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666 IP > DWV Code Quiz > Flashcards

DWV Code Quiz Flashcards

1
Q
  1. The minimum size floor drain for a residential installation is:
    a. 1-1/2”
    b. 2”
    c. 3”
    d. 4”
A

b. 2”

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2
Q
  1. Multiple shower heads may be served by a single trap, provided: (pick the answer that is incorrect):
    a. there are not more than 8 drains
    b. they are all in the same room
    c. they cannot receive food waste
    d. they are in a trench against the wall
A

a. there are not more than 8 drains

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3
Q
  1. What are the minimum test requirements for an underground sanitary building drain?
    a. an air pressure of 700 kpa for 2 hours
    b. a 3m head of water for 15 minutes
    c. 32mm of smoke fore 1 hour
    d. a visual inspection only
A

b. a 3m head of water for 15 minutes

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4
Q
  1. Prior to inspection, piping must be:
    a. tested
    b. approved by the AHJ
    c. checked by a supervisor
    d. removed and replaced when passed
A

a. tested

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5
Q
  1. Where is the clean out for a grease interceptor required to be placed?
    a. on the upstream piping
    b. on the vent
    c. on the downstream piping
    d. on the branch it drains to
A

c. on the downstream piping

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6
Q
  1. A sanitary building drain with 820 fixture units and a grade of 1/100 would have a diameter of”
    a. 6”
    b. 8”
    c. 10”
    d. 12”
A

b. 8”

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7
Q
  1. What is the minimum size of a combined building sewer with a load of 400 L and 270 fixture unites with a grade of 2%?
    a. 3”
    b. 4”
    c. 5”
    d. 6”
A

b. 4”

400 + (270 x 9.1) = 2766

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8
Q
  1. What is the minimum size of a floor drain that may be unvented?
    a. 2”
    b. 3”
    c. 4”
    d. 5”
A

b. 3”

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9
Q
  1. An 1-1/4”, a 1-1/2” and a 2” line all enter a sump within a building. What is the minimum size od a sump vent?
    a. not needed
    b. 1-1/4”
    c. 2”
    d. 3”
A

c. 2”

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10
Q
  1. What is the max length of a trap arm for a vented 3” floor drain?
    a. 2m
    b. 2.8m
    c. 3.6 m
    d. 4 m
A

c. 3.6 m

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11
Q
  1. In the diagram, where would be the best location for an additional circuit vent?
    a. A
    b. B
    c. C
    d. D
A

b. B

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12
Q
  1. An interceptor must be of sufficient capacity to:
    a. allow for grease to separate from the discharge
    b. allow turbulent flow through it
    c. allow the discharge to retain its heat
    d. not required cleaning for years
A

a. allow for grease to separate from the discharge

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13
Q
  1. When would a sand or grit interceptor be installed?
    a. always
    b. only when requested by the owner
    c. when required by the city or municipality
    d. never
A

c. when required by the city or municipality

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14
Q
  1. What is the purpose of the “flow control fitting” used with a grease interceptor?
    a. To speed up flow through the interceptor
    b. To slow down flow through the interceptor
    c. To increase flow through the piping downstream of the interceptor
    d. Slow down flow through the piping downstream of the interceptor
A

b. To slow down flow through the interceptor

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15
Q
  1. Piping that is too low to drain to a building drain is termed:
    a. subsoil drainage
    b. ponding drainage
    c. subdrainage
    d. subpar drainage
A

c. subdrainage

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16
Q
  1. A sewage sump, if inside a building, must have a(n):
    a. airtight cover
    b. warning sign
    c. guard around it
    d. perforated lid
A

a. airtight cover

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17
Q
  1. A sewage sump shall discharge into:
    a. a branch
    b. the building drain
    c. the building sewer
    d. a SOWS
A

b. the building drain

or

c. the building sewer

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18
Q
  1. The hydraulic load of a continuous-flow fixture, such as a pump, shall be:
    a. 31.7 FUs per gallon/minute
    b. 900 L per gallon/minute
    c. 900 gallon per L/second
    d. 31.7 FUs per L/second
A

d. 31.7 FUs per L/second

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19
Q
  1. The minimum size of floor drain for a residential installation is:
    a. 1-1/4”
    b. 1-1/2”
    c. 2”
    d. 3”
A

c. 2”

