BACKFLOW TEST V ESSENTIAL STUDY
QUESTIONS AND ANSWERS
◉ As you test the number one check valve of a double check valve
assembly you open the number three test cock to atmosphere. Water
continues to discharge from the sight tube. You may continue in the
following manner.
Answer: observe the reading on your test kit, slowly open the bleed
valve arrangement to compensate for a leaking number one shut off
valve
◉ Which of the following types of cross-connections are considered
to be illegal.
Answer: a by-pass hose with a shut off valve circumventing a
reduced pressure principle backflow
assembly
◉ Backsiphonage due to an aspirator effect may be caused by:.
Answer: high velocity flow of water through a pipe tee
◉ The term "approved reduced pressure principle assembly" applies
to:.
Answer: an assembly of two approved check valves, with an
approved differential relief valve between the check valves, four
,properly located and approved test cocks and two approved shut off
valves
◉ When a customer has a polluted "auxiliary" water supply on the
premises with no known connection to the distribution system the
water purveyor will normally require, as a minimum, that the
distribution system be protected by.
Answer: an approved double check valve assembly
◉ Backflow from a low inlet to a plating tank containing a toxic
solution is properly prevented by the installation of:.
Answer: a properly installed approved reduced pressure principle
backflow preventer
◉ When testing the number two check valve of a double check valve
assembly the sight tube and bleed valve arrangement shall be
installed in the following manner.
Answer: bleed valve arrangement on the number three test cock and
the sight tube on the number four test cock
◉ The certification of a backflow prevention assembly tester may be
revoked for:.
Answer: a) improper testing procedure
b) falsification of data on a test report form
, c) using inappropriate repair parts
D) all of the above
◉ The differential pressure relief valve must operate to maintain the
zone between the two check valves:.
Answer: at least 2 psi less than the supply pressure
◉ the proper test kit for measuring the pressure drop across a check
valve in a backflow prevention assembly in the field is a.
Answer: a 0-15 psi differential pressure test kit
◉ To properly test a reduced pressure principle backflow preventer
in the field the shut off valves must be:.
Answer: #2 closed, #1 open
◉ A direct connection between potable water piping and a sewer
connected waste line may exist if:.
Answer: such a connection is never permitted
◉ Identify the primary factor which most often contributes to the
reversal of flow of water in pipe lines:.
Answer: high velocity of flow
QUESTIONS AND ANSWERS
◉ As you test the number one check valve of a double check valve
assembly you open the number three test cock to atmosphere. Water
continues to discharge from the sight tube. You may continue in the
following manner.
Answer: observe the reading on your test kit, slowly open the bleed
valve arrangement to compensate for a leaking number one shut off
valve
◉ Which of the following types of cross-connections are considered
to be illegal.
Answer: a by-pass hose with a shut off valve circumventing a
reduced pressure principle backflow
assembly
◉ Backsiphonage due to an aspirator effect may be caused by:.
Answer: high velocity flow of water through a pipe tee
◉ The term "approved reduced pressure principle assembly" applies
to:.
Answer: an assembly of two approved check valves, with an
approved differential relief valve between the check valves, four
,properly located and approved test cocks and two approved shut off
valves
◉ When a customer has a polluted "auxiliary" water supply on the
premises with no known connection to the distribution system the
water purveyor will normally require, as a minimum, that the
distribution system be protected by.
Answer: an approved double check valve assembly
◉ Backflow from a low inlet to a plating tank containing a toxic
solution is properly prevented by the installation of:.
Answer: a properly installed approved reduced pressure principle
backflow preventer
◉ When testing the number two check valve of a double check valve
assembly the sight tube and bleed valve arrangement shall be
installed in the following manner.
Answer: bleed valve arrangement on the number three test cock and
the sight tube on the number four test cock
◉ The certification of a backflow prevention assembly tester may be
revoked for:.
Answer: a) improper testing procedure
b) falsification of data on a test report form
, c) using inappropriate repair parts
D) all of the above
◉ The differential pressure relief valve must operate to maintain the
zone between the two check valves:.
Answer: at least 2 psi less than the supply pressure
◉ the proper test kit for measuring the pressure drop across a check
valve in a backflow prevention assembly in the field is a.
Answer: a 0-15 psi differential pressure test kit
◉ To properly test a reduced pressure principle backflow preventer
in the field the shut off valves must be:.
Answer: #2 closed, #1 open
◉ A direct connection between potable water piping and a sewer
connected waste line may exist if:.
Answer: such a connection is never permitted
◉ Identify the primary factor which most often contributes to the
reversal of flow of water in pipe lines:.
Answer: high velocity of flow
