids

Correct answer: To limit voltage spikes from lightning or power surges from reaching controller circuitry

Surge protection devices clamp transient overvoltages caused by nearby lightning strikes or utility switching events before they can damage the controller's sensitive electronics. They do not transform voltage, expand zone capacity, or regulate solenoid current.

Question 26: After solvent welding several PVC joints on a hot, dry day (approx. 90°F), a technician is anxious to test the mainline for leaks. According to most solvent cement manufacturers' guidelines for pipes 1¼" or smaller under 160 psi, what is the minimum cure time before the system can be safely pressurized?

5 minutes
1 hour
15 minutes (Correct answer)
Immediately

Correct answer: 15 minutes

Cure time is the period required for a solvent-welded joint to gain full strength. While set time (when the joint can be handled) is very short, pressurizing the system too early can cause joint failure. For smaller pipes in warm conditions, a minimum cure time of 15 minutes is often specified for pressures up to 160 psi, though longer times are needed for higher pressures, larger pipes, or colder temperatures.

Question 27: What is the purpose of a rain sensor on an irrigation system?

Measure total annual rainfall
Trigger backflow preventer testing
Automatically suspend irrigation during or after rain (Correct answer)
Increase flow rate during dry spells

Correct answer: Automatically suspend irrigation during or after rain

A rain sensor automatically overrides and suspends scheduled irrigation during or after sufficient rainfall to prevent overwatering.

Question 28: What should be checked first when troubleshooting an irrigation system?

Check the power supply (Correct answer)
Check the water pressure
Check the valves
Check the weather conditions

Correct answer: Check the power supply

When troubleshooting an irrigation system, especially if it's not turning on, checking the power supply is the fundamental first step. Without adequate power, no other component can function, making it the most logical starting point for diagnosis.

Question 29: A pressure gauge at the base of a hill reads 60 PSI. The irrigation zone at the top of the hill is 46 feet higher in elevation. What is the approximate pressure available at the top of the hill (ignoring friction loss)?

20 PSI
60 PSI
80 PSI
40 PSI (Correct answer)

Correct answer: 40 PSI

Pressure loss due to elevation change is approximately 0.433 PSI per foot of elevation gain. For 46 feet: 46 x 0.433 = approximately 20 PSI loss. Available pressure at the top: 60 - 20 = 40 PSI.

Question 30: When gluing PVC pipe, the solvent cement creates a joint by:

Hardening like epoxy to create a mechanical bond
Expanding to fill the gap between pipe and fitting
Adhering to the outside surface like an adhesive
Chemically dissolving (melting) the PVC surfaces so they fuse together when the solvent evaporates (Correct answer)

Correct answer: Chemically dissolving (melting) the PVC surfaces so they fuse together when the solvent evaporates

PVC solvent cement is not a glue — it is a chemical solvent that dissolves the surface of both the pipe and fitting. When the dissolved surfaces are pressed together and the solvent evaporates, the PVC molecules intermingle and re-solidify into a single fused joint.

Question 31: What is the primary water-saving advantage of drip irrigation over sprinkler irrigation?

Higher flow rates deliver water faster
Drip systems require no filters
Water is applied at the root zone, reducing evaporation and wind drift (Correct answer)
Drip systems operate at higher pressure

Correct answer: Water is applied at the root zone, reducing evaporation and wind drift

Drip irrigation delivers water directly to the root zone, significantly reducing losses from evaporation, wind drift, and surface runoff.

Question 32: What is the purpose of a valve manifold in irrigation system installation?

To filter water for the entire system
To increase system pressure
To connect the system to the water heater
To group multiple zone valves together in one accessible location for easier maintenance and inspection (Correct answer)

Correct answer: To group multiple zone valves together in one accessible location for easier maintenance and inspection

A valve manifold groups zone valves together in a single location (typically housed in a large valve box) so all valves can be accessed for maintenance, adjustment, or troubleshooting without searching for individual valves scattered throughout the landscape.

Question 33: What is the benefit of using rainwater harvesting in irrigation systems?

It provides a sustainable and cost-effective water source (Correct answer)
It reduces the amount of rainfall
It requires more maintenance
It increases water consumption

Correct answer: It provides a sustainable and cost-effective water source

The benefit of using rainwater harvesting in irrigation systems is that it provides a sustainable and cost-effective water source. Collecting and storing rainwater reduces reliance on municipal or well water, lowering utility bills and conserving precious freshwater resources. This eco-friendly approach minimizes environmental impact and offers a resilient water supply, especially in regions prone to drought.

Question 34: How does water retention in soil affect irrigation needs?

Soil type is not important for irrigation
Water retention does not affect irrigation needs
Water retention requires more frequent watering in all cases
Soil with high retention requires less frequent watering (Correct answer)

Correct answer: Soil with high retention requires less frequent watering

Water retention in soil significantly affects irrigation needs because it dictates how long the soil can hold moisture for plants. Soil with high water retention, like clay, can store more water and therefore requires less frequent watering. Conversely, sandy soils with low retention drain quickly and need more frequent, albeit shorter, irrigation cycles to keep plants adequately hydrated.

Question 35: What causes 'root intrusion' in subsurface drip emitters?

UV degradation of the tubing
Excessive operating pressure
Plant roots growing into and blocking emitter orifices (Correct answer)
High iron content in the water supply

Correct answer: Plant roots growing into and blocking emitter orifices

Root intrusion occurs when plant roots grow toward moisture and into drip emitter orifices, physically blocking water flow.

Question 36: Which controller type uses local weather data to automatically adjust irrigation run times?

Mechanical timer
Simple digital timer
ET-based (SMART) controller (Correct answer)
Manual valve controller

Correct answer: ET-based (SMART) controller

ET-based SMART controllers use real-time weather data to calculate evapotranspiration and automatically adjust schedules.

Question 37: A proper irrigation system maintenance checklist should include all of the following EXCEPT:

Inspecting and adjusting sprinkler head alignment and coverage
Checking for and repairing leaks at heads, fittings, and valves
Adding chlorine to the mainline to improve water quality (Correct answer)
Testing the rain sensor and controller programming

Correct answer: Adding chlorine to the mainline to improve water quality

While sprinkler inspection, leak repair, and controller/sensor testing are standard maintenance items, adding chlorine to the mainline is not a routine maintenance procedure. Chlorine treatment is only used in specific situations like treating drip system biological clogging under professional supervision.

Question 38: While performing system maintenance, a technician notices that one entire zone of rotor heads is not operating, while all other zones function correctly. The controller indicates the zone is active. Which of the following is the LEAST likely cause of this specific problem?

A malfunctioning diaphragm in the zone valve
A faulty zone valve solenoid
A broken mainline pipe before the zone valve (Correct answer)
A cut in the field wiring to that specific zone

Correct answer: A broken mainline pipe before the zone valve

A broken mainline pipe would affect all zones downstream from the break, or cause a constant leak, rather than isolating the problem to a single zone that won't turn on. A faulty solenoid, a cut in the specific zone wire, or a malfunctioning valve diaphragm are all common electrical or mechanical failures that would prevent a single, specific zone from operating.

