Backflow
A check valve on a double check valve assembly is considered
"tight" if... - CORRECT ANSWER-It is drip tight at 1.0 psi differential
A cross connection means... - CORRECT ANSWER-A physical
arrangement whereby the potable water supply is connected,
directly or indirectly, continuously or intermittently with nonpotable
water or a secondary water source.
A leaky check valve on a double check assembly could be
attributed to... - CORRECT ANSWER-Number 2 shut-off valve
leaks
A pressure vacuum breaker may be used on a pressure connection.
T o F? - CORRECT ANSWER-True
A pressure vacuum breaker should have a minimum of how many
inches between its "critical level" and the overflow rim of an open
tank of chronic acid, used in the process of polishing steel plates? -
CORRECT ANSWER-12 inches
A purpose of the number three test cock on a PVB is to detect a
leaky downstream shut-off valve. T o F? - CORRECT
ANSWER-False
, A reduced pressure principle device must be installed at least: -
CORRECT ANSWER-12 inches above the floor
A secondary source of supply, such as a well, does not require
protection from backflow. T o F? - CORRECT ANSWER-False
A shut-off valve may be maintained downstream from a pressure
vacuum breaker; however, there shall be no possibility of imposing
pressure by pump or other means downstream from the device. T o
F? - CORRECT ANSWER-True
A tester arrives to test a reduced pressure principle device which
has been out of service. The tester opens the #1 shutoff valve to
establish water pressure within the device. Upon opening the valve,
the relief port continuously vents water. This venting is: - CORRECT
ANSWER-An indication of a fouled relief valve or fouled leaky #1
check valve
A USC Foundation for Cross-Connection & Hydraulic Research
(FCCCHR) approved device consisting of two independently
operating, internally-loaded check valves located between two
tightly closing shut-off valves, with four appropriately located test
cocks is a: - CORRECT ANSWER-Double check valve assembly
A vacuum relief valve is designed and approved for use as a
back-flow preventer. T o F? - CORRECT ANSWER-False
A check valve on a double check valve assembly is considered
"tight" if... - CORRECT ANSWER-It is drip tight at 1.0 psi differential
A cross connection means... - CORRECT ANSWER-A physical
arrangement whereby the potable water supply is connected,
directly or indirectly, continuously or intermittently with nonpotable
water or a secondary water source.
A leaky check valve on a double check assembly could be
attributed to... - CORRECT ANSWER-Number 2 shut-off valve
leaks
A pressure vacuum breaker may be used on a pressure connection.
T o F? - CORRECT ANSWER-True
A pressure vacuum breaker should have a minimum of how many
inches between its "critical level" and the overflow rim of an open
tank of chronic acid, used in the process of polishing steel plates? -
CORRECT ANSWER-12 inches
A purpose of the number three test cock on a PVB is to detect a
leaky downstream shut-off valve. T o F? - CORRECT
ANSWER-False
, A reduced pressure principle device must be installed at least: -
CORRECT ANSWER-12 inches above the floor
A secondary source of supply, such as a well, does not require
protection from backflow. T o F? - CORRECT ANSWER-False
A shut-off valve may be maintained downstream from a pressure
vacuum breaker; however, there shall be no possibility of imposing
pressure by pump or other means downstream from the device. T o
F? - CORRECT ANSWER-True
A tester arrives to test a reduced pressure principle device which
has been out of service. The tester opens the #1 shutoff valve to
establish water pressure within the device. Upon opening the valve,
the relief port continuously vents water. This venting is: - CORRECT
ANSWER-An indication of a fouled relief valve or fouled leaky #1
check valve
A USC Foundation for Cross-Connection & Hydraulic Research
(FCCCHR) approved device consisting of two independently
operating, internally-loaded check valves located between two
tightly closing shut-off valves, with four appropriately located test
cocks is a: - CORRECT ANSWER-Double check valve assembly
A vacuum relief valve is designed and approved for use as a
back-flow preventer. T o F? - CORRECT ANSWER-False
