CIT - Certified Irrigation Technician Certified Irrigation Technician System Installation and Layout 1

Question 1

What is the primary purpose of thrust blocks at mainline fitting locations during irrigation installation?

Accepted Answer

To resist hydraulic thrust forces at bends, tees, and end caps under pressure

Answer

To support pipe weight in sandy or unstable soils

Answer

To insulate fittings from soil temperature fluctuations

Answer

To prevent soil contamination from entering the fitting joints

Question 2

When installing pop-up spray heads in a lawn area, the top of the sprinkler body should be set:

Accepted Answer

Flush with or slightly below finished grade (approximately 1/4 inch)

Answer

1 inch above finished grade to maximize throw distance

Answer

2 inches above finished grade to clear grass interference

Answer

At the same elevation as the top of the threaded riser

Question 3

Before installing nozzles and sprinkler heads on newly installed lateral lines, the technician should:

Accepted Answer

Flush the lateral lines to remove pipe shavings, dirt, and debris

Answer

Pressurize the system to full operating pressure to confirm pipe integrity

Answer

Install all heads simultaneously to maintain equal pressure on the line

Answer

Cap all openings until controller programming is complete

Question 4

What wire gauge is the industry standard for direct-burial irrigation control wiring between a residential controller and solenoid valves?

Accepted Answer

18 AWG

Answer

10 AWG

Answer

14 AWG

Answer

22 AWG

Question 5

At what point during mainline installation should a hydrostatic pressure test be performed?

Accepted Answer

Before the trench is backfilled, while all fittings and joints remain visible

Answer

After all sprinkler heads are installed and the system is fully operational

Answer

After the trench is backfilled and soil is compacted to final grade

Answer

Only when a leak is suspected during the first full-system test

Question 6

In irrigation layout, the 'head-to-head coverage' principle requires that:

Accepted Answer

The throw radius of each sprinkler head reaches the location of the adjacent sprinkler head

Answer

Sprinkler heads be installed in matched pairs directly facing each other

Answer

All heads within a zone operate at identical precipitation rates

Answer

Heads be spaced at fixed intervals regardless of their rated throw radius