Question 39: What is a catch-can test primarily used to measure?

Backflow preventer efficiency
Controller programming accuracy
Precipitation rate and distribution uniformity (Correct answer)
Soil permeability rate

Correct answer: Precipitation rate and distribution uniformity

A catch-can test measures precipitation rate and distribution uniformity by collecting sprinkler output in small containers placed around a zone.

Question 40: A flow sensor is connected to the irrigation controller. What information does it provide to help manage the system?

Soil moisture levels at each zone
Electrical current draw of each solenoid
Real-time flow rate data that can detect leaks, broken pipes, or clogged nozzles by comparing actual flow to expected flow (Correct answer)
The temperature of water in the mainline

Correct answer: Real-time flow rate data that can detect leaks, broken pipes, or clogged nozzles by comparing actual flow to expected flow

A flow sensor measures the actual flow rate through the mainline and reports it to the controller. The controller compares this to expected flow rates for each zone and can detect high-flow conditions (broken pipe) or low-flow conditions (clogged nozzles or closed valves).

Question 41: When installing irrigation components near a swimming pool, what minimum setback distance is typically required for sprinkler heads?

Sprinkler spray should not reach the pool deck or pool water — typically 5-10 feet depending on local code, and drip or subsurface irrigation is preferred near pools (Correct answer)
No setback is required
50 feet minimum
100 feet minimum

Correct answer: Sprinkler spray should not reach the pool deck or pool water — typically 5-10 feet depending on local code, and drip or subsurface irrigation is preferred near pools

Sprinkler heads must be positioned so their spray does not reach the pool deck (slip hazard) or pool water (introduces fertilizer, debris, and pathogens). Most codes require 5-10 feet setback, and drip or subsurface irrigation is preferred for pool-adjacent landscaping.

Question 42: A zone valve (also called a control valve) in an irrigation system is typically what type of valve?

Ball valve with manual handle
Gate valve
Globe valve operated by a solenoid (Correct answer)
Butterfly valve

Correct answer: Globe valve operated by a solenoid

Irrigation zone valves are typically globe-pattern valves operated by a 24 VAC solenoid. The solenoid controls a small pilot flow that opens or closes a rubber diaphragm, which in turn controls the main water flow through the valve.

Question 43: What is a key component of a properly functioning irrigation system?

Only a water source
Pipes only
Pipes, valves, emitters, and controllers (Correct answer)
Sprinklers alone

Correct answer: Pipes, valves, emitters, and controllers

A properly functioning irrigation system relies on several interconnected components working in harmony. Pipes transport water, valves control its flow to different zones, emitters (like sprinklers or drip lines) distribute water to the plants, and controllers automate the watering schedule. All these parts are essential for efficient and effective water delivery.

Question 44: An irrigation system work order should document which of the following upon job completion?

Only the total invoice amount and payment method
The customer's irrigation schedule preferences for the next season
The technician's personal contact information for future client calls
Parts used, time on site, repairs made, and any system anomalies observed (Correct answer)

Correct answer: Parts used, time on site, repairs made, and any system anomalies observed

A complete work order serves as a legal and operational record. It should capture all parts consumed, labor time, work performed, and any issues noted so that future technicians and the client have an accurate service history.

Question 45: A zone has high clay soil with a 0.3 in/hr infiltration rate and a precipitation rate of 1.2 in/hr. The best scheduling strategy is:

Cycle and soak with multiple short cycles (Correct answer)
Raise system pressure
Increase nozzle size to apply more water
One long single run

Correct answer: Cycle and soak with multiple short cycles

Cycle and soak is ideal for clay soils because it breaks irrigation into short bursts, allowing slow-infiltrating soil to absorb water between cycles.

Question 46: What is 'deficit irrigation'?

Irrigation without a controller
Irrigating above crop water requirements
An irrigation system with broken components
Intentionally applying less water than full crop ET to conserve water (Correct answer)

Correct answer: Intentionally applying less water than full crop ET to conserve water

Deficit irrigation intentionally applies less water than full ET requirements to conserve water, accepting minor plant stress or yield reduction.

Question 47: A client wants to water their lawn at 6:00 AM but the system has 4 zones that cannot run simultaneously due to insufficient water supply. The controller should be programmed to:

Run all zones at 6:00 AM on the same program
Create 4 separate programs with staggered start times
Stack zones sequentially on the same program with a 6:00 AM start time (Correct answer)
Use cycle and soak on all zones simultaneously

Correct answer: Stack zones sequentially on the same program with a 6:00 AM start time

When zones cannot run simultaneously, they should be stacked sequentially on the same program with a single start time. The controller will automatically run each zone in sequence after the previous one completes, starting at the programmed time.

Question 48: A client's controller is programmed for peak summer watering. To efficiently reduce water usage in the cooler autumn months without editing each zone's run time individually, what is the BEST method?

Manually run the system only when the landscape appears dry.
Use the 'Seasonal Adjust' or 'Water Budget' feature to set a lower percentage. (Correct answer)
Delete one of the program start times.
Reprogram all station run times to shorter durations.

Correct answer: Use the 'Seasonal Adjust' or 'Water Budget' feature to set a lower percentage.

The 'Seasonal Adjust' or 'Water Budget' feature is designed specifically for this purpose. It allows a user to make a global, percentage-based change to the run times of all stations in a program, which is much more efficient than changing each one individually.

Question 49: An irrigation system installed with reclaimed (recycled) water must have what distinguishing feature on all above-ground components?

Yellow caution tape
Purple identification — purple pipe, purple valve box lids, purple tags on heads, and warning signs stating 'RECLAIMED WATER - DO NOT DRINK' (Correct answer)
No special identification is required
Red paint

Correct answer: Purple identification — purple pipe, purple valve box lids, purple tags on heads, and warning signs stating 'RECLAIMED WATER - DO NOT DRINK'

All reclaimed water irrigation components must be clearly identified with purple coloring (Pantone 522C) and warning signage. This includes purple pipe, purple valve box lids, purple caps on heads, and signs at the controller, meter, and visible valve boxes.

Question 50: A technician needs to connect a 1-inch polyethylene (poly) pipe to a spiral barb fitting and secure it with a stainless steel clamp. Which of the following tools is specifically designed to properly tighten the clamp for a secure, leak-free connection?

A strap wrench
A solvent cement dauber
A pair of pinch clamp crimpers (Correct answer)
A tubing cutter

Correct answer: A pair of pinch clamp crimpers

Polyethylene pipe is joined to barb fittings using mechanical clamps, not solvent cement. Pinch clamp crimpers (or pincers) are specifically designed to tighten a stainless steel pinch or ear clamp around the pipe and fitting, creating a durable and watertight seal that resists pulling apart under pressure.

Question 51: OSHA regulations require that a trench deeper than what depth must have cave-in protection (shoring, sloping, or trench box)?

