CR-21 Landscaping and Irrigation: Final Exam With Correct Answers 2026/2027 version

CR-21 Landscaping and Irrigation: Final Exam With
Correct Answers 2026/2027 version
1. In an irrigation system, what is "Static Pressure"?

 A) The pressure when all heads are running.

 B) The pressure when no water is moving in the system.

 C) The pressure at the pump outlet only.

 D) The pressure lost due to friction in the pipe.

 Correct Answer: B. Static pressure is measured at the source when the water is
stationary.

2. Which valve is specifically designed to allow air to escape the lines to prevent "Air Pocket"
surges?

 A) Check Valve.

 B) Air Release Valve.

 C) Solenoid Valve.

 D) Gate Valve.

 Correct Answer: B. Air trapped in pipes can cause "water hammer" and burst fittings;
these valves vent that air safely.

3. What is the "C-Value" (or C-Factor) of a pipe?

 A) The cost of the pipe per foot.

 B) The smoothness of the interior of the pipe.

 C) The temperature at which the pipe melts.

 D) The thickness of the pipe wall.

 Correct Answer: B. A higher C-Value means a smoother pipe, resulting in less friction
loss.

4. According to the Arizona Registrar of Contractors (ROC), how long is the warranty period
for workmanship?

 A) 1 year.

 B) 2 years.

 C) 5 years.

 D) 10 years.

 Correct Answer: B. Licensed contractors in Arizona are generally responsible for
workmanship defects for a period of two years.

5. What does a "Multimeter" measure when troubleshooting an irrigation clock?

,  A) Water flow in GPM.

 B) Soil moisture percentage.

 C) Voltage, Current (Amps), and Resistance (Ohms).

 D) The depth of the buried wire.

 Correct Answer: C. It is the essential tool for finding "opens" or "shorts" in the valve
wiring.

6. What is "Elevation Head" loss (or gain)?

 A) Pressure change caused by the height of the water column (0.433 psi per foot).

 B) The cost of lifting heavy rocks.

 C) The speed of the water.

 D) The height of the sprinkler spray.

 Correct Answer: A. If a sprinkler is 10 feet higher than the valve, you lose 4.33 psi
just from gravity.

7. What is the primary sign of a "Short Circuit" in an irrigation solenoid?

 A) The valve stays open forever.

 B) The controller fuse or circuit breaker trips.

 C) The water pressure increases.

 D) The timer runs faster than normal.

 Correct Answer: B. A short creates a path of low resistance, drawing too much
current and blowing the fuse.

8. In Arizona, what is "Caliche"?

 A) A type of decorative desert grass.

 B) A hard, calcium carbonate-bound soil layer that prevents drainage.

 C) A brand of organic fertilizer.

 D) A specific way to prune citrus trees.

 Correct Answer: B. Caliche often acts like concrete and must be broken through to
allow roots to grow and water to drain.

9. Which pipe is stronger: Schedule 40 or Class 200 PVC?

 A) Class 200.

 B) Schedule 40.

 C) They are the same.

 D) It depends on the color of the pipe.

,  Correct Answer: B. Schedule 40 has a thicker wall and is generally more durable than
Class 200, especially in smaller diameters.

10. What is the purpose of a "Thrust Block"?

 A) To keep the irrigation clock from falling.

 B) To prevent underground pipes from moving or separating at turns under high
pressure.

 C) To support the weight of a large boulder.

 D) To increase the reach of a rotor head.

 Correct Answer: B. Thrust blocks are typically concrete pours placed at 90-degree
elbows or tees.

11. What is "Evapotranspiration" (ET)?

 A) The process of water freezing in the winter.

 B) The combined amount of water lost through soil evaporation and plant
transpiration.

 C) The chemical reaction of fertilizer.

 D) The speed of a lawnmower blade.

 Correct Answer: B. ET rates are used to calculate exactly how much water a
landscape needs.

12. What is the "Drip Line" of a tree?

 A) The pipe that runs to the tree.

 B) The area directly under the outer circumference of the tree's canopy.

 C) Where the sap leaks from the trunk.

 D) The depth of the deepest root.

 Correct Answer: B. This is where most feeder roots are located and where emitters
should be placed.

13. Which micronutrient is most commonly deficient in Arizona's alkaline soils, causing yellow
leaves with green veins?

 A) Nitrogen.

 B) Iron.

 C) Calcium.

 D) Magnesium.

 Correct Answer: B. This condition is known as "Iron Chlorosis."

14. What is "Back-Siphonage"?