BACKFLOW PREVENTION PRACTICE EXAM AND CORRECT ANSWERS

BACKFLOW PREVENTION PRACTICE EXAM AND CORRECT
ANSWERS

Containing a plumbing system from the public water supply requires backow protection
at the _______?

A. Appliance or xture

B. Building foundation

C. Irrigation system

D. Service Connection

E. Sprinkler riser

Correct answer: Service Connection



Backow preventer manufacturers recommend that assemblies be eld-tested annually
and when_____?

A. Installed

B. Moved

C. Repaired or Installed

D. Shut down

E. Water suppliers provide notice

Correct answer: Repaired or Installed



A dierential pressure gauge reading of 0.2 psid is represented on water column sight tube
by _____?

A. 1/16 in. (0.16 cm)

B. 1/2 in. (1.3 cm)

C. 2 in. (5.1 cm)

,D. 3.5 in. (8.9 cm)

E. 5.5 in. (14 cm)

Correct answer: 5.5 in. (14 cm)



Pollution of a public water supply suggests the substance in the water is ____?

A. Aesthetically bad

B. Biological with virus only

C. Lowering the pH below 1.4

D. Radiological

E. Toxic

Correct answer: Aesthetically bad



Backsiphonage may occur when the pressure inside copper tubing is ____?

A. Greater than atmospheric pressure

B. Greater than barometric pressure

C. Greater than 0 gauge pressure

D. Less than absolute pressure

E. Less than atmospheric pressure

Correct answer: Less than atmospheric pressure



A cross-connection may be a permanent piping arrangement or a(n) ____?

A. Backow preventer

B. Church symbol

C. OSHA hazardous area designation

D. Railroad and highway intersection sign

E. Temporary hose bibb connection

,Correct answer: Temporary hose bibb connection



The isolation of a plumbing water system hazard requires____?

A. Appliance protection

B. Building quarantine

C. High-hazard protection

D. Meter protection

E. Toxin monitoring

Correct answer: Appliance protection



A direct cross-connection suggests the piping system may be subjected to ____?

A. Backpressure or backsiphonage

B. Backsiphonage only

C. Periodic inspection

D. Sustained pressure

E. Toxic materials

Correct answer: Backpressure or backsiphonage



A pipe restriction's ow velocity increase may allow ____?

A. Aspiration

B. Backpressure

C. Low turbulence

D. Pressure head

E. Pressure surges

Correct answer: Aspiration

, Water supply contamination from backow may result in ____?

A. A bad taste

B. Coloration

C. Death

D. Odor or smell

E. Pipe wall mineral deposit aking

Correct answer: Death



To prevent backow, an atmospheric vacuum breaker is primarily designed to ____?

A. Allow air into the outlet piping system

B. Create an elevation loop above ground

C. Introduce head loss

D. Prevent backpressure

E. Restrict velocity

Correct answer: Allow air into the outlet piping system



Atmospheric vacuum breakers will typically be located on ____?

A. Commercial irrigation systems

B. Fire-suppression systems

C. Plumbing xtures or appliances

D. Utility storage tanks

E. Water service connections

Correct answer: Plumbing xtures or appliances



The mechanical component of an atmospheric vacuum breaker serves as an air-inlet valve
and a ____?