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back flow test practice test. Questions with answers, Exams of Advanced Education

Cheyney University of PennsylvaniaAdvanced Education

back flow test practice test. Questions with answers

Typology: Exams

2025/2026

Available from 05/07/2026

tizian-mwangi
tizian-mwangi 🇺🇸

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back flow test practice test. Questions with
answers
1. what is the difference between check valve 1 and check valve 2
on a double
check valve assembly:
the two check valves operate the same
2.
in a
perfect vacuum, water can be drawn up in a column
feet:
33.9
3. which of the following is considered to be a chemical
contaminant?: arsenic
4.
which of the following is considered to be a biological health
hazard:
giardia
5.
what type of assembly has two internally spring loaded check,
two shut-off
valves, and four test cocks?: double check valve
6. air gap is the when directly connecting
potable water supply lines to sewerage systems or to radioactive
sources?: most suitable protection
7. a bypass of a backflow prevention assemble may be permitted
only if the assembly in the bypass:: is the same type
8. what federal law made water purveyors responsible for water
quality all the
way into consumers' homes or businesses?: safe drinking
water act amendment of 1986
9.
if a column of water is exerting a pressure of 50 psi, how high
must the water be inside the column?:
115.5
pf3
pf4
pf5
pf8

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Download back flow test practice test. Questions with answers and more Exams Advanced Education in PDF only on Docsity!

1 /

back flow test practice test. Questions with

answers

  1. what is the difference between check valve 1 and check valve 2 on a double check valve assembly: the two check valves operate the same
  2. in a perfect vacuum, water can be drawn up in a column feet: 33.
  3. which of the following is considered to be a chemical contaminant?: arsenic
  4. which of the following is considered to be a biological health hazard: giardia
  5. what type of assembly has two internally spring loaded check, two shut-off valves, and four test cocks?: double check valve
  6. air gap is the when directly connecting potable water supply lines to sewerage systems or to radioactive sources?: most suitable protection
  7. a bypass of a backflow prevention assemble may be permitted only if the assembly in the bypass:: is the same type
  8. what federal law made water purveyors responsible for water quality all the way into consumers' homes or businesses?: safe drinking water act amendment of 1986
  9. if a column of water is exerting a pressure of 50 psi, how high must the water be inside the column?: 115.

2 /

  1. as the velocity of water increases, pressure:: decreases
  2. atmospheric pressure at sea level is psi: 14.
  3. a water supply other than the water purveyor's approved supply, that is on or available to the premises is called a: auxiliary water supply
  4. how can a backsiphonage action be broken: air gap
  5. what single difficult to regulate item is most commonly associated with cross connections, specifically through backsiphonage?: garden house
  6. the appropriate height fo an air gap is: twice the diameter of the pipe above the flood rim of vessel, minimum of 1 inch
  7. while testing check balbe #1 on a DC, water recedes from the tuve attached to test cock #3. The gauge should be moved to the centerline of the assembly and the static pressure drop across the no. 1 check should be recorded. What other information should be recorded.: check valve #2 is leaking and shutott valve #2 is leaking
  8. at what point is the relief valve in an RP required to open: 2. psid
  9. what is the minimum spring tension recommended on the # check valve in an RPZ: 3 psi greater than the tension on the relief valve.
  10. according to the USC, what is the correct height for installing an RPZ: 12 inches above grade, but no more than 36 inches
  11. what is the correct height to install a PVB: 12 inches above the highest downstream point.

4 /

  1. should a customer refuse to install a backlow prevention device at a service connection where a potential health hazard exits, the water purveyor should have the authority to:: discontinue water service
  2. the condition where undersized water pipes carry water under high velocity and may cause a backsipohonage is referred to as the: venturi ettect
  3. what is the purpose of the 3.0 psi buffer in an RPZ when check valves in other assemblies only require a 1.0 psi static pressure drop across them: to minimize the ettects of small fluctuations in line pressure se not to cause the ditterential pressure relief valve to discharge.
  4. which of the following markings is not required for backflow prevention assemblies: minimum working water pressure for proper operation
  5. the best place to install a reduced pressure backflow prevention device is;: in an accessible location above grade
  6. what protection is equivalent to or better than an RP: approved air-gap separation
  7. when should an RP device be tested: at least annually, after installation, and after repairs
  8. why do you open then close the test kit low bleed valve before determining the pressure differential across an RP check valve #1: reestablish "setup pressure"
  9. when testing a reduced pressure zone backflow preventer, bleed valves should be opened in which order: low then high

5 /

  1. what type of gauge is used to measure the pressure across check valves in RP's, DC's, and PVB's: ditterential
  2. when setting up an RP for testing you notice that the gauge dropped to the low end of the scale and that the relief valve began discharging continuously when the no. 2 shutoff valve was closed. what is the probable cause: leaking #1 check valve
  3. if you observe the relief valve of an RPZ spitting water, what would be the suspected cause?: line pressure fluctuating.
  4. You approach an RP that is dripping. Your first move is to close the no. 2 shutoff valve at which time the relief valve stops dripping. what does this indicate: failing #2 check valve, under backpressure
  5. you approach an RP that is dripping and the customer is currently using water. You close the no. 2 shutoff valve and the relief valve continues to leak. what does this indicate?: leaking relief valve
  6. under backpressure conditions, the check valves of a double check valve assembly should be: closed
  7. atmospheric pressure is defined as: the pressure exerted by the weight of the air upon the earth
  8. what would most likely occur, if you switched the spring's on each check valve of an RP assembly: relief valve would discharge continuously
  9. while testing a reduce pressure backflow preventer. the tester has deter-mined that the line pressure is 75 psi. the test

7 / psi or less.: two

  1. the difference between the opening point of the relief valve and the differ- ential across the first check valve should be at least psi to minimize excessive discharges due to pressure fluctuations in the supply line.: three
  2. an appropriate application of a reduced pressure backflow preventer would be to provide adequate protection for what type (degree) of haxard?: high hazard
  3. what are two backflow conditions that may cause a reversal of flow in water lines?: backsiphonage and backpressure
  4. for installations requiring continuous service service lines entering the premises, it is sometimes necessary to install devices.: dual
  5. a vacuum breaker should only be used to protect against .: back-siphonage only
  6. according to usc, what is the correct height to install an atmospheric vacu-um breaker?: 6 inches above the highest downstream point
  7. test kits should be verified for accuracy and, if needed, calibrated how often?: at least once a year
  8. to determine the air inlet opening point on a PVB, the tester must open the:: high side bleed valve
  9. backpressure: a form of backflow due to a vacuum or partial vaccum
  10. reduced pressure principle assembly: a device consisting of two check

8 / valves and a ditterential relief valve located between the two check valves

  1. pressure vacuum breaker: a device having a spring loaded air opening down stream from a single check valve
  2. backsiphonage: a form of backflow due to a vacuum or partial vacuum
  3. air gap: a physical break between a supply pipe and a receiving vessel
  4. atmospheric vacuum breaker: a device consisting of a single check valve and an air opening. device must be installed on the discharge side of the last valve
  5. double check valve device: a device consisting of two internally loaded check valves
  6. cross connection: any actual or potential connection between a public or private potable water system and any other source through which pollution may enter the potable system.