Chapter 4 & 5 Flashcards
- The differential relief valve on a Reduced Pressure Backflow Assembly is,_____________________?
a) Spring loaded open
b) Spring loaded closed
c) Has a minimum loading of 1.0 psi.
d) Is not tested
a) Spring loaded open
The DCVA is adequate protection in both severe hazard backpressure and backsiphonage conditions.
True Or False
False
What is the minimum test requirement for check valve #2 on a DCVA?
a) 27 ¾” of water column
b) 1.0 psid in reverse flow
c) 1.0 psid in direction of flow
d) 1.0 psia against flow
c) 1.0 psid in direction of flow
The differential relief valve on a Reduced Pressure Principal Backflow assembly must maintain the
“Zone of Reduced Pressure” at a minimum of _
a) 3.0 psid more than inlet side
b) 2.0 psid more than inlet side
c) 3.0 psid less than inlet side
d) 2.0 psid less than inlet side
d) 2.0 psid less than inlet side
The check valve in a Spill Resistant Pressure Vacuum Breaker is
A)internally loaded to the normally open position
b) biased to the normally open position
c) is float operated in the normally closed position
d) force-loaded to the normally closed position
A) Internally loaded to the normally open position
Dual Check Valves require an annual performance test as a national requirement
True or False
What is the correct air gap separation for a 2” diameter production fill line on a caustic soda dilution
tank?
a) 2”
b) 4”
c) 6”
d) 8 **
b) 4”
What is the minimum installation height above a 2” supply line for an Atmospheric Vacuum Breaker
upstream of an Air Gap supplying a chemical mixing tank?
a) 2”
b) 4”
c) 6”
d) 8”
c) 6”
The Air Inlet Valve of a Spill Resistant Pressure Vacuum Breaker is normally in the open position?
True or False
True
The Air Inlet Valve of a Pressure Vacuum Breaker is normally in the open position?
a) True
b) False
True
What is the minimum clearance measured from the rear of a PVB to the closest obstruction?
** a) 20 mm (3/4”)
b) 75 mm (3”)
c) 100 mm (4”)
d) 150 mm (6”)**
a) 20 mm (3/4”)
What is the minimum installation height above the highest outlet or flood level rim for an Atmospheric
Vacuum Breaker?
** a) 25 mm (1”)
b) 75 mm (3”)
c) 100 mm (4”)
d) 150 mm (6”)**
d) 150 mm (6”)
At what size does an assembly require adequate support blocks?
** a. 2”
b. 2 ½”
c. 3”
d. 4**
b. 2 ½”
Where is not permissible to install a backflow preventer which has an air inlet, air vent or relief port?
** a. In a mechanical room
b. Inside a utility area
c. In an enclosure
d. Outside in a garden**
c. In an enclosure
What is the primary concern when entering a confined space?
a. hazardous atmosphere
b. lack of room to move
c. a flood of water
d. a landslide or cave in
a. hazardous atmosphere
