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Plumbing Level 2 > Class Final > Flashcards

Class Final Flashcards

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1
Q

Complete the following statement, “On the same circuit, do not mix convectors with?

A

Freestanding cast-iron radiators

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2
Q

Where a building trap is installed, a fresh air inlet shall be installed on the building drain upstream of the trap:

A
  • as close as possible to the trap
  • within 1.2m of the trap
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3
Q

IR thermometer size ratio equals 10:1, at 1/8 a meter away, the spot size will be?

A

10:1 = Distance (D) : Spot (S)
Ex: 1m (D) => 0.1m (S)

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4
Q

How many Fixture Units are you allowed to drain into a sows if the stack was to act as a relief vent?

A

6 FU

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5
Q

The formula to calculate USGPM when the BTU heat requirement is known is?

A

Delta T x 60 x 8.33

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6
Q

the max number of Fixture Units that may be connected to a horizontal branch off a 2” stack that passes through 5 storeys is?

A

6 FU
(question 25 on DWV exam)

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7
Q

Max number of Fixture Units that may be connected to 3” stack of 60m in developed length is?

A

102 FU
(question 26 on DWV exam)

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8
Q

What method of heat transfer does a fin tubed baseboard utilize in a heating room?

A
  • Convection –> convection currents
    (Convection is mostly used)
  • Conduction –> via aluminum / copper fins
    (very little radiation)
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9
Q

In testing a 5 storey (15 m) stack with water, the pressure at the base of the stack on the gauge would read:

A

147 kPa
(Q 36 DWV exam)

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10
Q

Thermistors are what?

A

are more sensitive to small temperature change
Have a quick response time
(a resistance sensor that changes its resistance in non-linear way)

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11
Q

Heat intensity is measurable with?

A

a degree fahrenheit
(Temperature)

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12
Q

Any vent pipe shall extend vertically above the flood level rim of a fixture:

A

to adjust above the flood level rim before connecting to another vent

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13
Q

Where is the ideal location for a pump on boiler?

A

Immediately downstream of the point of no pressure change

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14
Q

What fixture is popular in Europe that is designed for washing genitals?

A

Bidet

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15
Q

A vertical pipe means what?

A

45 degrees from the vertical

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16
Q

What independent, self-funded organized group oversees safe installation system equipment including gas across BC?

A

TSBC (technical safety BC)

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17
Q

A roof vent terminal terminating into open air shall be located at a distance not less than?

A

3.5m away from any window, door or other opening

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18
Q

A vent shall be installed to protect the base of every soil or waste stack that passes through more than?

A

4 storeys

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19
Q

Total fall of a fixture drain from the trap weir to the vent fitting shall not exceed?

A

two times the diameter of the pipe

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20
Q

What is the most common temp drop used in heating (in celsius)

A

11 C (20 F)
Also called design temp difference (delta T)

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21
Q

The max length of an offset on a 4” sows serving as a wet vent is?

A

max 2.5m
(Q 38 DWV exam)

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22
Q

Rate of discharge through 1/4 fixture outlet pipe is called?

A

Fixture Unit

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23
Q

Max permitted length 3/8 supplied tube for fixture?

A

Cold water supply for toilet–> 1/2” (13mm) copper or PEX supply pipe w/ 3/8” (9.5mm) flexible tube or hose.
Fixture supply tubes: 3/8” OD and 30” in length
pg 109 C-1

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24
Q

In the production of fixtures, what material is most difficult to form?

A

Stainless steel

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25
Q

A 2” trap not listed in table 2.4.9.3 has a hydraulic load of?

A

3 FU
(question 24 on DWV exam)

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26
Q

DMM (digital multi-meter): to measure amperage requires meter to be connected (to what or how?)

A

Requires connecting the meter in series w/ the circuit being tested.
(Have to disconnect a wire from terminal / connection of the test leads bn wire end / terminal it was removed from. becomes part of the circuit)

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27
Q

Max water temp permitted in bathtub or shower head?

A

49 C
(120 F)

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28
Q

What is the min length of a trap arm serving a lavatory?

A

2 1/2”
- find fixture outlet pipe size and code states length = min twice the size of fixture drain. (2.5.6.3 - a)
(Q 40 DWV exam)

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29
Q

A kitchen sink with a domestic type garbage disposal unit installed on it has a hydraulic load of?

A

1 1/2 FU
(question 23 on DWV exam)

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30
Q

What is downdraft?

A

A condition in which a draft is forced downward and can cause a flue gas spillage.

31
Q

Min size vent for a 2” trap?

A

1 1/2”
(Q 30 on DWV exam)

32
Q

What size vent terminal would be required for…?
What size vent terminal would be required for a 1 1/2” vent?

A

1 1/2” x 3”

33
Q

Which arrangement may allow a fixture to self-siphon?

A

Trap too far below fixture
(Q 41 DWV exam)

34
Q

What would be the size of a trap that serves two lavatories that are in the same room?

A

1 1/2”
(Q 46 DWV exam)

35
Q

unit heaters are?

