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Plumbing Level 3 > Learning Task questions > Flashcards

Learning Task questions Flashcards

1
Q

Describe what Potable water is

A

Water that is safe for human consumption

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2
Q

By code every dwelling should be supplied with what?

A

potable water

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3
Q

True or False: Water supplies can be private or public

A

True

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4
Q

What are some above ground sources of water?

A

Lakes and rivers

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5
Q

What is an example of an underground water source?

A

Aquifers

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6
Q

Are “water services” upstream or downstream of the of the curb stop?

A

Upstream

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7
Q

Describes “Water Distribution System”

A

From: water service pipe / private water supply system
To: water supply outlets, fixtures, appliances / devices

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8
Q

What water distribution system is for inside buildings?

A

Building water distribution system

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9
Q

What type of water is contaminated water?

A

Water that contains matter
Is capable of seriously affecting health of people drinking the water

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10
Q

What type of hazard would Contaminated water fall under?

A

Severe Hazard

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11
Q

What kind of contaminates are in contaminated water?

A

organic or inorganic

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12
Q

True or False: Corporation stops are considered sacrificial (or Sacrificed)

A

True - they get buried underground

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13
Q

What is a Corporation Stop?

A

a valve installed on a municipal water main to permit joining of the water service pipe.

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14
Q

What is the definition of Cross Connection?

A

Any source of pollution, contamination or other material/ substance that could change water quality in drinking water supply

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15
Q

What term means: the use of water for human consumption, food preparation or sanitation?

A

Domestic Purposes

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16
Q

Are plumbers involved in the design of Municipal Water Distribution Systems?

A

As a whole, No.

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17
Q

Can plumbers install / maintain piping/ components of a Municipal Water Distribution System

A

Yes

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18
Q

What type of Hazard is Polluted water?

A

moderate hazard

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19
Q

Will polluted water cause serious injury to health?

A

No,

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20
Q

What kind of pollutants are in Polluted water?

A

Organic and Inorganic

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21
Q

Is polluted water treatable?

A

yes

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22
Q

What is a pressure system?

A

Is a water supply design that uses equipment / components that include pumps, pressure tanks / controls.

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23
Q

True or False: Pressure systems are private water supplies (ex: well water)

A

True

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24
Q

What is Raw water?

A

is Water in its natural state
Untreated water

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25
Q

What are examples of raw water?

A

rainwater, groundwater / water from bodies (lakes / rivers)

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26
Q

What is Used water?

A

Water from purveyor and has passed through property line or water meter / is no longer under control of water purveyor

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27
Q

Who / what is a water purveyor?

A

Is the owner or operator of a potable waterworks system

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28
Q

What are other names for a water purveyor?

A

Water provider or water supplier

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29
Q

Where does most of the raw water come from?

A

surface water sources (rivers / lakes)

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30
Q

What is another name for the Hydrologic cycle?

A

The water cycle

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31
Q

What is the Hydrologic / water cycle?

A

It’s the path water takes as it moves through the environment

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32
Q

What is Flocculation?

A

The thickening or coagulation of water (used in water treatment)
Alum - thickening agent?

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33
Q

What % is in chlorine solution?

A

1%

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34
Q

What are Head pressures?

A

aka Original sources
Surface water
Ground water (well)
Alternative supply

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35
Q

What does water stored in clouds store?

A

Carbon dioxide from the atmosphere

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36
Q

What is the level of natural precipitation?

A

close to 5.6

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37
Q

What is considered a universal solvent?

A

Water - it can dissolve more than any other liquid

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38
Q

What does Cross Connection Controls help with?

A

Helps prevent used water from backflowing into potable water supply systems

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39
Q

What is the best type of filtration?

A

Sand

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40
Q

What does filtration include?

A

removal of suspended particles, debris / algae

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41
Q

What does disinfection include?

A

removal of bacteria and viruses

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42
Q

When can water be considered Potable? (Mcb)

A

When water has been properly tested for its mineral, chemical / biological characteristics

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43
Q

True or False: Biological characteristics have to be tested by government agencies

A

True

44
Q

What types of system are Booster pumps used on?

A

Building water distribution systems

45
Q

What are the 2 different pumps based on operating principal?

A

Positive displacement
Centrifugal

46
Q

What type of pump (bn positive displacement and centrifugal) have a spinning action?

A

centrifugal

47
Q

What does the centrifugal spinning action create? (Vd)

A

Variable displacement

48
Q

How does a centrifugal pump move liquids?

A

Through rotational energy from one or more driven rotors aka impellers

49
Q

What does the action of an impeller do?

A

Increases fluid’s velocity / pressure and directs liquid through outlet

50
Q

What is the key component of a Centrifugal pump?

A

the impeller

51
Q

What does the impeller consist of?

A

curved vanes - responsible for movement / speed of water

52
Q

What are the entry and exit points of the fluid from a centrifugal pump?

A

entry = the impeller at the axis (eye)
Exists = along the circumference between the vanes

53
Q

What is a Volute?

A

the pump casing on a centrifugal pump

54
Q

How does a positive displacement pump move fluid?

A

by repeatedly enclosing a fixed volume / moving it mechanically through the system.
(like a piston)

55
Q

How does a reciprocating positive displacement pump work?

A

By the repeated back / forth movement (strokes) of either a piston, plunger or diaphragm

56
Q

What type of pump is electrically driven and multi-staged? (and a type of centrifugal pump)

A

Booster pump

57
Q

When are booster pumps used?