6 feet
3 feet
5 feet (Correct answer)
4 feet

Correct answer: 5 feet

OSHA requires that trenches 5 feet or deeper must have cave-in protection systems in place, such as sloping, benching, shoring, or trench shields, unless the excavation is made entirely in stable rock.

Question 52: What does ET stand for in irrigation scheduling?

Evapotranspiration (Correct answer)
Emitter Technology
Estimated Throughput
Effective Timing

Correct answer: Evapotranspiration

ET stands for evapotranspiration, the combined water loss from soil evaporation and plant transpiration.

Question 53: What is the purpose of maintaining a daily job log or service report for irrigation work?

To document work performed, conditions found, materials used, time spent, and recommendations — providing legal protection, customer communication, and business records (Correct answer)
It is required only for warranty claims
It is only needed for new installations, not repairs
It has no practical purpose beyond billing

Correct answer: To document work performed, conditions found, materials used, time spent, and recommendations — providing legal protection, customer communication, and business records

Daily documentation serves multiple purposes: legal protection in case of disputes or liability claims, accurate billing records, customer communication about system condition, tracking of recurring problems, warranty documentation, and business performance analysis.

Question 54: What is the purpose of a surge protector or transient voltage suppressor on an irrigation controller?

To boost voltage to distant solenoids
To regulate the 24 VAC output to solenoids
To protect the controller's electronic components from lightning strikes and power surges traveling through the field wiring (Correct answer)
To prevent short circuits in the zone wiring

Correct answer: To protect the controller's electronic components from lightning strikes and power surges traveling through the field wiring

Surge protectors on irrigation controllers absorb transient voltage spikes caused by lightning strikes near field wiring, power line surges, or inductive kickback from solenoids. Without protection, these surges can destroy the controller's circuit board.

Question 55: A client with a working irrigation system and a rain sensor reports that their sprinklers did not run after a very brief, light shower. The controller is programmed correctly and the sensor bypass switch is 'off'. What is the MOST likely reason the system did not activate?

The sensor's sensitivity is set to a low rainfall amount (e.g., 1/8 inch) and was triggered. (Correct answer)
The master valve is stuck closed.
There is a short in the field wiring.
The controller's transformer has failed.

Correct answer: The sensor's sensitivity is set to a low rainfall amount (e.g., 1/8 inch) and was triggered.

Rain sensors have adjustable sensitivity settings. If set to a very sensitive level, such as 1/8 inch, even a small amount of rain can saturate the hygroscopic discs and interrupt the watering cycle, which is the sensor's intended function.

Question 56: What does the 'seasonal adjustment' (or 'water budget') feature on an irrigation controller allow a technician to do?

Add or remove irrigation zones without rewiring the controller
Override individual zone schedules during peak demand hours
Automatically detect the soil type and adjust flow rates accordingly
Globally increase or decrease all zone run times by a percentage to account for seasonal climate changes (Correct answer)

Correct answer: Globally increase or decrease all zone run times by a percentage to account for seasonal climate changes

The seasonal adjustment feature applies a global percentage increase or decrease to all zone run times, allowing easy adaptation to seasonal changes in evapotranspiration without reprogramming each zone individually.

Question 57: When wiring multiple electronic zone valves to a standard irrigation controller, a single wire provides the shared electrical return path for all solenoids. To which terminal on the controller is this wire connected?

P/MV (Pump/Master Valve)
SEN (Sensor)
Any numbered station terminal
C (Common) (Correct answer)

Correct answer: C (Common)

The 'C' or 'Common' terminal is the connection point for the common wire. This wire is connected to one lead on every solenoid in the system, creating a shared return path for the electrical circuit that activates the valves.

Question 58: The Hazen-Williams formula is used in irrigation system design primarily to calculate:

Friction loss (pressure drop) in pressurized pipes (Correct answer)
Sprinkler precipitation rate for a given nozzle
Soil infiltration capacity and percolation time
Evapotranspiration (ET) rates for a given climate zone

Correct answer: Friction loss (pressure drop) in pressurized pipes

The Hazen-Williams formula is the standard hydraulic tool for calculating friction head loss in pressurized irrigation pipes. Designers use it to size pipes so operating pressure remains within acceptable limits throughout the system.

Question 59: The soil infiltration rate determines:

The number of zones on the controller
The color of the irrigation pipe needed
The maximum rate at which water can be applied without causing surface runoff (Correct answer)
How much electricity the pump uses

Correct answer: The maximum rate at which water can be applied without causing surface runoff

The soil infiltration rate (also called intake rate) is the maximum speed at which soil can absorb water. If sprinklers apply water faster than this rate, the excess runs off the surface, wasting water and potentially causing erosion.

Question 60: An irrigation system has zones that randomly turn on and off at unpredictable times. The controller does not show these zones as active. What is the most likely cause?

A short circuit in the field wiring is allowing stray current to activate solenoids when other zones run or when external electrical interference occurs (Correct answer)
The sprinkler heads are defective
The water pressure is fluctuating
The controller has a software bug

Correct answer: A short circuit in the field wiring is allowing stray current to activate solenoids when other zones run or when external electrical interference occurs

Random, phantom zone activation not shown on the controller indicates that stray current is reaching solenoids through damaged field wiring. Short circuits between zone wires, damaged insulation, or water-saturated splice connections can leak enough current to partially or fully open solenoid valves.

Question 61: A customer reports that one zone has significantly lower water pressure than all other zones. After confirming adequate supply pressure, the technician should investigate:

The rain sensor
The controller programming for that zone
The backflow preventer only
The zone valve for partial obstruction, a leak on the zone's lateral line, or a partially closed isolation valve (Correct answer)

Correct answer: The zone valve for partial obstruction, a leak on the zone's lateral line, or a partially closed isolation valve

Low pressure isolated to one zone while others are normal indicates a zone-specific problem: the zone valve may be partially obstructed by debris, there may be a pipe leak on the lateral losing water and pressure, or a manual shutoff valve may be partially closed.

Question 62: An irrigation system has a static pressure of 80 PSI at the backflow preventer. The total pressure loss from elevation change is 5 PSI. The friction loss through the mainline and zone valve is 11 PSI. The friction loss through the lateral lines for that zone is 9 PSI. What is the available dynamic pressure at the base of the sprinkler heads in that zone?

60 PSI
80 PSI
69 PSI
55 PSI (Correct answer)

Correct answer: 55 PSI

To find the available dynamic pressure at the head, all pressure losses must be subtracted from the initial static pressure. The calculation is: 80 PSI (Static) - 5 PSI (Elevation) - 11 PSI (Mainline/Valve Loss) - 9 PSI (Lateral Loss) = 55 PSI.

Question 63: What is the purpose of a master valve in an irrigation system?

To manually shut off water for winterization only
To act as a safety valve that opens only when the controller activates a zone, preventing water flow when no zones are running (Correct answer)
To regulate system pressure to each zone
To serve as a backflow prevention device

Correct answer: To act as a safety valve that opens only when the controller activates a zone, preventing water flow when no zones are running

A master valve is installed on the mainline and is controlled by the controller's master valve circuit. It opens only when the controller activates a zone, ensuring that no water flows through the mainline when the system is idle, preventing waste from leaks or broken pipes.