A

Convectors

36
Q

A pump rated at 10 GPM would add a load to the combined sewer ___L

A

681

37
Q

In a typical indoor environment approximately how much of a person’s body heat is released by thermal radiation to colder surfaces?

A

48%

38
Q

What is used to monitor temperature of water in the storage tank type water heater?

A

thermostats
(which activates elements when needed)

39
Q

A branch cannot be connected within 1.5m of the base of the stack:

A
  • Receives a discharge of 30 or more FU
  • Receives a discharge from fixtures located on 2 or more storeys
    (Q 32 DWV exam)
40
Q

Which type of temperature sensing device can determine the temperature of a surface from the distance with no need to contact or object?

A

Pyrometer –> modern pyrometer is a device that can determine the temp of a surface w/ no need for contact w/ object)
pg 41 B4

41
Q

The size of a portion of vent pipe that terminates through the roof shall not be less than?

A

3”
(Q 4 DWV exam)

42
Q

What is a max design flush cycle for a HET (high-efficiency toilet)?

A

4.8 L

43
Q

The potential difference between 2 points in an electrical circuit is know as?

A

Voltage drop
pg 51 B4

44
Q

What is the size of a trap and waste opening for a potato peeler?

A

2”
(question 28 on DWV exam)

45
Q

The length of a trap arm shall not proceed?

A

The developed length of the trap arm is min twice the size of the fixture drain

46
Q

Strapping shall not be used on a pipe size greater then?

A

4”

47
Q

The building sewer begins outside a building at what point?

A

1m from building wall

48
Q

Trap seals refers to the vertical distance measured from:

A

the trap weir to the trap dip
(Q 35 DWV exam)

49
Q

The max accumalative change of direction to a trap arm serving a lavatory is?

A

135 degrees

50
Q

If a 4” building drain connected to 3” soil stack, what would the size of the clean out be at the base of the stack?

A

4”
(Q: 42 DWV exam)

51
Q

What is the name for a type of pressure reading where the instrument registers the difference in pressure between two contained working fluids?

A

differential pressure

52
Q

What is the min size for a circular rainwater leader?

A

2”

53
Q

What is a min grade on a building drain?

A

1% (1/8 or 1:100)
(Q 43 DWV exam)

54
Q

What material is often used for the manufacturing of valve parts because of its high resistance to corrosion?

A

Brass

55
Q

The max number of Fixture Units that may be connected to a 4” building drain at uniform grade of 1 in 50 is:

A

240 FU
(question 27 on DWV exam)

56
Q

What is the purpose of the pilot flame?

A

Pilot flame ignites a main burner(s)

57
Q

Rain water leader sizing is based on rainfall volume in ___ over a period of ___? (in min)

A

mm over 15 min

58
Q

Max distance between hangers on horizontal run of ABS plastic pipe shall be?

A

1.2m (4’)

59
Q

If 8 w/c are required in a washroom, how many urinals can be substituted for w/c’s?

A

5
(2/3)

60
Q

Trap arm size is based on?

A

The size of the fixture outlet pipe
(Q 45 DWV exam)

61
Q

What components operation is interrupted if the LWCO (low water cut off) operates?

A

The burner

62
Q

Hot water boilers normally operate at average temp of?

A

121 C

63
Q

Max number of w/c allowed on a 3” soil stack is?

A

6 water closets

64
Q

What classification system relates to the amount of time the barrier that will hold back fire?

A

Fire stop ratings
(piping must be non-combustible or fire-rated thermoplastic piping)

65
Q

You must connect a sanitary building drain with a combined building sewer. If an open air restaurant is located on the roof of the building and the roof drain has to be located within 1m of the patio, What must you do to ensure that your rough-in passes inspection?

A

Place a running trap and clean out on the storm building drain prior to its connection with the building sewer.

66
Q

What is the max steam pressure that a house steam heating system should operate at?

A

2 psi

67
Q

One foot of head is equal to?

A

.433 psi

68
Q

What is the hydraulic load of a 3” floor drain in a public washroom?

A

No load

69
Q

What is the max horizontal length of a w/c fixture drain?

A

3m (10’)

70
Q

What is the name of piping system in which water has approximately the same distance to travel for each heat transfer unit?

A

The 2 pipe reverse - return system –> each circuit is of nearly equal length.
HTU w/ shortest supply line = longest return pipe route

71
Q

Shower receptor for 2 or 3 heads is equal to a hydraulic load of?

A

3 FU
(question 22 on exam)

72
Q

Fixtures that drain in a vertical section of a relief or circuit vent shall not have a hydraulic load more than?

A

1 1/2 FU

73
Q

What does part 7 of CSA B149.1 outline?
What does part 4 of CSA B149.1 outline?

A

7 = outlines specific type of appliances
4 = general requirements

74
Q

What are the ignition temperatures of NG, Propane and Butane?

A

NG = 1300 F –> 700 C
Propane = 920 F –> 495 C
Butane = 900 F –> 480 C

Plumbing Level 2 (8 decks)

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