CIT - Certified Irrigation Technician Electrical Systems and Wiring 2

Question 1

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?

Accepted Answer

Excessive voltage drop due to long wire runs or undersized wire

Answer

The transformer is failing

Answer

The solenoid is drawing too much current

Answer

The controller is set to a low-voltage mode

Question 2

What is the standard operating voltage for residential and commercial irrigation solenoid valves in North America?

Accepted Answer

24 VAC

Answer

12 VAC

Answer

120 VAC

Answer

48 VDC

Question 3

When using a multimeter to test an irrigation solenoid, a reading of OL (overload/infinity) on the ohms scale indicates:

Accepted Answer

An open circuit — the solenoid coil is broken

Answer

The solenoid is functioning normally

Answer

A short circuit in the solenoid

Answer

The multimeter battery is dead

Question 4

The common wire (often white) in an irrigation system serves what purpose?

Accepted Answer

It provides the return path for electrical current from all solenoids back to the controller

Answer

It carries the signal to activate specific zones

Answer

It connects to the rain sensor only

Answer

It powers the controller's display panel

Question 5

What type of wire splice connection is recommended for direct burial irrigation applications?

Accepted Answer

Waterproof grease-filled wire connectors (gel-filled)

Answer

Standard wire nuts with electrical tape

Answer

Soldered connections left exposed

Answer

Push-in connectors designed for indoor use

Question 6

A technician is wiring a new controller and notices the transformer has two primary voltage taps: 120V and 240V. The building has 240V service only at the controller location. What should the technician do?

Accepted Answer

Connect the primary wires to the 240V tap to match the building's supply voltage

Answer

Use only the 120V tap and add a step-down transformer

Answer

Connect the 240V supply to the 120V tap for higher solenoid output

Answer

Advise the client that the controller cannot be used with 240V