1. A 1/4" diameter potable water deliver shall have at the least a _____ air hole separation
between the deliver pipe and the flood stage rim - ANS-1 inch
2. a 2 inch atmospheric vacuum breaker set up on a 2 inch water deliver to a tank need to
be at least _______ above the flood degree rim of the tank - ANS-six inches
3. a take a look at valve in an permitted BF meeting should be drip tight while? - ANS-The
assembly is situation to any backflow
4. a chemically handled boiler device might require what sort of backflow protection on the
potable water make up line? - ANS-RP
5. A differential stress gauge is used in the trying out of? - ANS-Reduced stress and double
take a look at valve assemblies
6. A double check Assembley test and maintenance document shall consist of all the
following accept? - ANS-Differential strain comfort valve discharge reading
7. A double take a look at BFP assembly will defend the potable water deliver from? -
ANS-NON-Health hazard- Backpressure and Back siphonage
8. a leaking check valve may be caused by? - ANS-Dirty or broken check disc, take a look
at seat; broken or broken spring, or guide members putting up
9. a capability backpressure backflow plumbing connection is - ANS-manner water line
10. A stress gauge set up at the lowest of an open tank containing water 10 feet deep, might
suggest what pressure studying? - ANS-four.Three psi (atmospheric strain is .433)
11. A stress of 75 psi would be equal to what ______ head strain? - ANS-173.2 toes ( 1 foot
of head is 2.3 psi) (2.Three x 75= 173 feet)
12. A RP check will imply a leaking variety shutoff valve by way of? - ANS-No trade inside
the differential strain analyzing while checking out the differential pressure relief valve
13. A RP's differential remedy valve operates from the incoming water stress and the water
strain within the? - ANS-quarter between the 2 take a look at valves
14. a small hole in the underground potable water distribution device may additionally -
ANS-permit infection from returned-siphonage backflow
15. a spill resistant vacuum breaker is a modified - ANS-pressure vacuum breaker meeting
16. all of the following ought to create a closed loop piping device except a? - ANS-Pressure
remedy valve
17. an absolute strain of 25 PSIA is equal to - ANS-10 PSIG
18. an absolute vacuum at sea stage can raise a column of water a max distance of -
ANS-33.Nine feet
19. an air gap separation is decided from the opening piping's______ diameter -
ANS-effective
20. An air hole separation is measured from the outlet of the release pipe to the? -
ANS-Flood level rim
21. An atmospheric kind vacuum breaker shall now not be subjected to water pressure for
intervals longer than _______ Hours? - ANS-12
, 22. An atmospheric vacuum breaker is installed to protect in opposition to? -
ANS-BACKSIPHONAGE- Health threat OR Non fitness chance situations
23. An occasional discharge from the relaxation valve of a RP commonly shows? - ANS-The
device is running properly
24. an unprotected pass around a backflow prevention assembly or tool - ANS-is considered
a pass connection and is never accepted
25. Approved Reduced strain precept meeting, refers to 2 shutoff valves, four test cocks,
and? - ANS-2 accepted test valves and a Differential stress relief valve.
26. Backflow may be defined as? - ANS-Backpressure or back siphonage
27. Constant discharge from the comfort valve of a RP usually suggests? - ANS-Leaking #1
take a look at valve
28. fit to be eaten syrup brought right into a water device thru a pass-connection could be an
instance of? - ANS-A non-health risk
29. Every vacuum breaker is designed to? - ANS-save you backsiphonage backflow
30. For containment protection in a non-fitness chance state of affairs, the minimum
protection required shall be? - ANS-Double check backflow prevention assembly
31. How can you stop an occasional discharge of water from the comfort valve of a RP
caused by supply pressure fluctuations? - ANS-By putting in a soft seat take a look at
valve upstream of the assembly
32. How many inches ought to a strain kind vacuum breaker be hooked up mainly
downstream piping? - ANS-12 inches
33. How many inches ought to an Atmospheric vacuum breaker be installed in particular
downstream piping and the very best commencing? - ANS-6 inches
34. How many psi are exerted at the base of a column of water that is toes tall? - ANS-.86
35. If all through the sector check of a RP, the comfort valve fails to open, the in all likelihood
cause is? - ANS-A malfunction of the differential strain relief valve mechanism
36. if no longer marked, the crucial level of a strain vacuum breaker is believed to be the
extent of the? - ANS-backside of the valve body
37. if the air inlet valve of a stress vacuum breaker meeting will now not seat, the -
ANS-supply stress is just too low
38. If the test valve springs are interchanged on a double test valve, the assembly? -
ANS-Will not be adversely suffering from the interchange
39. It is feasible for a great vacuum at sea degree to elevate water in a pipe about? -
ANS-33.Nine or 34 Feet
40. it's far viable to catch up on a leaking range 2 shut off valve at some stage in field test of
a RP by way of attaching a brief bypass hose from? - ANS-primary test cock to variety
four take a look at cock
41. It is needed that the take a look at gauge be examined for accuracy at the least? -
ANS-Annually
42. on an approved pressure vacuum breaker, the shut off valves? - ANS-are positioned at
the inlet and outlet of all assemblies
43. Point of use backflow prevention is described as - ANS-Isolation
44. PSIG is equivalent to - ANS-PSIA minus atmospheric strain
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