Deck 20: Cross Connections

Question 1

The air gap is the most reliable cross-connection protection.

Answer 1

True

Question 2

Which of the following backflow protection methods cannot be used on continuous pressure applications?

A)air gap
B)reduced pressure zone backflow preventer
C)atmospheric-type vacuum breaker
D)none of the above

Answer 2

C

Question 3

Which backflow prevention method is considered the most efficient and most reliable?

A)air gap
B)double-check valve assembly
C)pressure-type vacuum breaker
D)atmospheric-type vacuum breaker

Answer 3

A

Question 4

A contaminated water supply system contains a dangerous substance that is a health hazard.

Question 5

Give one location where an RPZ backflow preventer should not be installed.

Question 6

Name the three commonly recognized types of backflow.

Question 7

Air gaps are typically ____ times the diameter of the supply pipe.

A)1
B)2
C)3
D)4

Question 8

A polluted system can be referred to as a ____ hazard risk.

A)low
B)medium
C)high
D)toxic

Question 9

The minimum distance for an air gap is 1 inch.

Question 10

____ backflow is a reversal of normal flow in a system because downstream pressure is greater than the supply pressure.

A)Back-pressure
B)Gravity
C)Back-siphonage
D)Suction

Question 11

If a faucet with a ½-inch opening is located 4 inches from an adjacent wall, what is the required air gap distance?

A)1 inch
B)1½ inches
C)2 inches
D)2½ inches

Question 12

Back-pressure backflow is the same as back-siphonage backflow.

Question 13

Which of the following backflow prevention methods is approved for all hazards?

A)air gap
B)atmospheric-type vacuum breaker
C)double-check valve assembly
D)pressure-type vacuum breaker

Question 14

____ occurs when unsafe water flows into the potable water system because the unsafe water is at a higher elevation.

A)Back-pressure backflow
B)Gravity backflow
C)Back-siphonage backflow
D)Capillary backflow

Question 15

Most dishwashers have a(n)____ as an internal backflow device to protect the potable water supply.

A)air gap
B)reduced pressure zone backflow preventer
C)pressure-type vacuum breaker
D)high loop vacuum breaker

Question 16

____ backflow is a reversal of normal flow in a system caused by a negative pressure (vacuum)in the potable water supply.

A)Gravity
B)Back-siphonage
C)Back-pressure
D)none of the above

Question 17

The level of backflow protection required is influenced by the degree of hazard of possible contaminants.

Question 18

In general, backflow prevention devices should not be installed in pits where flooding could occur.