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Backflow Test
| Question | Answer |
|---|---|
| In accordance with title 17, reports of testing maintenence of backflow devices must be maintained: A. By the owner of the assembly B. For three years by the health agency C. By the tester D. By the Watee Agency for 3 years | C. By the tester |
| When testinf a backflow, the number 2 shutoff must be closed first to: A. Maintain water pressure in the down stream piping B. Prevent backpressure during thentesting of the assembly C. Prevent Backsiphonage during the testing of the assembly D. Prevent | C. Prevent back siphonage during the testing of the assembly |
| Backsiphonage due to an aspirator effect may be caused by: A. A sudden increase in the supply pressure. B. High velocity of flow through a pipe ter C. Water from a high pressured pump against the 2 check of an rp backflow D. A hose attatched to a hosebib | B. High velocity flow of water through a Tee |
| A rp relief valve sense water pressure at 2 spots. One of which is the: A. Outlet of the number 4 testcock B. Outlet of the number 2 check valve C. Inlet of the number 1 check valve D. Atmospheric vent | C. Inlet of the number 1 check valve |
| Backpressure from a low inlet to a plating tank containing toxic solution is properly prevented by: A. A pressure vacuun breaker B. A rp assembly C. An atmospheric vacuum breaker D. A double check valve | B. Rp Assembly |
| During the test of a rp, the test gauge always reports the differential pressure accross A. Check 1 B. Check 2 C. The entire assembly D. The relief valve | A. Check 1 |
| How do you compensate for water continuously running through air vent on PVB? A.Open and close 1 line valve B. Open and close 2 line valve C. Open test cock 1 slowly D. You cannot continue | A. Open and clock 1 line valve |
| When a perfect vaccum at sea level draws water up into a 40 foot pip the pressure in the piep above the water surface is? A. O psi B. 33.9 feet of water C. 14.7 psi D. 29.92 inches of mercury | A. O psi |
| In accordance with title 17, backflow testerd must demonstrate compency in testing to: A. Local health department B. Water supplier or health agency C. American Backflow Prevention Association D. University of California | B. Water supplier or health agency |
| Static pressure is defined as: A. Standing water in an open resevoir B. The weight of a vertical column of water against a closed valve C. The force exerted on a valve face by water flowing through a valve D. The force per unit area exerted by a column of | D. The force per unit area exerted by a column lf water against a closed valve. |
| In accordance with tile 17 maximum clearance above grade for an RP is: A. 36 in B. 42 in C. 12 in D. 24 in | A. 36 inches |
| The basic operating theory of an RP assembly is: A. The principle that water cannot be pressurized B. The water will not flow from a lower pressure to a higher pressure C. By reducing line pressure it automatically helps prevent backflow. D. The 1st check | B. the water will not flow from a lower pressure to a higher pressure |
| There is a continuous discharge from the relief valve of an RP and the drop across number one check is 9.0 PSID, what is the most likely malfunction. A. 1 check valve failed B. Line pressure fluctuating C. Second check fouled D. Fouled relief valve | D. Fouled relief valve |
| When compensating for a leaky number one shut off valve on a PVB, how do you know you have reach proper compensation? A. When water stops running out of the number 2 test cock B. When there is a slight drip at test cock number 2 C. When the gauge drops a | B. When there is a slight drop at test cock number 2 |
| A dual check valve is not: A. Approved B. Inline testable C. Repairable D. Replaceable | B. Inline testable |
| The air inlet valve of an atmospheric vacuum breaker is fully open when the valves water pressure reached ____ psig A. -1 (6.9) B. 0 (0) C. 1 (6.9) D. 1.1 (7.6) | B. 0 |
| A pressure vacuum breaker is not permitted for use with: A. back siphonage B. contaminants C. elevated Downstream piping D. pollutants | C. Elevated Downstream piping |
| SVP is not installed in areas that contain: A. check valves Downstream B. hazardous chemicals C. other vacuum breakers D. toxic fumes | B. Hazardous chemicals |
| The minimum number of resilient seated valves on an SVB is: A. 2 B. 3 C. 4 D. 5 | A. 2 |
| An RP relief valve discharge after closing shut off number to is an indication of a fouled: A. Check 1 B. Check 2 C. Relief valve D. Shut off 2 | A. Check valve 1 |
| When you are flushing the test Cox prior to testing A reduced pressure principle backflow assembly you should always: A. Exercise the relief valve vigorously to make sure it opens correctly B. Slowly open the number to test cock until the relief valve ope | C. Slowly open the number to test cock being careful not to open the relief valve |
| The number one test cock of a pressure type vacuum breaker assembly is located at the: A. Inlet of shut off valve number 1 B. Outlet of shut off valve number 1 C. Outlet of check valve number one D. Inlet of shut off valve number 2 | B. Outlet shut off valve number 1 |
| Hey atmospheric type vacuum breakers check valve closing pressure is ____ psig: A. 0 B. 1 (6.9) C. 2 (14) D. 3 (21) | A. 0 |
| A characteristic of the SVP operation is that the air inlet must seal before the: A. Air admittance valve opens B. Check valve closes C. Check valve opens D. Downstream uses open | B. Check valve opens |
| Hey duplex Gage has ____ hoses. A. 1 B. 2 C. 3 D. 4 | B. 2 |
| The maximum level of protection provided by A reduced pressure principle assembly is: A. health hazard B. low Hazard C. pollution Hazard S. system hazard | A. Health hazard |
| A line pressure gauge reading at test cock for on an RP will be approximately. A. 1 psi less than actual line pressure B. 5 PSI less than actual line pressure C. Six or more PSI less than actual line pressure D. 6 PSI greater than actual line pressure | C. Six or more PSI less than actual line pressure |