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20
Q
  1. When connecting a SOWS to a horizontal branch that serves a BRG upstream of the connection point, the proper fittings to use are:
    a. a TY and 1/8 bend
    b. a wye and 1/4 bend
    c. a wye and 1/8 bend
    d. a long-turn 1/4 bend
A

c. a wye and 1/8 bend

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21
Q
  1. What is the max size fixture drain that may connect to a wet vent?
    a. 1-1/4”
    b. 1-1/2”
    c. 2”
    d. 3”
A

c. 2”

22
Q
  1. What is the minimum and max trap arm length of a 4” unvented floor drain?
    a. 2 times pipe diameter minimum and 4.8 m maximum
    b. 2 Times pipe diameter minimum and 9.6 m maximum
    c. 450 mm minimum and 4.8 m maximum
    d. 450 mm minimum at 9.8 m maximum
A

d. 450 mm minimum at 9.8 m maximum

23
Q
  1. The correct size of a sump vent for a sump with a 4 inch branch draining to it is:
    a. 1-1/2”
    b. 2”
    c. 3”
    d. 4”
A

c. 3”

2” min, max 4”

24
Q
  1. 1 L per second equals:
    a. 15.9 GPM
    b. 31.7 GPM
    c. 900 GPM
    d. 2360 GPM
A

a. 15.9 GPM

25
Q
  1. 1 L per second equals:
    a. 9.1 FU
    b. 31.7 FU
    c. 900 FU
    d. 2360 FU
A

b. 31.7 FU

26
Q
  1. 1 gallon per minute equals:
    a. 16 FU
    b. 9.1 FU
    c. 31.7 FU
    d. 900 FU
A

b. 1.9 FU

27
Q
  1. When a building drain or branch could be subject to backflow:
    a. Normally closed back water valve is installed on either the branch or building dream
    b. Normally open back water valve is installed on either the branch or building drain
    c. a normally open back water valve is installed on the branch only
    d. Normally closed back water valve is installed on the building train only
A

b. Normally open back water valve is installed on either the branch or building drain

28
Q
  1. A nominally-vertical pipe is one which is installed at an angle of:
    a. 45 degree with the vertical
    b. 45 degree with the horizontal
    c. more than 45 degrees with the horizontal
    d. all of the above
A

d. all of the above

29
Q
  1. The max permitted length of a fixture outlet pipe is:
    a. 600 mm
    b. 750 mm
    c. 900 mm
    d. 1200 mm
A

d. 1200 mm

30
Q
  1. Which of the following statements is true:
    a. all traps (other than WC) must have a cleanout at the lowest part or must be removable
    b. lavs, sinks, and laundry trays shall have clean-outs at the lowest part of the trap or it shall be removable
    c. drum traps may never be used
    d. bell traps are permitted in drainage systems if used in conjunction with an interceptor
A

b. lavs, sinks, and laundry trays shall have clean-outs at the lowest part of the trap or it shall be removable

31
Q
  1. The minimum permissable grade on a 2” trap are is :
    a. 1/8” per foot (1 in 100)
    b. 1/4” per foot (1 in 50)
    c. one pipe diameter
    d. two pipe diameters
A

b. 1/4” per foot (1 in 50)

32
Q
  1. The minimum permissible length of a 2” trap are is:
    a. 2” (50mm)
    b. 4” (100mm)
    c. 6” (150mm)
    d. there is no mimimum length
A

b. 4” (100mm)

2 x the pipe diameter for trap arms

33
Q
  1. An 8” building drain with a max load of 1700 FU must be laid with a minimum grade per foot of:
    a. 1/16” (1 in 200)
    b. 1/8” (1 in 100)
    c. 1/4” (1 in 50)
    d. 1/2” (1 in 25)
A

c. 1/4” (1 in 50)

