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Plumbing Year 4 > Red seal 1 > Flashcards

Red seal 1 Flashcards

1
Q

What is the height to distance safety ratio for ladders?

A

4:1

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2
Q

Temporary platform scaffolding must have toe-boards installed when the scaffold is more then _______m above ground?

A

3.5m

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3
Q

Class A fire extinguishers are used and contain?

A

combustible materials and water

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4
Q

Type B fire extinguishers are made for?

A

Flammable liquids

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5
Q

Type C extinguishers are made for?

A

Live electrical equipment

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6
Q

Type D fire extinguishers are made for?

A

Combustible metals. Sand

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7
Q

Type K fire extinguishers are made for?

A

Commercial cooking appliances. Wet chemical.

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8
Q

When using a powder actuated fastening tool, and the device fails to fire when the trigger is pulled, what is the first thing you should do?

A

Keep tool in position and wait 30 seconds

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9
Q

How many 2” pipes does it take to equal the volume capacity of a 6” pipe?

A

9

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10
Q

When using oxy-fuel cutting and welding equipment, a flashback arrestor protects the operator from what?

A

Flame travelling back into the hoses

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11
Q

Horizontally run 3/4” pipe must be supported every ____m?

A

2.5m

8 ft

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12
Q

water with a PH balance of 5.5 would be considered?

A

mildly acidic

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13
Q

Copper tube permitted for underground water distribution:

A

Type K soft

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14
Q

Which is not an apporved method for joining cast iron waste pipe:

A

welded joint

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15
Q

dielectric unions are used for:

A

to prevent corrosion

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16
Q

when installing glass pipe; if a filed cut needs to be done, the ends should be joined using:

A

bead to plain joint

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17
Q

bell and spigot cast iron should be installed with the:

A

Bell upstream

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18
Q

what force would be exerted on the gate of a closed 6” vlave if the water pressure acting on it measured 46psig?

A

1300

6/2=3
3 squared = 9
9x pi = 28.3
28.3 x 46 = 1300

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19
Q

Asbestos cement pipe installed below a 60mm thick concrete floor must be at least how deep?

A

600mm (24”)

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20
Q

What is the maximum practical lift of a shallow well jet pump?

A

25’

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21
Q

a backwater valve may be installed in a building drain provided that it is:

A

normally open

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22
Q

the discharge from a sump pump shall have the following fittings installed in order, in the direction of flow:

A

Union, Check valve, shut off valve

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23
Q

when a well pump turns on as soon as a faucet is used the most likely cause is:

A

water logged pressure tank

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24
Q

a 4” cast iron pipe with 1” insulation is to pass through a wall. how large a diameter hole is required to be cut:

A

6.5”

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25
Q

a gear pump is a positive displacement pump and must be installed with a:

A

pressure relief valve

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26
Q

what type of trap is not permitted in a drainage system:

A

bell trap

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27
Q

where is the jet located in a deep well?

A

above the foot valve

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28
Q

how would you increase the length of flush on a flushometer?

A

turn regulating screw counter clockwise

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29
Q

six equally spaced lavs are to be installed along a wall that is 530cm long and will be vented with dual vents. determine the C to C distance of the vents if the fixtures are 51cm wide:

A

177cm

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30
Q

a 3” drainage pipe (1/4”p/ft) suspended from a ceiling inside a building at its most upstream end is 7.5” from the ceiling to the C of P. what will the measurement be from the ceiling to the center of pipe if it travels 26’ horizontally, has an 8’ horizontal offset and continues another 37’?

A

25.2”

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31
Q

what is the minimum length of a trap arm?

A

2x pipe diameter

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32
Q

a branch with 34 fixture units discharges into a sewage sump. what is the minimum size vent the sump requires?

A

3”

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33
Q

what is the maximum vertical fall of a water closet trap arm?

A

1m

34
Q

a building roof measuring 90m by 50m would require how many flow controlled roof drains:

A

5

1 per 900m2 but at least 2 when using flow controlled drains

35
Q

A flat roof measuring 20m by 26m with a horizontal wall on one side extended up 6m by 20m. size the circular rain water leader if the local 15 minute rain fall intensity is 24mm:

A

5”

36
Q

a lab sink that receives bio-hazard waste must be installed with a:

A

clean-out above flood level rim

37
Q

the absorption rate of a septic field is determined by:

A

percolation test

38
Q

medical gas piping is most commonly joined by:

A

silver braze

39
Q

a circuit vented branch with a horizontal offset that uses two 45 degree fittings will require:

A

an additional circuit vent

40
Q

determine the amount of expansion that will occur when a 15m abs pipe has a temperature change of 40 degrees C. ER of ABS is .000099.

What is the formula?

A

LOE = COE x L x Delta T

5.94mm

41
Q

a properly cut thread on black iron pipe should allow how many hand turns with a fitting?

A

4.5

42
Q

a well with a water tight casing requires a minimum standoff distance from a septic system of:

A

15m

43
Q

an air conditioner that discharges .05L/s of condensate into a floor drain would equate to how many fixture units?

