1. A control valve downstream a backflow tool might also bring about - ANS-Constant
stress
2. A dual test valve is approved to protect - ANS-Neither again strain or returned siphonage
3. A stress vacuum breaker may be established with a - ANS-Control valve at once
downstream
4. A pressure vacuum breaker will operate satisfactorily beneath consistent strain -
ANS-True
5. A reduced stress principle device ought to be installed - ANS-12" above grade
6. A spill resistant vacuum breaker isn't suitable for - ANS-Back pressure
7. An irrigation machine with any kind of injection tool related to it would be termed as -
ANS-Health chance
8. Any stress, no matter its source, against the hole aspect of the backflow prevention
device, which exceeds the deliver stress against the inlet side of the device is: -
ANS-back stress
9. Backflow within the water distribution machine may be because of - ANS-Back stress
and lower back siphonage
10. Backflow prevention assemblies on excessive risk have to be repaired - ANS-When filed
check consequences show failure
11. How many take a look at cock are on a D.C.A - ANS-4
12. If water hammer is a problem, then a PVB may be used if - ANS-a PVB cannot protect
against water hammer
13. In an irrigation machine, an atmospheric vacuum breaker must be installed____ inches
above the best water outlet - ANS-It can not be established
14. The mechanical prevention of reverse glide, or back siphonage, of non-potable water
from an irrigation machine into the general public water gadget is referred to as -
ANS-again waft prevention
15. What will appear if an PVB is intalled in the wrong path - ANS-Water will escape via the
pinnacle portion of the device
16. Where are the close-off valves placed on an SVB - ANS-Both inlet and outlet side
17. Which lower back drift device is endorse to save you again siphonage - ANS-Spill
resistant vacuum breaker , stress vacuum breaker, double take a look at valve assembly
18. Which back glide tool is recommended for low hazard applications - ANS-Spill-resistant
vacuum breaker, stress vacuum breaker, double take a look at meeting
19. Which again-go with the flow tool is most advocated for structures with fertilizer injectiors
- ANS-Reduced stress precept
20. Which backflow tool can be installed underneath grade ( floor degree ) - ANS-Double
check meeting
21. Which backflow tool may be beneath regular pressure - ANS-PVB, SVB,DCV,RPZ
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