Question 64: Using a multimeter, a technician tests a controller by placing probes on the 'C' (Common) terminal and the terminal for an activated zone 5. The meter reads 0 VAC. A separate test across the transformer's 24V output terminals reads 26 VAC. What is the MOST likely cause of the 0 VAC reading at the zone terminal?

The field wiring for zone 5 is shorted.
The transformer is faulty.
The solenoid for zone 5 has an open coil.
The controller's internal fuse is blown or its circuit protection is tripped. (Correct answer)

Correct answer: The controller's internal fuse is blown or its circuit protection is tripped.

Since the transformer is confirmed to be producing 26 VAC, the problem lies within the controller's power distribution. A reading of 0 VAC at the station terminal indicates that no power is being sent out. This is a classic symptom of a blown fuse or tripped internal circuit breaker, which interrupts the flow of power from the transformer to the station terminals.

Question 65: A technician is programming a controller with three programs (A, B, C). Which scenario best describes the correct use of multiple programs?

Set all programs to the same start time to ensure uniform watering across the property
Assign turf zones to Program A with frequent short cycles and shrub zones to Program B with less frequent deep cycles (Correct answer)
Use Program C exclusively for drip zones since drip systems require the most water
Run all zones on the same schedule regardless of plant type

Correct answer: Assign turf zones to Program A with frequent short cycles and shrub zones to Program B with less frequent deep cycles

Multiple programs allow different irrigation schedules tailored to each plant type's water needs. Turf typically needs frequent, shorter cycles while shrubs benefit from less frequent but deeper watering, making separate programs the correct approach.

Question 66: A technician notices the controller's display shows 'SENSOR OPEN' or a similar fault. The appropriate first diagnostic step is to:

Reprogram all zones from scratch to clear the fault code
Increase the transformer voltage to overcome the sensor resistance
Replace the controller's main circuit board immediately
Check the rain or flow sensor wiring for breaks, corrosion, or a sensor bypass jumper that may be missing (Correct answer)

Correct answer: Check the rain or flow sensor wiring for breaks, corrosion, or a sensor bypass jumper that may be missing

A 'SENSOR OPEN' fault typically indicates the controller detects an open circuit at the sensor terminal, which is most commonly caused by broken wiring, a corroded connection, or a missing bypass jumper when no sensor is installed. Inspecting wiring and connections is the correct first step.

Question 67: When designing a drip irrigation zone, the maximum recommended run length (from the supply point to the last emitter) is limited primarily by:

The controller's zone capacity
Pressure loss due to friction, which causes the last emitters to deliver significantly less water than the first emitters if the run is too long (Correct answer)
The color of the tubing
The manufacturer's warranty terms

Correct answer: Pressure loss due to friction, which causes the last emitters to deliver significantly less water than the first emitters if the run is too long

Drip tubing run length is limited by friction loss along the tube. As water flows through the narrow tubing, pressure drops progressively. If the run is too long, the last emitters receive substantially less pressure and deliver less water, resulting in non-uniform irrigation.

Question 68: What does a 'seasonal adjust' or 'water budget' feature on a controller allow the technician to do?

Set different programs for summer and winter
Add or remove zones from a program
Apply a percentage adjustment to all programmed run times without changing individual station times (Correct answer)
Change which days irrigation occurs

Correct answer: Apply a percentage adjustment to all programmed run times without changing individual station times

The seasonal adjust (water budget) feature applies a percentage multiplier to all run times. For example, setting it to 75% would reduce all zone run times by 25%. This allows quick seasonal adjustments without reprogramming each zone individually.

Question 69: Trenching in heavy clay soil requires special consideration because:

Clay is always dry and easy to dig
Clay trenches never cave in
Clay soil tends to smear and seal the trench walls, which can direct water along the trench line (creating a 'French drain' effect) and slow backfill compaction (Correct answer)
Clay has no effect on irrigation installation

Correct answer: Clay soil tends to smear and seal the trench walls, which can direct water along the trench line (creating a 'French drain' effect) and slow backfill compaction

Clay soil presents unique installation challenges: the smooth trench walls can channel water along the pipe (creating subsurface drainage paths), clay clumps are difficult to compact as backfill, and clay expands and contracts with moisture changes, potentially shifting pipes and heads.

Question 70: A commercial property requires irrigation between midnight and 6:00 AM only. The system has 24 zones each requiring 15 minutes of run time. How many programs with separate start times are needed to fit within the watering window?

1 program with 1 start time (Correct answer)
2 programs with 1 start time each
1 program with 2 start times
4 programs with staggered start times

Correct answer: 1 program with 1 start time

With 24 zones at 15 minutes each, the total run time is 360 minutes (6 hours). Since the zones run sequentially within a program, one program with a single start time at midnight will complete all zones by 6:00 AM, exactly fitting the watering window.

Question 71: The precipitation rate of a sprinkler head is defined as:

The distance the sprinkler throws water
The total gallons of water the head delivers per cycle
The pressure at which the head operates
The depth of water applied per unit of time, typically measured in inches per hour (Correct answer)

Correct answer: The depth of water applied per unit of time, typically measured in inches per hour

Precipitation rate is the depth of water applied over an area per unit of time, measured in inches per hour. It determines how long each zone must run to apply the required depth of water and must be matched to the soil's infiltration rate to prevent runoff.

Question 72: A zone valve is stuck open (water continues flowing even when the controller turns off the zone). What should the technician check first?

The rain sensor
The controller's transformer
The solenoid, diaphragm, and bleed port for debris or damage (Correct answer)
The water meter for accuracy

Correct answer: The solenoid, diaphragm, and bleed port for debris or damage

A valve stuck open is typically caused by debris in the diaphragm or bleed port, a torn diaphragm, or a solenoid that isn't seating properly. These components control the valve's closing mechanism and are the first items to inspect.

Question 73: On an irrigation design plan, a symbol shows a simple circle with a single dot in the center, connected to a lateral line. What does this symbol most commonly represent?

An electric remote control valve
A pop-up sprinkler head (Correct answer)
A backflow prevention device
A quick coupler valve

Correct answer: A pop-up sprinkler head

While symbols can vary and a legend should always be consulted, a circle with a dot in the middle is a widely recognized and common symbol for a sprinkler head on an irrigation blueprint. Valves, backflow devices, and other components have their own distinct, different symbols.

Question 74: What is the maximum allowable soil moisture depletion generally recommended before irrigating cool-season turfgrass?

50% of plant-available water (Correct answer)
75% of plant-available water
10% of plant-available water
25% of plant-available water

Correct answer: 50% of plant-available water

Irrigating before soil moisture depletion exceeds 50% of plant-available water prevents turf stress while allowing efficient deep watering.