A

2

2.4.10.3. Hydraulic Loads from Fixtures with a Continuous Flow
1) Except as provided in Sentence (2), the hydraulic load from a fixture that
produces a continuous flow, such as a pump or an air-conditioning fixture, is
31.7 fixture units for each litre per second of flow.

44
Q

an interceptor may act as a trap for a fixture provided that:

A

it has a 38mm water seal

45
Q

underground piping installed in a dug trench should be covered with appropriate backfill to a height of?

A

300mm

46
Q

Which is not a hot water heating piping system?

A

one pipe gravity return

47
Q

the ideal location for a circulatory pump installed in a hot water heating system is:

A

on the supply after the expansion tank

48
Q

a pipe that connects at its downstream end to 2 or more vent pipes and at its upper end to a vent stack or stack vent is a:

A

Branch vent

49
Q

a vertical cylindrical tank measuring 60cm in diameter and is partially filled with water to a height of 48cm. find the volume of water.

A

VoC= V=πr2l or h. divide by 1000l/ft3

135.7L

50
Q

when determining the location to install a condensing boiler what must be considered?

A

putting it near a floor drain

the condensate drain line goes to the floor drain

51
Q

the discharge piping from a service water heater’s temperature and pressure relief valve must discharge within _____ of the floor drain:

A

300mm (12”)

52
Q

length is not a consideration when sizing this vent:

A

relief vent

53
Q

a cross fitting may not be used in DWV systems except to connect:

A

four vents

54
Q

a 1/2” extracted tee may be formed from:

A

3/4” type k

55
Q

if 4 shower heads are installed along a wall, what would the minimum measurement be between the two outermost heads.

A

2.25m (750mm between each)

56
Q

the minimum size for vents servicing an oil interceptor are:

A

1 1/4”

57
Q

A Four Wire Zone Valve is wired to:

A

Thermostat, transformer, end switches

58
Q

which of the following fixtures may not be indirectly connected to a drainage system?

A

Commercial dishwasher

Becuase the discharge water is hotter then what is permissible by code

59
Q

The minimum size for mobile home service connections are:

A

4” sewer and 3/4” water

60
Q

A pressure reducing valve must be installed if the water service pressure is above:

A

80psi (550kpa)

61
Q

A twin water tank softener will house the brine in one tank and _____ in the other:

A

Zeolite

62
Q

Where should you locate a fin tube radiator within a room?

A

under a window

63
Q

Water that has a dissolved mineral content of >181mg/L would be deemed:

A

Hard

181mg/l / 17.1 = 71 mg/l = 7 hard

64
Q

A private water supplied cistern is fitted with a 3/4” make up water supplied pipe by a municipal system. What size air gap would be required:

A

1 1/2”

2.6.2.9. at least 25mm or 2 times pipe diameter which ever is greater

65
Q

a 3/4” water branch with a developed length of 6.5m, and a pressure range of 325kpa could supply how many public use showers, spray multi heads?

A

5

chart

66
Q

the abbreviation NPS refers to:

A

pipe size (nominal pipe size)

67
Q

what is the maximum horizontal offset permitted in a 3” soil and waste stack that is serving a wet vent?

A

2.5m

68
Q

which manufacturing method produces the strongest pipe?

A

Extruded

69
Q

Why is an offset relief valve vent sized one size smaller than the stack vent?

A

Becasue there might not be a vent stack under some of the conditions of an offset relief vent

70
Q

What is the purpose of the distribution box?

A

to distribute and inspect the laterals into the distribution field.

71
Q

when selecting a septic field and you run across a high water table or bedrock, what is your best option?

A

install a mound field

72
Q

even though a radon piping system is not plumbing code or inspected, a lot of plumbers install them. in order of installation name these items from the ground up:

A

Manometer, fan and gooseneck

73
Q

what size ball do you require while doing a ball test, where the size of the pipe is 3” or more:

A

50mm

74
Q

what is the purpose of the 2 chambers in a septic tank?

A

to assist through anaerobic bacteria in the septic chamber in breaking down the solids into liquid form and into flow into the effluent chamber.

75
Q

Where are Shut off valves required in buildings?

A

2.6.1.3.

1) water service pipes CURB COC
3) Supply risers for multi dwelling
4) WC on the supply pipe
5) multi family dwellings where the water supply enters the dwelling
6) in non residential buildings:
a) every fixture or
b) any group of fixtures in the same room
7) hot water tanks

76
Q

What is the tempered temp of water supply?

A

2.2.10.7.

49 deg C or 120 deg C

77
Q

What is the water usage per flush cycle?

res WC?
Comm WC?
Urinals?

A

2.6.1.6.

WC -res
single flush and dual flush 4.8 LPF

WC - comm 6 LPF

Urinals 1.9 LPF

78
Q

what do these lines mean

__ . __ . __
__ .. __ .. __
__ … __ … __

A

__ . __ . __ = cold
__ .. __ .. __ = Hot
__ … __ … __ = recirc

79
Q

what is the formula for converting inches to millimetres

A

1” = 25.4 mm

80
Q

what is the formula for converting def F to deg C?

A

(?°F − 32) × 5/9 = °C

(?°C × 9/5) + 32 =°F

Plumbing Year 4 (28 decks)

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