34
Q
  1. The max number of FU that can drain into a 3” SOWS from one storey in a 5 storey building is:
    a. 18
    b. 20
    c. 30
    d. 60
A

a. 18

35
Q
  1. The minimum size of a stack vent required for a 4 inch soil or waste stock carrying 90 fixture units, when the length of a stack then is 10.68m is:
    a. 4”
    b. 3”
    c. 2-1/2”
    d. 2”
A

b. 3”

36
Q
  1. The TY required for the connection of the 1-1/4” trap arm to the wet vent from a WC would be:
    a. 1-1/2” x 1-1/2” x 1-1/4”
    b. 2” x 1-1/4” x 1-1/2”
    c. 2” x 2”x 1-1/4”
    d. 2” x 1-1/2” x 1-1/4”
A

d. 2” x 1-1/2” x 1-1/4”

37
Q
  1. The max cumulative change in direction on a trap arm serving a basin is:
    a. 45 degrees
    b. 90 degrees
    c. 135 degrees
    d. 225 degrees
A

c. 135 degrees

38
Q
  1. Which of the following raps are not permitted?
    a. a trap with a trap seal of less than 100mm
    b. a bell trap
    c. a “P” trap
    d. a bell trap
A

d. a bell trap

39
Q
  1. An oil interceptor requires:
    a. no vent pipes
    b. 1 vent pipe
    c. 2 vent pipes
    d. 3 vent pipes
A

c. 2 vent pipes

40
Q
  1. Vent stacks are required when:
    a. a SOWS received the discharge from fixtures located on more than 4 stories
    b. a. a SOWS received the discharge from fixtures located on more than 5 stories
    c. a. a SOWS received the discharge from fixtures located on more than 10 stories
    d. a. a SOWS received the discharge from fixtures located on more than 11 stories
A

a. a SOWS received the discharge from fixtures located on more than 4 stories

41
Q
  1. What is the max number of 90° bends which may be used on the trap arm of a water closet?
    a. 1
    b. 2
    c. 3
    d. 90s may not be used
A

b. 2

42
Q
  1. The downstream end of a P-trap seal may be connected to the trap arm by:
    a. a running thread
    b. a union with a gasket seal
    c. a slip joint
    d. a lock nut
A

c. a slip joint

43
Q
  1. To prevent overflow in a sink that is not fitted with an integral or overflow, it is accepted to us a(n):
    a. standing waste
    b. float valve
    c. automatic siphon
    d. supply regulator
A

a. standing waste

44
Q
  1. In which of the following locations would a slip joint not be permitted?
    a. anywhere on a venting system
    b. on the inlet to a trap
    c. to connect a trap to a tray
    d. on the fixture outlet of a 3-compartment sink
A

a. anywhere on a venting system

45
Q
  1. When wet venting a water closet through a lav, the wet vented portion must be:
    a. 1-1/4”
    b. 1-1/2”
    c. 2”
    d. 3”
A

c. 2”

46
Q
  1. What is the max length of a 1-1/4” continuous vent?
    a. 4 m
    b. 7 m
    c. 9 m
    d. no max
A

c. 9 m

47
Q
  1. The max number of FU that can be carried by a 2” SOWS is:
    a. 6
    b. 8
    c. 18
    d. 24
A

d. 24

48
Q
  1. What is the max number of FU which may drain from any one floor in a 2” SOWS?
    a. 6
    b. 8
    c. 18
    d. 24
A

a. 6

49
Q
  1. The max number of WC that may drain to a 3” SOWS is:
    a. 2
    b. 4
    c. 6
    d. 8
A

c. 6

50
Q
  1. To size a vent other than an individual or dual vent, the follwoing info must be used:
    a. size of traps being served
    b. total FU
    c. length of pipe
    d. all of the above
A

d. all of the above

666 IP (31 decks)

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