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CR-21 Landscaping and Irrigation Mock Exam With Correct Answers 2026/2027
1.	What is the primary function of a "Backflow Preventer" in an irrigation system? 
•	A) To increase water pressure for far-reaching sprinklers. 
•	B) To prevent contaminated water from flowing back into the potable water supply. 
•	C) To filter out sand and debris. 
•	D) To regulate the timing of the watering cycle. 
•	Correct Answer: B. This is a critical safety component required by code to protect the public water system from fertilizers or chemicals. 
2.	Which type of soil h...