Question 75: A water audit yields a distribution uniformity of 0.62. This result indicates the system is:

Poor and should be improved (Correct answer)
Good and within industry standards
Perfect at 100% efficiency
Excellent and needs no changes

Correct answer: Poor and should be improved

A DU of 0.62 (62%) is poor; the Irrigation Association recommends a minimum DU of 0.75 for turfgrass systems.

Question 76: What does the crop coefficient (Kc) represent in irrigation scheduling?

The number of irrigation cycles per week
The ratio of a specific plant's water use to reference ET (ETo) (Correct answer)
The cost of irrigating a specific crop
Plant height relative to turf

Correct answer: The ratio of a specific plant's water use to reference ET (ETo)

The crop coefficient (Kc) is the ratio of a specific plant's actual ET to the reference ET, used to adjust irrigation amounts for different species.

Question 77: Which metric measures how uniformly an irrigation system applies water across a zone?

Flow rate (GPM)
Distribution uniformity (DU) (Correct answer)
Static pressure
Dynamic pressure

Correct answer: Distribution uniformity (DU)

Distribution uniformity (DU) measures how evenly water is applied across an irrigation zone, calculated from catch-can data.

Question 78: What is the formula for calculating precipitation rate in inches per hour?

Flow rate (GPM) ÷ area (sq ft)
Pressure (PSI) × run time
Gallons used ÷ minutes run
96.25 × GPM ÷ area (sq ft) (Correct answer)

Correct answer: 96.25 × GPM ÷ area (sq ft)

Precipitation rate (in/hr) = 96.25 × GPM ÷ area in square feet, converting flow to an application depth.

Question 79: When installing pop-up spray heads in a lawn area, the top of the sprinkler body should be set:

At the same elevation as the top of the threaded riser
Flush with or slightly below finished grade (approximately 1/4 inch) (Correct answer)
1 inch above finished grade to maximize throw distance
2 inches above finished grade to clear grass interference

Correct answer: Flush with or slightly below finished grade (approximately 1/4 inch)

Pop-up heads installed flush with or just below finished grade avoid damage from mowers and foot traffic while still allowing the pop-up stem to extend fully during operation for proper coverage.

Question 80: An irrigation technician measures 28 VAC at the controller's zone terminal but only 18 VAC at the solenoid in the field. What is the most likely cause?

The controller is set to a low-voltage mode
The solenoid is drawing too much current
Excessive voltage drop due to long wire runs or undersized wire (Correct answer)
The transformer is failing

Correct answer: Excessive voltage drop due to long wire runs or undersized wire

A 10 VAC drop between the controller and the field solenoid indicates excessive voltage drop in the field wiring. This is typically caused by wire runs that are too long for the gauge of wire used, poor splice connections, or corroded wire.

Question 81: A residential irrigation system plan specifies a Pressure Vacuum Breaker (PVB) for backflow prevention. Which of the following is a mandatory installation requirement for this device?

It should be the same size as the mainline pipe, regardless of flow rate.
Annual testing by a certified technician is recommended but not required.
It can be installed in a below-grade valve box for aesthetic purposes.
It must be installed at least 12 inches above the highest outlet in the irrigation system. (Correct answer)

Correct answer: It must be installed at least 12 inches above the highest outlet in the irrigation system.

Pressure Vacuum Breakers (PVBs) are designed to prevent back-siphonage and must be installed at a minimum elevation of 12 inches above the highest sprinkler head or outlet they serve. This elevation is critical for the air inlet valve to function correctly and protect the potable water supply.

Question 82: A property has distinct watering needs: turfgrass zones that need to water three days a week, shrub drip zones that require daily watering, and a newly seeded area that must be watered multiple times per day. Which controller feature is essential to manage these diverse schedules?

A high number of available station terminals
A rain sensor bypass switch
Multiple independent programs (e.g., A, B, C) (Correct answer)
Non-volatile memory

Correct answer: Multiple independent programs (e.g., A, B, C)

Multiple independent programs (often labeled A, B, C, etc.) allow a user to assign different groups of stations to completely separate schedules, with their own unique start times, run times, and days to water. This is the correct way to manage zones with different watering requirements.

Question 83: What is the primary advantage of pressure-compensating (PC) drip emitters over standard drip emitters?

They can be buried at any depth without affecting output
They are less expensive to manufacture and install
They deliver a consistent flow rate across a wide range of inlet pressures (Correct answer)
They require no inline filtration to function properly

Correct answer: They deliver a consistent flow rate across a wide range of inlet pressures

PC emitters use an internal diaphragm or elastomeric disc to maintain a nearly constant output (typically ±10%) across a broad pressure range (usually 10–50 psi), ensuring uniform application even on sloped terrain or long lateral runs where pressure varies.

Question 84: When documenting an irrigation system warranty, which information should be included?

Installation date, component warranty periods, maintenance requirements, system specifications, and conditions that void the warranty (Correct answer)
Only the contractor's contact information
Only the date of installation
Only a list of parts used

Correct answer: Installation date, component warranty periods, maintenance requirements, system specifications, and conditions that void the warranty

A comprehensive warranty document should include the installation date, warranty duration for different components, required maintenance schedule (that the owner must follow to keep the warranty valid), system specifications, and any conditions that would void the warranty.

Question 85: A rain sensor has been installed but the system still runs during and after rain events. What should the technician troubleshoot?

The sprinkler head nozzles
The water pressure
The sensor connection to the controller — verify it is wired to the sensor terminals and the controller's rain sensor bypass switch is in the 'active' position (Correct answer)
The pipe sizing

Correct answer: The sensor connection to the controller — verify it is wired to the sensor terminals and the controller's rain sensor bypass switch is in the 'active' position

If the rain sensor is not overriding the controller, check: (1) that the sensor is properly wired to the controller's sensor terminals, (2) that the controller's sensor bypass switch is set to 'active' (not 'bypass'), and (3) that the sensor itself is functioning (test by pressing the spindles manually).

Question 86: What is the importance of programming an irrigation system controller?

To improve the aesthetics of the system
To minimize water consumption
To automate irrigation schedules (Correct answer)
To monitor water temperature

Correct answer: To automate irrigation schedules

Programming an irrigation system controller is vital because it enables the automation of watering schedules. This means the system can be set to water at specific times and durations without manual intervention, ensuring consistent and efficient irrigation tailored to the landscape's needs.

Question 87: When laying out sprinkler heads for a turf zone, what is the industry best practice for ensuring uniform water distribution and avoiding dry spots?

Placing sprinklers in a triangular pattern only.
Arranging sprinklers to achieve head-to-head coverage. (Correct answer)
Spacing heads at the maximum spray radius listed by the manufacturer.
Mixing different types of sprinkler heads (rotors and sprays) in the same zone.

Correct answer: Arranging sprinklers to achieve head-to-head coverage.

Head-to-head coverage, where the spray from one sprinkler head reaches the adjacent sprinkler head, is the industry standard for achieving the most uniform water distribution across an irrigation zone. This overlap compensates for variations in spray patterns and wind, preventing dry spots between heads.

