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C27 Test 1 Questions with correct Answers
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C27 Test 1 Questions with correct Answers
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C27 Test 1How would you get the best, longest-lasting, results from cyclone seeding? - Answer- use sufficient fiber mulch
what is the main reason galvanized pipe or gray [brownline] PVC could be run along the
surface of the ground but NOT white PVC? - Answer- white PVC will become brittle in sunlight
which sprinkler heads throws the most water? - Answer- impact- drive rotary
what is a bushing - Answer- 1" x 1/2" TT
what is a nominal size of drainage pipe? - Answer- * 3"
* 4" * 6"
which is Not a nominal size of drainage pipe? - Answer- * 5"
if a lawn with an electric sprinkler System is Green in one area and Brown in another, the most likely cause is? - Answer- a broken electrical wire
If an automatic sprinkler system won't trun off, the most likely cause is? - Answer- Faulty
solenoid
the death of a patch of Hedera Canariensis would be most likely to have been caused by? - Answer- a broken irrigation head
The symbol below shows a: - Answer- globe valve
If a sprinkler head is misting rather than spraying, what is the most likely cause of the problem? - Answer- too much pressure
An atmospheric vacuum breaker should be installed approximately ____________ above the highest sprinkler head. - Answer- 6" to 12"
if the last head in a system is continuously weeping, the most likely cause is? - Answer- a worn valve washer
How long should you wait before applying static water pressure to a newly made PVC solvent weld? - Answer- 24 hours
The minimum coverage for underground installation of main line PVC is ____________ below finish grade. - Answer- 12"
a sprinkler system has 4 full heads at 11 GPM, 2 half-heads at 6 GPM, and 5 quarter-
heads at 2 GPM. the meter can supply 17 GPM. How many valves are needed for this system? - Answer- 4 valves
why do you need to know the elevation of sprinkler pipes? - Answer- to calculate Pressure loss
if an area immediately around one sprinkler head is Brown (dead) what is the most likely
cause? - Answer- a faulty sprinkler head
after PVC MAIN & LATERAL lines are installed & flushed, they should be tested under constant pressure for? - Answer- MAIN: 6hrs at 125 PSI &
LATERAL: 2hrs at 100 PSI
you have 337 ft of pipe. if it loses 3.03 psi every 100ft, the total Pressure loss will be? - Answer- 3.03psi x 3.37 ft = 10.21 psi
what is the most expensive type of 3/4" PVC pipe? - Answer- Schedule 80
Class 200 PVC Pipe is recommended when.... - Answer- You want to save money on materials
Which backflow preventer is approved for use where irrigation water can be hazardous?
- Answer- reduced pressure backflow preventer
If you put a pump on a water system to increase pressure, where does the atmospheric vacuum breaker go? - Answer- between the pump and the system
If one sprinkler head is 20 ft higher than another, what change in the psi would you expect when going from the upper to the lower head? - Answer- +8.66 psi
According to code, what is the size of the drain line running from a catch basin? - Answer- 4"
According to code, what is the size of the drain plate running from a catch basin? - Answer- 4"
What is the most commonly used type of control valve? - Answer- diaphragm
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