IA Irrigation Controllers & Automation

Question 1

What is the primary function of an irrigation controller?

Accepted Answer

To automatically open and close valves according to a programmed schedule

Answer

An irrigation controller (timer) operates solenoid valves on a preset schedule, automating the opening and closing of irrigation zones without manual intervention.

Question 2

A rain sensor on an irrigation controller is designed to:

Accepted Answer

Interrupt or delay scheduled irrigation when sufficient rainfall occurs

Answer

Rain sensors interrupt or postpone irrigation when rainfall exceeds a set threshold, preventing unnecessary watering and saving water.

Question 3

A two-wire decoder irrigation system differs from a conventional controller system because:

Accepted Answer

It runs all field wiring from the controller through a single pair of wires to decoder modules at each valve

Answer

Two-wire decoder systems replace multi-conductor cables with a single two-wire path carrying both power and communication signals to individual decoder modules at each valve.

Question 4

Which controller feature allows a user to temporarily increase or decrease all run times by a percentage without reprogramming each zone?

Accepted Answer

Seasonal adjust (water budget) percentage

Answer

The seasonal adjust or water budget feature multiplies all station run times by a set percentage, allowing quick seasonal changes without editing each station individually.

Question 5

A master valve (MV) in an irrigation system is installed:

Accepted Answer

On the mainline upstream of all zone valves, and opens only when a station is active

Answer

The master valve is a normally-closed valve on the mainline that the controller opens whenever a station runs; it prevents water waste from valve leaks when the system is off.

IA - Irrigation Association Certification Practice Test

IA - Irrigation Association Certification Practice Test

IA Irrigation Controllers & Automation