Question 88: What is the primary purpose of thrust blocks at mainline fitting locations during irrigation installation?

To insulate fittings from soil temperature fluctuations
To resist hydraulic thrust forces at bends, tees, and end caps under pressure (Correct answer)
To prevent soil contamination from entering the fitting joints
To support pipe weight in sandy or unstable soils

Correct answer: To resist hydraulic thrust forces at bends, tees, and end caps under pressure

Thrust blocks are concrete pads or mechanical restraints installed at changes in direction, tees, and end caps to counteract the hydraulic thrust forces generated by water pressure, which would otherwise push fittings apart and cause system failures.

Question 89: A customer asks the technician to add three new sprinkler heads to an existing zone. Before doing so, the technician should first verify that:

The zone's existing flow capacity (GPM) and pipe sizing can support the additional heads without exceeding the water supply's capacity or causing excessive velocity (Correct answer)
The rain sensor is compatible with additional heads
The controller has enough programs available
The new heads are the same color as the existing ones

Correct answer: The zone's existing flow capacity (GPM) and pipe sizing can support the additional heads without exceeding the water supply's capacity or causing excessive velocity

Adding heads increases the zone's flow demand. The technician must verify that the water supply can handle the additional GPM, that the pipe is sized for the increased flow (velocity below 5 fps), and that pressure will remain adequate at all heads including the new ones.

Question 90: Heat stress in outdoor workers performing irrigation installation or maintenance is best prevented by:

Drinking only caffeinated beverages to stay alert
Working as fast as possible to minimize sun exposure
Regular hydration, scheduled rest breaks in shade, appropriate clothing, acclimatization, and recognizing early symptoms of heat illness (Correct answer)
Working without breaks to finish before the hottest part of the day

Correct answer: Regular hydration, scheduled rest breaks in shade, appropriate clothing, acclimatization, and recognizing early symptoms of heat illness

Heat-related illness is a serious risk for outdoor irrigation workers. Prevention includes drinking water before feeling thirsty (16-32 oz per hour), taking regular shade breaks (per OSHA guidelines), wearing light-colored loose clothing, gradually acclimatizing to heat, and watching for symptoms in yourself and coworkers.

Question 91: Which wire gauge is most appropriate when extending an irrigation control wire run beyond 500 feet to prevent excessive voltage drop?

14 AWG (Correct answer)
22 AWG
20 AWG
18 AWG

Correct answer: 14 AWG

As wire runs increase beyond 500 feet, resistance accumulates and reduces voltage at the solenoid. Stepping up to 14 AWG (lower gauge number = thicker wire = less resistance per foot) compensates for this drop and ensures adequate voltage reaches the valve to open reliably.

Question 92: If reference ET = 0.25 inches and the zone precipitation rate = 1.5 in/hr, what run time is needed?

5 minutes
15 minutes
25 minutes
10 minutes (Correct answer)

Correct answer: 10 minutes

Run time = (ET ÷ precipitation rate) × 60 = (0.25 ÷ 1.5) × 60 = 10 minutes.

Question 93: After a zone turns off, the sprinkler heads continue to weep or dribble a small but constant amount of water. The valve box itself is dry. What is the most likely cause of this problem?

A small piece of debris is preventing the valve's diaphragm from sealing completely. (Correct answer)
The mainline pressure is too high, forcing water past the valve seal.
The solenoid coil has failed and is stuck partially open.
The controller is sending a low, residual voltage to the solenoid.

Correct answer: A small piece of debris is preventing the valve's diaphragm from sealing completely.

A constant weep or leak through the heads when a zone is off is typically caused by a small particle of dirt, sand, or PVC shaving caught between the diaphragm and the valve seat. This prevents the diaphragm from creating a complete, watertight seal, allowing water to pass through. [27, 37, 39]

Question 94: What is a 'program' in the context of a multi-program irrigation controller?

An independent watering schedule with its own set of assigned zones, run times, start times, and watering days (Correct answer)
A software update for the controller
A remote access application for smartphones
The controller's operating manual

Correct answer: An independent watering schedule with its own set of assigned zones, run times, start times, and watering days

A program (typically labeled A, B, C on the controller) is an independent watering schedule. Different zones can be assigned to different programs with separate watering days and start times, allowing turf, shrubs, and drip zones to operate on different schedules.

Question 95: A two-wire decoder irrigation control system differs from a conventional multi-wire system in that it:

Requires a separate wire pair for each zone valve
Cannot accommodate more than 12 zones
Uses only two wires to communicate with and power all field decoders and valves (Correct answer)
Does not require a grounding connection

Correct answer: Uses only two wires to communicate with and power all field decoders and valves

A two-wire decoder system uses a single pair of wires (plus a ground) to communicate with and power all field-mounted decoders. Each decoder has a unique address and activates its associated valve when signaled by the controller, greatly reducing wiring requirements.

Question 96: What is a 'water budget' in irrigation controller programming?

A seasonal percentage adjustment to run times based on ET (Correct answer)
The annual cost of water
A maximum allowable daily run time
Total gallons stored in the system

Correct answer: A seasonal percentage adjustment to run times based on ET

A water budget is a percentage adjustment applied to controller run times to match seasonal evapotranspiration needs.

Question 97: A client's irrigation system is causing a fine mist to come from the spray heads, leading to poor water distribution and significant waste from wind drift. Which of the following is the MOST likely cause of this issue?

High water pressure (Correct answer)
Low water pressure
A partially closed master valve
Clogged sprinkler nozzles

Correct answer: High water pressure

High water pressure is a common cause of misting or fogging from spray heads. This occurs when the pressure exceeds the manufacturer's recommended operating range, causing the water to atomize. Low pressure would result in a weak spray and reduced radius, while clogged nozzles would typically create an irregular or blocked pattern.

Question 98: A smart controller uses evapotranspiration (ET) data to adjust irrigation schedules. ET-based controllers primarily calculate water needs based on:

Soil moisture sensor readings
Weather parameters including temperature, humidity, wind, and solar radiation (Correct answer)
Historical rainfall data only
Flow sensor readings from each zone

Correct answer: Weather parameters including temperature, humidity, wind, and solar radiation

ET-based smart controllers use weather parameters — temperature, humidity, wind speed, and solar radiation — to calculate the evapotranspiration rate and adjust irrigation run times accordingly. This allows the controller to apply only the amount of water the landscape has lost.

Question 99: A pump is rated at 50 GPM at 40 PSI TDH (Total Dynamic Head). What does TDH include?

The static pressure at the pump inlet only
Only the elevation the pump must lift water
Only the friction loss in the piping
The sum of elevation lift, friction loss, and required operating pressure at the discharge point (Correct answer)

Correct answer: The sum of elevation lift, friction loss, and required operating pressure at the discharge point

Total Dynamic Head (TDH) includes all the components the pump must overcome: the vertical lift (elevation difference), all friction losses in piping and fittings, and the operating pressure required at the most remote point of discharge (sprinkler head or emitter).

