CIT - Certified Irrigation Technician Certified Irrigation Technician Electrical Systems and Wiring 1

Question 1

A technician measures 0.5 ohms resistance when testing an irrigation solenoid in the field. What does this reading indicate?

Accepted Answer

The solenoid coil is shorted (a direct short circuit exists in the winding)

Answer

The solenoid coil is functioning normally

Answer

The solenoid coil is open and must be replaced

Answer

The wire run to the solenoid is too long

Question 2

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

Accepted Answer

14 AWG

Answer

18 AWG

Answer

20 AWG

Answer

22 AWG

Question 3

When splicing irrigation control wires underground, which method best prevents water intrusion and corrosion at the connection point?

Accepted Answer

Gel-filled waterproof wire connectors (DBY or DBR type)

Answer

Standard plastic twist-on wire nuts wrapped with electrical tape

Answer

Heat-shrink tubing alone without sealant

Answer

Bare twisted wires laid in a valve box

Question 4

In a two-wire decoder-based irrigation system, what does the single pair of wires running through the field carry?

Accepted Answer

Both power and digital address signals that activate specific decoders

Answer

Only 24 VAC power to all decoders simultaneously

Answer

A separate DC signal for each zone valve

Answer

Only the common (return) path back to the controller

Question 5

An irrigation controller repeatedly blows the 1-amp output fuse immediately after reset. Which field condition is most likely responsible?

Accepted Answer

A direct short circuit on one of the zone wires touching the common wire

Answer

An open circuit caused by a broken wire between the controller and valve

Answer

A solenoid coil with resistance measuring 45 ohms

Answer

Excessive wire length causing high resistance on a long run

Question 6

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

Accepted Answer

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

Answer

To step down 120 VAC utility power to 24 VAC for the solenoids

Answer

To increase the number of zones the controller can operate simultaneously

Answer

To regulate solenoid current to a constant 0.25 amps per zone