A

they are used to boost the water main pressure at different intervals based on pressure loss or elevation loss

58
Q

True or False: it is common to use a PRV (pressure reducing valve) on the downstream of a booster pumped system

A

True

59
Q

What is a hot water recirculating pump used for?

A

used to circulate domestic hot water to have hot water usable w/in seconds

60
Q

What is the difference bn a hot water recirc pump and hydronic circulator?

A

Hot water recirc has wetted - components that will not contaminate potable water supply

61
Q

What type of materials make of a hot water recirc pump to make it safe for potable water?

A

Bronze and stainless steel materials and plastics

62
Q

What are Jet pumps commonly used for?

A

To lift water from wells

63
Q

What are the 2 different designs of a Jet pump?

A

Shallow well - contains suction line
Deep well - contains suction and dry lines

64
Q

True or False: a Jet pump is 2 pumps in one: a centrifugal pump and an ejector

A

True

65
Q

What is another name for ejector?

A

Jet assembly

66
Q

What does the Ejector determine?

A

Pumping depth of the Jet pump

67
Q

What depth can a shallow well do to?

A

25’

68
Q

what depth can a deep well go to?

A

greater than 25’

69
Q

What is the main advantage of a Submersible pump?

A

Is that is does not require priming as the suction is submerged in the fluid.

70
Q

What types of submersible pumps do plumbers use?

A

sump pumps, sewage pumps, storm water pumps, deep well pumps.

71
Q

At what depth would you use a Deep well jet pump?

A

25’ - 110’

72
Q

At what depth would you chose a shallow well jet pump?

A

less than 25’

73
Q

When would you use a 4” submersible pump?

A

for lengths of 25’ - 400’

74
Q

What is the min coverage for freeze protection?

A

4’ - 5’

75
Q

What can the pressure in water supply mains exceed?

A

1380 kPa (200 psi)

76
Q

Why do water supply utilities use pumps?

A

to increase pressure in water mains to sufficient levels to supply water for firefighting
Overcome pressure loss in high rise buildings
supply water towers / tanks

77
Q

What must be installed if the pressure at any fixture exceeds 550kPa?

A

PRV (pressure reducing valve)
to limit the static pressure

78
Q

What are the 2 types of pressure reducing valves used on water supply systems?

A

Direct acting
pilot - operated

79
Q

Which of the 2 types of PRV are the most common?

A

Direct acting

80
Q

What type of valve is used for low flow rates and has a spring that is always loaded to the open?

A

Direct acting, spring loaded PRVs

81
Q

Why is a strainer always installed on the high-pressure side?

A

To prevent dirt / debris from becoming lodged bn the valve seat and disc, preventing it from shutting off.

82
Q

What is it called when a second PRV is installed immediately downstream of the first PRV?

A

a Series

83
Q

When 2 or more small PRVs are used to replace a large valve, Why would one have a slightly higher opening pressure?

A

To prevent both valves from operating during low-demand periods.

84
Q

What does having a higher set PRV (when there are 2 PRVs) prevent?

A

Valve seat etching dt passage of water bn the valve seat / disc
Reduces maintenance costs by causing only one valve to be in constant operation

85
Q

True or False: In Parallel PRVs, the smaller valve can handle very low demand periods

A

True
The larger PRV handles the peak demand flows

86
Q

When is a Vacuum relief valve used?

A

to prevent a vacuum condition from occurring in the piping

87
Q

What are the different options for air and vacuum relief valves? (there are 5, good luck)

A

-manually operated valves
-air released valve only
-vacuum relief valve only
-Separate air release / vacuum relief valves
-Combination air release / vacuum relief valves

88
Q

Why is air permitted to enter the combination air release / vacuum relief valve / replace water while line is being drained?

A

To prevent system collapse

89
Q

What degrees are corporation stop installed at?

A

30 - 40 degrees

90
Q

What is the purpose of a gooseneck on a residential water supply system?

A

for settlement and protects against frost heave

91
Q

Is the water service located on the inside or outside of the building?

A

Outside

92
Q

Is the water distribution pipe located on the inside or outside of a building?

A

Inside

93
Q

What is a Mueller thread?

A

Are fine threads and made of brass

94
Q

what length of time is Peak - demand flow considered for?

A

2 hours

95
Q

What is municipal water pipe’s max velocity?

A

5’ per second

96
Q

What does Hazen - Williams formula figure out?

A

pipe friction loss

97
Q

How is ductile - iron made?

A

centrifugal casting

98
Q

How is ductile - iron joined together?

A

push on or mechanical joints

99
Q

What are the different colours of PVC pipe?

A

Blue - potable water
Green - sewer
Purple - non - potable water
White - general use - radon
Gray - general use - electrical

100
Q

What is manufactures max limit joint deflection

A

5 degrees

101
Q

True or false: Stainless steel service saddles w/ a direct tapped tee is sacrificed.

A

True

102
Q

What causes Thrust?

A

water pressure and sudden changes in water velocity

103
Q

True or False: Thrust blocks provide restraint in vertically and horizontally

A

True

104
Q

Why do we use polyethylene film to cover fittings?

A

It helps with future disassembly or revision

105
Q

Where is hot tapping used most?

A

In hydraulics or sprinklers

106
Q

Polluted water is what?

A

Water that contains objectionable matter

Plumbing Level 3 (14 decks)

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