| The US EPAs total coliform rule contains requirements for: A. Awrobic bacteria monitoring B. Cross connection surveys C. Plumbing code compliance D. State compliance schedules | C. Plumbing code compliance |
| A fluid velocity increase results in an: A. Decreased flow area B. Increased flow area C. Increase in pressure D. Reduction in pressure | D. Reduction in pressure |
| A pump discharge generating 43 PSIg (297 kpa) will result in a water column height of: A. 10ft B. 34 ft C. 85 ft D. 100ft | D. 100 ft |
| The critical installation level for a water closet ball cock is ____ inches A. 1in B. 2in C. 3in D. 6in | A. 1in |
| Atmospheric vacuum breaker is not permitted for use with: A. back siphonage B. contaminants C. continuous pressure D. pollutants | C. Continuous pressure |
| A spill resistant vacuum breaker is protection for: A. Containment back pressure B. Containment back siphonage C. Isolation back pressure D. Isolation back siphonage | D. Isolation back siphonage |
| The application of a double check valve assembly is based on: A. Contamination toxicity B. daily water use C. degree of Hazard D. plumbing system pressure | D. Plumbing system pressure |
| Backflow prevention assembly sha'll be tested: A. Annually B. upon installation C. after repair service D. all of the above | D. All the Above |
| Design pressure of an RP is created by: A. the relief valve spring B. the number to check valve C. closing the number to shut off d. the spring on the number one check valve | D. The spring on the number one check valve |
| During a field test of a RP assembly 2nd check valves failure is indicated by: A. An increase in the differential pressure reading a decrease in B. diferential pressure reading with relief valve discharge C. no change in diferential pressure reading D. di | B. A decrease in diferential pressure reading with relief valve discharge |
| During a field test of a RP assembly a momentary Drift from relief valve while testing the number to check indicates. A. Number one check failing B. number 2 check failing C. number 2 disc compression D. failing relief valve | B. Number two check failing |
| When testing check valve number one of a double check if the water continues to flow out of the test cock number three and most probable cause is: A. Lincoln number to Check B. Number two shut off valve leak C. number two check valve leak D. number one | D. Number one shut off valve leak |
| After bleeding the test cocks on a pressure vacuum breaker the hoses connected to: A. Number 1 Test cock and low side B. number 1 Test cock and high side C. number two test cock and low side D. number two test cock and high side | D. Number two test cock and high side |
| In testing the RP the number one test cock is used for: A. A test when the assembly is experience severe water hammer B.flushing the unit of air when the assembly is subject to winterization C.connecting to number for test cock if the relief valve rating | C. Connecting to number for test cock if the relief valve reading cannot be reduced to open the relief |
| Well testing SVP the check valve water continues to run from the bleed screw which of the following is true: A. Number two line valve is leaking B. number one line valve is leaking C. check valve is leaking D. who in the world knows | B. Number one line valve is leaking |
| Identify the primary factor which contributes to the reversal of flow of water in Pipelines: A. gradience of pipeline B.distance to point of use from the reservoir or pump C. high velocity of flow D. back siphonage | D. Back siphonage |
| During a field test of a reduced principle assembly II check valves failures indicated by A. an increase in the differential pressure reading B. a decrease in diferential pressure reading with relief valve discharge C. no change in the differential press | B. A decrease in the diferential pressure reading with relief valve discharge |
| You have completed testing the number one check valve on a double check valve assembly he used to bleed valve arrangement to acquire of valve of .7 PSI across number one check valve you may proceed in the following manner: B. Fail Number one check valve a | B. Fail the number one check valve and the assembly repairs the number one check valve must be made prior to continuing the test |
| A fire sprinkler system containing black iron pipe should be protected with a minimum of A. double check B. atmospheric vacuum breaker C. air gap D. pressure vacuum breaker | A. Double check |
| Nsbb is not installed in areas that contain A. check valves Downstream B. hazardous chemicals C. Othervacuum breakers D. toxic fumes | B. Hazardous chemicals |
| Hey water column elevation of 83 inches is approximately blank PSI A. 1 B. 2 C. 3 D. 4 | B. 2 |
| When testing the air Inlet of a pressure vacuum breaker you have opened the high side control needle valve one quarter turn the indicated diferential pressure is 0 but the air and let has not opened what does this indicate: A. There's back pressure to the | B. The air Inlet is leaking |
| When testing me number one check valve of a double check valve assembly you have opened the number 3 test cock to atmospheric the water recedes from the site to how do you proceed: C. Lower the casket to the center line of the assembly record the reading | Lower the test kit to the center line of the assembly record the reading as a static pressure drop across check valve number one note that the number two check valve and the number two shut off valve are leaking and terminate the test |
| What a perfect vacuum at sea level draws water up into a 40 foot pipe the pressure in the pipe above the water surface is: A. 0 B. 33.9 feet of water C. 14.7 psia D. 29.92 inches of mercury | A. 0 |
| The establishment of a list of acceptable backflow prevention assembly for the service protection of the water supply system as the responsibility of the A. local Health Department B. the Environmental Protection Agency C. the water purveyor D.the dep | B. The Environmental Protection Agency |
Created by:
Standjmcstrong