Question 100: What is the function of a filter (screen or disc type) in a drip irrigation system?

To remove particulate matter that could clog the small orifices in drip emitters (Correct answer)
To prevent backflow into the water supply
To add fertilizer to the water
To reduce water pressure for emitters

Correct answer: To remove particulate matter that could clog the small orifices in drip emitters

Filters in drip systems remove sand, sediment, algae, and other particles that would clog the tiny orifices in drip emitters (typically 0.5-1.0mm). Screen filters and disc filters are the most common types, with mesh ratings matched to the emitter orifice size.

Question 101: A controller is described as having 'non-volatile memory.' This means:

The controller uses cloud-based storage
The memory must be reset after each power outage
The memory can only store one program at a time
Programming is retained even if power is lost (Correct answer)

Correct answer: Programming is retained even if power is lost

Non-volatile memory retains all programmed schedules, station run times, and settings even during power outages. When power is restored, the controller resumes normal operation without reprogramming.

Question 102: What is a common cause of low water pressure in an irrigation system?

Excessive water pressure
Clogged filters, pipe leaks, or valve issues (Correct answer)
Improper use of sensors
Water source contamination

Correct answer: Clogged filters, pipe leaks, or valve issues

Low water pressure in an irrigation system is commonly caused by obstructions or breaches in the system. Clogged filters restrict water flow, leaks allow water to escape, and malfunctioning valves can impede pressure, all leading to reduced output at the sprinklers or emitters.

Question 103: The effective root depth of cool-season turfgrass used for irrigation scheduling is typically:

12 to 18 inches
24 to 36 inches
4 to 6 inches (Correct answer)
1 to 2 inches

Correct answer: 4 to 6 inches

Cool-season turfgrasses such as Kentucky bluegrass and tall fescue have active root zones of approximately 4 to 6 inches under typical managed conditions.

Question 104: When pressure-testing a newly installed irrigation mainline, which safety precaution is most important?

Running the test at twice the system's design operating pressure to verify strength
Standing clear of end caps, fittings, and couplings while the system is under pressure (Correct answer)
Ensuring all zone valves are fully open to equalize pressure across the system
Leaving air in the line to cushion pressure spikes during the test

Correct answer: Standing clear of end caps, fittings, and couplings while the system is under pressure

Fittings, end caps, and recently glued joints can fail under test pressure and become dangerous projectiles. Technicians must stand clear of these points and never lean over pressurized components during a hydrostatic or operational pressure test.

Question 105: When working near overhead power lines during irrigation installation, OSHA requires maintaining a minimum clearance distance of:

2 feet
5 feet
No minimum distance is specified
10 feet for lines under 50kV, with greater distances for higher voltages (Correct answer)

Correct answer: 10 feet for lines under 50kV, with greater distances for higher voltages

OSHA requires a minimum 10-foot clearance from overhead power lines carrying up to 50kV. Higher voltage lines require greater distances. This applies to all equipment, materials, and workers — including raised pipe, trencher arms, and hand tools.

Question 106: Which US organization offers the Certified Irrigation Auditor (CIA) credential?

EPA
NFPA
OSHA
Irrigation Association (IA) (Correct answer)

Correct answer: Irrigation Association (IA)

The Irrigation Association (IA) administers the Certified Irrigation Auditor program, setting national standards for irrigation auditing.

Question 107: A 2-wire decoder-based irrigation controller differs from a conventional multi-wire controller primarily because:

Each solenoid valve is assigned a unique address and all valves share a single two-wire communication path (Correct answer)
It cannot support more than 12 zones due to signal degradation
Decoder systems require a separate controller module for each irrigation zone
It uses AC power at each decoder instead of low-voltage DC signals

Correct answer: Each solenoid valve is assigned a unique address and all valves share a single two-wire communication path

In a 2-wire decoder system, all valves connect to a single two-conductor cable, and each decoder receives a unique digital address. The controller sends addressed signals along the shared path to activate specific valves, greatly reducing wiring complexity on large systems.

Question 108: What does the term 'inrush current' refer to in the context of irrigation solenoid valves?

The current required to hold the valve open during normal operation
The electrical current caused by water hammer
The higher initial current draw when the solenoid is first energized to pull the plunger into the coil (Correct answer)
The current that flows through the common wire at all times

Correct answer: The higher initial current draw when the solenoid is first energized to pull the plunger into the coil

Inrush current is the momentary higher current draw (typically 2-3 times the holding current) that occurs when a solenoid is first energized. This higher current is needed to overcome the spring force and pull the plunger into the coil. Once the plunger seats, the current drops to the lower holding value.

Question 109: When using a cycle-and-soak programming technique on a controller, the primary goal is to:

Eliminate the need for a rain sensor by breaking cycles into smaller increments
Allow water to infiltrate before applying more, preventing runoff on sloped or clay soils (Correct answer)
Reduce the total volume of water applied to each zone
Ensure each zone receives water at exactly the same rate

Correct answer: Allow water to infiltrate before applying more, preventing runoff on sloped or clay soils

Cycle-and-soak splits a zone's total run time into multiple shorter cycles separated by soak periods, giving water time to infiltrate and preventing surface runoff — especially important on slopes or compacted soils with slow infiltration rates.

Question 110: A controller has a 'pump start relay' output terminal. What is the purpose of this feature?

To send a low-voltage signal to a pump start relay, which then activates the pump's high-voltage power supply when any irrigation zone is running (Correct answer)
To test the pump for maintenance
To directly power the pump motor
To regulate the pump's speed

Correct answer: To send a low-voltage signal to a pump start relay, which then activates the pump's high-voltage power supply when any irrigation zone is running

The pump start relay terminal provides a 24 VAC signal to a pump start relay whenever any zone is active. The relay, in turn, switches the pump's high-voltage power (120/240 VAC). This allows the low-voltage controller to safely control a high-voltage pump motor.

Question 111: When scheduling irrigation for a newly installed turf lawn (sod or seed), the watering frequency should initially be:

Once per week with deep watering
The same as an established lawn
Multiple times per day with short run times to keep the surface consistently moist until roots establish (Correct answer)
Only when visible wilting occurs

Correct answer: Multiple times per day with short run times to keep the surface consistently moist until roots establish

New turf — whether sod or seed — requires frequent, light watering (2-4 times daily for seed, 1-2 times daily for sod) to keep the surface and root zone consistently moist. Deep, infrequent watering is appropriate only after roots have established (typically 3-6 weeks).

Question 112: Field capacity is defined as the soil moisture level that remains after:

The permanent wilting point is reached
The soil is fully saturated by heavy rain
Excess water has drained away by gravity (Correct answer)
Plants have absorbed all usable water

Correct answer: Excess water has drained away by gravity

Field capacity is the water content remaining in soil 24–48 hours after saturation, once gravitational drainage has stopped.

Question 113: What is the relationship between water velocity, pipe diameter, and flow rate as described by the continuity equation?

