Deck 9: Cross-Connection Protection and Pipe Identification

Question 1

Name the three commonly recognized types of backflow.

Answer 1

gravity backflow, back-pressure backflow, back-siphonage backflow

Question 2

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

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

Answer 2

A

Question 3

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

Answer 3

True

Question 4

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

Question 5

Dishwashers have a(n) ____ as an internal backflow device for the potable water.

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

Question 6

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

Question 7

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 8

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

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

Question 9

The minimum distance for an air gap is 1 inch.

Question 10

If a faucet with a 1/2" opening is located 4" from an adjacent wall, what is the required air gap distance?

Question 11

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

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

Question 12

The air gap is the best cross-connection protection.

Question 13

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

Question 14

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

Question 15

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

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

Question 16

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

Question 17

If a utility sink has a hose attachment on the faucet, which backflow prevention method cannot be used?

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

Question 18

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

Question 19

Which color lettering is used to identify pipes carrying protective materials?

A) blue
B) red
C) purple
D) yellow

Question 20

____ occurs when unsafe water flows into the potable 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 21

According to the ANSI standard, what color should a fire sprinkler line be colored?