CIT - Certified Irrigation Technician System Installation and Layout 2

Question 1

When installing PVC irrigation mainline pipe, the trench depth should be a minimum of:

Accepted Answer

12 inches below grade with proper bedding material

Answer

4 inches below grade

Answer

6 inches below grade

Answer

24 inches below grade

Question 2

A pipe sleeve (conduit) should be installed under hardscape (driveways, sidewalks, patios) during irrigation installation because:

Accepted Answer

It allows future pipe repair or replacement without demolishing the hardscape

Answer

It increases water pressure

Answer

It reduces friction loss in the pipe

Answer

It acts as a secondary containment for leaks

Question 3

When laying out sprinkler head locations for a rectangular lawn area, the preferred spacing pattern for maximum uniformity is:

Accepted Answer

Triangular (equilateral) spacing pattern

Answer

Random placement

Answer

Placing all heads on one side of the area

Answer

Single row down the center

Question 4

What is the purpose of a valve manifold in irrigation system installation?

Accepted Answer

To group multiple zone valves together in one accessible location for easier maintenance and inspection

Answer

To increase system pressure

Answer

To filter water for the entire system

Answer

To connect the system to the water heater

Question 5

When transitioning from PVC mainline pipe to PE lateral tubing, what type of fitting is used?

Accepted Answer

A threaded adapter from PVC to a barbed insert fitting for PE

Answer

A solvent-cemented coupling

Answer

A compression fitting designed for PVC

Answer

No fitting is needed — they can be pushed together

Question 6

During system installation, a thrust block or restrained joint is needed at:

Accepted Answer

Direction changes, dead ends, and tees in pressurized mainline piping where the pipe could push apart

Answer

Every sprinkler head

Answer

Only at the controller location

Answer

Only where the pipe crosses under driveways