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Plumbing Year 4 > Red seal 3 > Flashcards

Red seal 3 Flashcards

1
Q

what is the manganese green sand filter used for:

A

to remove ferrous iron, manganese and hydrogen sulphide.

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2
Q

A wet stand pipe system requires which CCC device, when pipes are not susceptible to freezing?

A

DCVA

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3
Q

which is the first take off on common water service system?

A

fire sprinkler

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4
Q

the minimum vent height for a RV dumping station is in meters:

A

2m

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5
Q

when sizing a water softener, how many gallons are consumed by 4 people in a house?

A

240

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6
Q

what type of waste does a sterilizer give off?

A

acidic

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7
Q

what’s the minimum size water supply to a urinal flush tank?

A

3/8”

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8
Q

whats the minimum pipe size for a medical gas piping?

A

1/2”

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9
Q

hydrogen sulphide is removed by?

A

manganese zeolite filters, aeration, and chlorination.

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10
Q

an activated carbon filter removes?

A

Taste and odour

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11
Q

iron can be removed by?

A

water softener

polyphosphate

Iron filler

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12
Q

what is a maintenance bond purpose?

A

to ensure good workmanship

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13
Q

What is the name of the quick connect adaptor used on a well system with series 160 PE piping?

A

Pitless adaptor

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14
Q

the flow from a wash down ventilation pump into a drainage system is taken as:

A

1L/s =31.7Fus

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15
Q

what is draw down?

A

the measured depth that water in the well lowers when the well is being pumped (used).

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16
Q

if a pipe from the well to the house is not graded properly:

A

its difficult to maintain pressure and prime the pipe

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17
Q

on a wall hung water closet, the distance from the face of the wall to the bowl is set by:

A

back up nuts and washers

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18
Q

A PVB is installed how high above the critical level?

A

12”

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19
Q

every acid waste trap, must have a water seal of at least:

A

2”

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20
Q

the minimum size of the water distribution pipe in a building is:

A

1/2”

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21
Q

the minimum protection used when incorporating a pre-rinse sink would be:

A

An AVB (atmospheric vacuum breaker)

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22
Q

Every oil interceptor, shall be provided with vents that:

A

extend to open air

connect to the interceptor at opposite ends

terminate at elevations differing by not less than 300mm (12”)

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23
Q

A cleanout for a trap, which serves a leader or a sub-soil drain is installed:

A

over the trap upstream of the trap

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24
Q

one trap may serve a group of floor drains, showers or laboratory sinks provided:

A

all fixtures must be in the same room

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25
Q

What is installed on a centrifugal pump to prevent the water from draining backwards?

A

Check Valve

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26
Q

to lower the PH you need to use:

A

a Neutralising filter

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27
Q

The maximum number of flushometer WCs, that can discharge into a 80mm (3”) stack is:

A

6 WCs

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28
Q

How many RWLs are required for a 40 m x 40 m roof, that uses flow controlled roof drains.
(rainfall intensity is 20mm per 15 mins.)

A

2

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29
Q

why is there salty water after the regenration cycle on a water softener?

A

the rinse cycle is too short

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30
Q

All the waste openings that serve a 3 compartment sink are 1 1/1’ what is the minimum size of trap?

A

2” (2.4.9.3. [2] )

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31
Q

what is required when installing long, straight horizontal or vertical runs of copper domestic hot water piping?

A

expansion joints

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32
Q

the rule for air breaks sizing:

A

1” or the same pipe diameter

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33
Q

what is the purpose of pressure balancing valves?

A

to prevent scalding

34
Q

what is the minimum size for a building drain?

a - 2”
b - 1 1/2”
c - 4”
d - none of the above

A

none of the above

35
Q

2 back to back WCs are roughed in at 254mm from the finished walls. if the partition is 125mm hollow tile and the wall finish is 19mm what is the c-c distance of the sleeves?

A

254 x 2= 508mm
19 x 2= 38mm
partion=125mm

ALL EQUALS 671mm

36
Q

what material is best for a corrosive waste tank?

A

corrosion resistant concrete

37
Q

what is the distance between labels on medical gas lines?

A

20’

38
Q

An underground water service is installed using thrust blocks. What additional method could be used to restrain the joints?

A

1/2’ ss continuous rodding

39
Q

A cold water pipe is offset 1.2m using 45 degree elbows. What is the approximate length of the diagonal pipe?

A

1.2m x 1.414m = 1.7m

40
Q

What equipment is required if coliforms are detected in a water system?

A

Chlorinator

41
Q

what is the name of the part of the blueprint which gives the details of fixtures and appliances:

A

equipment plan

42
Q

What is the minimum air gap for a 2” pipe?

