Water Supply & Distribution

Question 1

What color background is used for a sign to indicate non potable water at a fixture?

Answer 1

Yellow

Question 2

True or False:

An air gap method of backflow prevention is approved for backpressure situations.

Answer 2

False

Question 3

True or False:

A vacuum breaker wall hydrant or hose bibb is approved for backsiphonage situations.

Answer 3

True

Question 4

True or False:

A backflow preventer with intermediate atmospheric vents is approved for some backpressure situations.

Answer 4

True

Question 5

True or False:

An air gap method of backflow prevention
is approved for high hazard situations.

Answer 5

True

Question 6

Fill in the blank:

A spill-resistant pressure vacuum breaker must be installed in an upright position a minimum of ______ inches above all downstream piping.

Answer 6

1257

Question 7

Fill in the blank:

A double check valve backflow preventer shall be installed in the ______ position unless otherwise listed.

Answer 7

horizontal

Question 8

Fill in the blank:

A reduced pressure principle backflow prevention assembly shall be installed in the ______ position unless otherwise listed.

Answer 8

horizontal

Question 9

What is the minimum air gap required for an effective opening that is 3/4” in diameter where affected by side walls?

Answer 9

2 1/4”

Question 10

What is the minimum air gap required for an effective opening that is 1” in diameter where affected by side walls?

Answer 10

3”

Question 11

What is the minimum air gap required for an effective opening that is greater than 1” in diameter where affected by side walls?

Answer 11

three times the effective opening

Question 12

What is the minimum access between the lowest portion of a backflow preventer assembly and the floor?

Answer 12

12”

Question 13

True or False:

Direct connections between potable water piping and sewer-connected wastes shall be permitted.

Answer 13

False

Question 14

Fill in the blank:

The vacuum breaker for a water closet flushometer valve shall be installed on the discharge side of the valve not less than ______ inches above the overflow rim of the fixture.

Answer 14

6

Question 15

Where chemicals are introduced into a steam or hot water boiler system, which of the following backflow prevention assemblies shall be used?

a. double check valve backflow prevention assembly
b. atmospheric vacuum breaker
c. spill resistant pressure vacuum breaker
d. reduced-pressure principle backflow preventer assembly

Answer 15

d. reduced-pressure principle backflow preventer assembly

Question 16

Fill in the blank:

Vacuum breakers for washer-hose bedbans shall be located not less than ______ feet above the floor.

Answer 16

5

Question 17

What is the maximum allowable lead content in pipe, fittings, plumbing fittings and fixtures intended to convey water for human consumption?

Answer 17

0.25%

Question 18

Fill in the blank:

A plastic building supply pipe below ground shall be buried with a tracer wire of not less than ______ AWG suitable for direct burial.

Answer 18

144

Question 19

Fill in the blank:

PEX shall not be installed within the first ______ inches of piping connected to a water heater.

Answer 19

18

Question 20

Which of the following materials is not permitted for water distribution piping?

a. CPVC
b. Galvanized Steel
c. PP
d. PVC

Answer 20

d. PVC

Question 21

What color primer is required for CPVC solvent cement fitting connections?

Answer 21

orange

Question 22

What is the minimum diameter for a bend made with PE pipe?

Answer 22

30 pipe diameters

Question 23

Fill in the blank:

PVC piping shall not be exposed to direct sunlight unless it does not exceed ______ inches and is wrapped or protected from UV degradation.

Answer 23

24

Question 24

Fill in the blank:

Valves that are larger than ______ inches shall be permitted to have cast iron or copper alloy bodies.

Answer 24

2

Question 25

# True or False: In multi dwelling units, each unit is required to have a water supply shut off valve, accessible to the unit controlled by the valve.

Answer 25

True

Question 26

# Fill in the blank: Potable water supply tanks shall have an overflow that is not less than \_\_\_\_\_\_ square inches.

Answer 26

16

Question 27

What is the maximum pressure setting for a pressure relief valve on a potable water system?

Answer 27

150 psi

Question 28

# Fill in the blank: The discharge pipe from a temperature and pressure relief valve which terminates outside shall not be lower than \_\_\_\_\_\_ above the ground and pointing downwards.

Answer 28

6 inches

Question 29

# Fill in the blank: The bottom of a water supply pipe in a trench running above a clay building sewer shall be not less than \_\_\_\_\_\_ inches above the sewer pipe.

Answer 29

12

Question 30

# Fill in the blank: An air test on water supply piping shall be a minimum of \_\_\_\_\_\_ psi.

Answer 30

50

Question 31

# Fill in the blank: When disinfecting a potable water system with a chlorine solution of 200 parts per million, the system shall be valved off and allowed to stand for \_\_\_\_\_\_ hours.

Answer 31

3

Question 32

# Fill in the blank: Hot water piping insulation shall be a minimum wall thickness of\_\_\_\_\_\___ for pipes up to 2 inches in diameter.

Answer 32

not less than the diameter of the pipe

Question 33

When calculating the pressure loss of a water piping system, which of the following is not necessarily a factor? a. backflow preventer b. water softener c. faucet aerator d. tankless water heater

Answer 33

c. faucet aerator

Question 34

# Fill in the blank: Typical fire sprinklers shall have a rating of not less than \_\_\_\_\_\_ degrees Fahrenheit.

Answer 34

135

Question 35

# Fill in the blank: Typical fire sprinklers shall have a rating of not less than \_\_\_\_\_\_ degrees Fahrenheit.

Answer 35

400

Question 36

# Fill in the blank: The area of coverage of a single fire sprinkler shall not exceed \_\_\_\_\_\_ square feet.

Answer 36

12 feet

Question 37

What is the minimum distance for a pendent sprinkler from an obstruction if the sprinkler deflector is 9 inches above the bottom of an obstruction?

Answer 37

6 feet

Question 38

Which of the following is not a possible source for fire sprinkler water supply? a. storage tank b. private well system c. rainwater catchment system d. public water main

Answer 38

c. rainwater catchment system

Question 39

When calculating for a fire sprinkler system, what is the water service pressure loss for a 3/4 inch water service pipe if the flow rate is 12 gpm and the pipe is 50 feet long?

Answer 39

18.4 psi

Question 40

What is the maximum allowable pipe length for a fire sprinkler system given the following information: 3/4" PEX Tubing Sprinkler flow rate: 28 gpm, System pressure: 55 psi

Answer 40

33 feet

Question 41

When calculating water supply sizing for public use fixtures, what is the individual fixture unit value for each flushometer valve if there are five or more water closet valves installed?

Answer 41

10

Question 42

When calculating water supply sizing for public use fixtures, what is the accumulative fixture unit value for urinal flushometer valves if there are two installed?

Answer 42

35

Question 43

What is the minimum fixture branch water supply pipe size for a clothes washer?

Answer 43

1/2"

Question 44

What is the water meter and street service pipe size if the system pressure is 55 psi, the developed length is 180 feet and the fixtures require 52 WSFU?

Answer 44

1 1/2"

Question 45

What is the water system branch pipe size if the system pressure is over 60 psi, the developed length is 70 feet and the fixtures require 6 WSFU?

Answer 45

1/2"