Flow rate only depends on pressure, not pipe size
Larger pipes always have higher velocity
Velocity is unrelated to pipe diameter
Flow rate equals the cross-sectional area of the pipe multiplied by the water velocity — so for a given flow rate, smaller pipes have higher velocity (Correct answer)

Correct answer: Flow rate equals the cross-sectional area of the pipe multiplied by the water velocity — so for a given flow rate, smaller pipes have higher velocity

The continuity equation (Q = A x V) states that flow rate equals pipe area times velocity. For a constant flow rate, reducing pipe diameter increases velocity (and vice versa). This relationship governs pipe sizing — pipes must be large enough to keep velocity below 5 fps.

Question 114: What wire gauge is the industry standard for direct-burial irrigation control wiring between a residential controller and solenoid valves?

18 AWG (Correct answer)
10 AWG
22 AWG
14 AWG

Correct answer: 18 AWG

18 AWG UL-listed direct-burial wire is the accepted standard for residential irrigation control circuits, providing sufficient conductivity for 24VAC solenoid valve signals over the distances typically encountered in residential installations.

Question 115: What is drip irrigation?

Flooding the entire area with water
Watering plants manually with a hose
Watering plants through overhead sprinklers
Water delivered directly to plant roots through tubes and emitters (Correct answer)

Correct answer: Water delivered directly to plant roots through tubes and emitters

Drip irrigation is a highly efficient watering method where water is delivered slowly and directly to the plant roots. This is achieved through a network of tubes and emitters placed near the base of each plant. By minimizing evaporation and runoff, drip irrigation conserves water and ensures precise delivery, promoting healthier plant growth while reducing water waste.

Question 116: What is the purpose of a 'rain delay' feature on an irrigation controller?

Reduces run times by 50% during rain events
Permanently disables the controller during rainy months
Suspends irrigation for a user-selected number of days, then automatically resumes normal scheduling (Correct answer)
Activates the rain sensor override

Correct answer: Suspends irrigation for a user-selected number of days, then automatically resumes normal scheduling

The rain delay feature temporarily suspends all programmed irrigation for a specified number of days (typically 1-7 days) after a rain event. After the delay period expires, the controller automatically resumes its normal watering schedule without reprogramming.

Question 117: When transitioning from PVC mainline pipe to PE lateral tubing, what type of fitting is used?

A threaded adapter from PVC to a barbed insert fitting for PE (Correct answer)
A compression fitting designed for PVC
A solvent-cemented coupling
No fitting is needed — they can be pushed together

Correct answer: A threaded adapter from PVC to a barbed insert fitting for PE

The transition from PVC to PE requires a threaded PVC female adapter cemented to the PVC pipe, then a barbed insert male adapter threaded into it, onto which the PE tubing is pushed and clamped. This provides a secure, leak-free transition between the two materials.

Question 118: The National Electrical Code classifies irrigation controller wiring (24 VAC field wiring) as:

Unclassified — no code requirements apply
Class 1, requiring conduit at all times
Class 2, low-voltage wiring that can be directly buried (Correct answer)
Class 3, requiring GFCI protection

Correct answer: Class 2, low-voltage wiring that can be directly buried

Irrigation control wiring (24 VAC) is classified as Class 2 low-voltage wiring under the NEC. Class 2 circuits have inherent energy limitations that make them safe for direct burial without conduit, though local codes may impose additional requirements.

Question 119: When a technician encounters a gas line while hand digging near a utility mark, the correct action is to:

Cover it up and continue the installation in a different area
Move the gas line to a new location
Continue digging carefully around it
Stop work immediately, do not touch the line, and contact the utility company (Correct answer)

Correct answer: Stop work immediately, do not touch the line, and contact the utility company

If a gas line is exposed or suspected during excavation, the technician must stop work immediately, avoid any contact with the line, keep all personnel away from the area, and contact the gas utility company. Damaging a gas line can cause explosions, fires, and fatalities.

Question 120: When laying out sprinkler head locations for a rectangular lawn area, the preferred spacing pattern for maximum uniformity is:

Random placement
Single row down the center
Triangular (equilateral) spacing pattern (Correct answer)
Placing all heads on one side of the area

Correct answer: Triangular (equilateral) spacing pattern

Triangular (equilateral) spacing provides the most uniform water distribution because each head overlaps coverage from multiple adjacent heads. In this pattern, rows are offset so heads are staggered rather than directly across from each other.

Question 121: Plant Available Water (PAW) is correctly calculated as:

Field capacity minus permanent wilting point (Correct answer)
Saturation minus field capacity
Irrigation depth minus evaporation losses
Total precipitation minus surface runoff

Correct answer: Field capacity minus permanent wilting point

PAW is the range of soil moisture between field capacity and permanent wilting point that plant roots can actually extract and use.

Question 122: During a routine maintenance visit, a technician notices that several spray heads on a zone are producing a fine mist rather than a defined spray pattern. This indicates:

The system is working correctly
Operating pressure at the heads is too high, causing misting that wastes water through wind drift and evaporation (Correct answer)
The zone valve is partially closed
The heads need to be raised higher

Correct answer: Operating pressure at the heads is too high, causing misting that wastes water through wind drift and evaporation

Misting from spray heads indicates excessive pressure, which breaks the water stream into tiny droplets susceptible to wind drift and evaporation. Spray heads typically need 30 PSI — pressures above 40 PSI cause significant misting. Pressure regulation is the solution.

Question 123: What is the purpose of installing a valve box (rectangular green or purple lid) over each zone valve or valve manifold?

To increase water pressure at the valve
To provide access for maintenance, repair, and manual operation while protecting the valve and connections from damage and soil intrusion (Correct answer)
To prevent freezing of the valve
To hide the valve for aesthetic purposes only

Correct answer: To provide access for maintenance, repair, and manual operation while protecting the valve and connections from damage and soil intrusion

Valve boxes provide a removable access point to buried valves and manifolds, allowing technicians to maintain, repair, or manually operate valves without excavation. They also protect valve components from soil compaction, root intrusion, and accidental damage.

Question 124: Which soil moisture sensor type measures moisture by analyzing electromagnetic wave propagation through the soil?

TDR/FDR sensor (Correct answer)
Tensiometer
Granular matrix sensor
Neutron probe

Correct answer: TDR/FDR sensor

Time Domain Reflectometry (TDR) and Frequency Domain Reflectometry (FDR) sensors determine volumetric water content by measuring how electromagnetic signals travel through soil.

Question 125: What is the first step when troubleshooting an irrigation system that is not turning on?

Check the power supply (Correct answer)
Check the weather conditions
Check for water leaks
Check the pipes for clogs

Correct answer: Check the power supply

If an irrigation system is not turning on, the very first step in troubleshooting should always be to verify the power supply. This ensures the controller and other electrical components are receiving power, as many issues can stem from a simple tripped breaker or unplugged unit.

Certified Irrigation Technician (CIT) Exam

The CIT certification validates the skills of irrigation technicians in installing, maintaining, and repairing irrigation systems.

125

Questions

150 min

Time Limit

70%

To Pass

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