A

100mm (2x the diameter of the pipe) [2.6.2.9. (2)]

43
Q

What is the test protocol for a residential sprinkler system?

A

Min 200 psi or 50 psi over working pressure for at least 2hrs

44
Q

A heating system requires an in-line flow switch. Where would this type of switch be located?

A

Supply main

45
Q

When a gas line passes from one building to another building, where is it necessary to install a gas cock?

A

the exit and entry points of each building

46
Q

What is the manufacturers recommended maximum length of 3/4” heat pex tubing in a radiant heat floor system?

A

500ft

47
Q

what size of condensing unit would be required for a building with a heating load of 54,000 BTUh?

A

4.5 tons

48
Q

How does the finned baseboard in a hydronic heating system heat the room?

A

convection

49
Q

what size of urinal flush tank in gallons is required for 4 urinals?

A

5 gallons

50
Q

if a six impeller stage pump was replaced with a nine impeller stage pump what would the outcome be?

A

psi increase of almost 30 psi

51
Q

what is the minimum amount of showers required for a public pool?

A

3

52
Q

If pressure in the top floor mechanical room was 235 kPa and the building was 22m tall what is the pressure in Kpa at the bottom of the building?

A

455 Kpa FIGURE THE MATH

53
Q

When testing medical gas lines, what do you test for?

A

Pressure, cross-connection, contaminant, and Flow

54
Q

What is the best way to check for iron in a water system?

A

In the toilet tank

55
Q

Name 3 most common materials used to make septic tank?

A

concrete, fibreglass, and polyethylene

56
Q

What occurs in the septic chamber?

A

Anaerobic bacteria breakdown

57
Q

What is the maximum layer of scum in inches that insulates the tank?

A

9”

58
Q

Yoke vents are required on buildings of what height?

A

more than 11 storeys?

59
Q

How far must a water meter be from any entrance, wall or grade wall in inches

A

12”

60
Q

how is an offset relief vent for an offset sized

A

an Offset vent for an offset is sized to be one size smaller than the stack vent and must comply with 2.5.7.1.

61
Q

What valve is requires that interconnects the hot downfeed and recirc line when the lower floors are supplied by hot downfeed system?

A

Balancing valve

62
Q

Any macerating toilet has what size of a drain?

A

3/4”

63
Q

How many backwater valves does an elevator pit require that drains into an empty sump pit and into a lower building drain?

A

2

64
Q

When sizing a 7 m offset in a RWL, which table do you use?

A

2.4.10.9

65
Q

an oil interceptor occasionally is connected to an oil secondary receiver. what is the minimum size of an oil secondary receiver’s vent?

A

1 1/2”

66
Q

An air admittance valve shall be located not less than ______ mm above the fixture drain being vented?

A

100mm

67
Q

Every commercial building shall have a premise protection by which CCC device?

A

DCVA

68
Q

What device on a Jacuzzi that is used with the pump to produce the rate of flow through the jets?

A

Air Volume switch

69
Q

what temp should a drinking fountain be?

A

10 degree C

70
Q

what is the recommended length in time of flush for a urinal?

A

3-5 secs

71
Q

What is the advantage of using a plastic nut and washer rather than a steel nut and washer for fastening a two-handle faucet to the fixture?

A

if the faucet should leak around the stem, a plastic nut and washer will not deteriorate as a metal nut and washer would

72
Q

The NPC stipulates that bath tub faucets must be restricted to what maximum flow temp?

A

120 degree F (48.9 degree C)

73
Q

What is the minimum size of supply line required for diaphragm flush valves used on urinals.

A

3/4”

74
Q

what must be taken into consideration when mounting a booster domestic water pump on the floor?

A

noise and vibration transmitted through building

75
Q

Why must a strainer be installed on the main or high-pressure side of a PRV?

A

to prevent dirt from becoming lodged between the PRV and the seat and disk.

76
Q

What is the most important issue when trying to locate a PRV in a 20 storey building, where the mechanical room with hot water tanks are located on the floor of a downfeed system?

A

.433psi/ft allowance for pressure gain or loss to calculate the PRV location

77
Q

what is the advantage of a two pipe lines drawing to a single line drawing

A

easier to interpret

78
Q

How to keep a submersible pump from overheating?

A

make sure it pumps below the drawdown line.

79
Q

what pump is designed primarily for shallow well applications?

A

single pipe jet pump

80
Q

what is an indication of hard water?

A

scale on bathroom fixtures

80
Q

What does the red seal represent?

A

represents excellence and provides greater mobility across Canada for skilled workers

Plumbing Year 4 (28 decks)

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