Chapter 6 Flashcards
The correct definition of the term “in Rush current” is
The additional current required to actuate a valve solenoid when water pressure is increased.
Wire may be laid in the same trench with pipes
And at the same depth
The primary purpose of having a grounding conductor connected to electrical irrigation controllers is?
To eliminate the possibility of electrical shock
The color code of the equipment grounding wire (conductor) in a residence is _______ or _______?
Green/Bare Copper
What exception to this timing occurs when asphalt roadways are left unsurfaced or surface only with a base line?
Need to wait until all construction traffic has ceased.
The three basic types of sprinkler systems are the spray, rotary and quick-coupling systems. The sprinkler systems that operates by hand labor only and not automatic timers, control valves, etc is the __________?
Quick-Coupling
Gate valves should never be used for zone operating valves because?
Leaking occurs after continual use
What is the limiting factor on the number of remote sprinkler control values which can operate simultaneously from a single controller?
Manufactures Specification
In wiring an electrical solenoid valve, which of the following is not a factor in its operation?
The number of heads in the zone
Low voltage landscape wiring is usually.
Flexible stranded wire, 2- #12 awg
If corrosion in the neutral wire of a remote control valve (RCV) control circuit creates an open circuit __________?
All valves on the side of the break away from the controller will be made inoperative.
Spray heads are _________ sprinklers?
Stationary
Spray heads are popped out of the ground by _________ and spray water in the pattern you select?
Water pressure
____________ move water in a circular manner and throw water longer distances?
Rotary Heads
Rotary heads take and concentrate water into ________ that propel over long distances?
Thin Streams
The two basic types of rotary heads most often used today are______?
Impact and gear drive heads
___________ the placement of groundcover fills space most efficiently?
Alternating
One benefit of mulching newly installed plants is _________________?
Prevents winter heaving of bulbs and ground covers
The only way to improve the drainage of caliche soil is to _______________?
Break through it and remove the impermeable layer
What direction should you face cactus when planting?
North
After the soil has been backfilled, a mounded ring of compacted soil should be formed around the edge of the hole to ___________?
Catch and hold water
Footing for freestanding walls should be installed when other footings are placed and masonry work completed before?
Finish grading is begun
Plants that live at least 3 to 4 years are _________?
Perennials
Caliche soil would be described as _________?
Highly alkaline due to lime content
What is it called when a method is applied to trap and hold any applied water, preventing loss through run-off?
Retainage
What is a tree 15-30 feet high with yellow blooms, low water tolerance and high tolerance to salt in the ground?
Chinese jujube
When is the best season to plant native desert plants?
Coolest
When transplanting a bareroot desert cactus plant, which of the following statements is incorrect?
Allow the roots remain in as much original soil as possible and water immediately after planting
Desert landscapes are easier to maintain than tropical or temperatures landscapes because the dry climate _________?
Discourages many of the insects and diseases.
When pulling PVC pipe through rocky ground during installation, the pipe may be damaged by __________?
Grooving
________________ is how fast our soil is able to absorb water in inches of water per hour?
Permeability rate
When connecting plastic pipe to metal pipe __________?
A plastic adapter with external threads should be used
The two most important factor influencing water pressure at the supply side are _________?
Friction and elevation
Avoid placing pipe so as to cause ______________?
Cross-trenching
Placing parallel in the same trench works well where you can place __________?
A mainline
