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Plumbing Level 3 > Learning tasks > Flashcards

Learning tasks Flashcards

1
Q

True or false: plumbers install water distribution systems

A

True

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2
Q

Define Service Water heater

A

a device for heating water for plumbing services

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3
Q

Who uses private water sources and where can they be found?

A

Rural
lakes and wells

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4
Q

What is a benefit in having a water meter?

A

can determine if there are any leaks or unauthorized use of water taking place

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5
Q

What are the 2 basic types of water meters?

A

positive displacement
velocity

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6
Q

Where are positive displacement meters used most?

A

residential (very accurate)
small commercial

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7
Q

What type of meter is sensitive to flow rates and have a high accuracy?

A

Positive displacement meters

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8
Q

What is the minimum size of water service that would require a bypass?

A

1 1/2” (40mm)

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9
Q

What is a Fixture supply pipe also called?

A

graded supply

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10
Q

What is a fixture supply pipe?

A

a pipe installed bn a fixture / another building water distribution pipe.

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11
Q

What is another name for a stop-and-drain?

A

stop-and-waste

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12
Q

What is the largest control valve with a drain?

A

1”

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13
Q

True or False: sprinklers are on a metered system.

A

False

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14
Q

Why are PRV installed?

A

to limit the max pressure to 550kPa (80psi)

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15
Q

Do fixture units for irrigation systems have to be added to the water service sizing?

A

Yes

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16
Q

What must be supplied in every dwelling and where WC and lavs are mandatory?

A

a hot water supply

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17
Q

Define a service water heater

A

is an expansive fluid and a device for heating water for plumbing services

18
Q

Does direct heating have it’s own heat source?

A

Yes, uses combustion fuels

19
Q

Does Indirect heating have its own heat source?

A

nope, gets its heat from remote heat services (boilers, solar etc)

20
Q

What are point of distribution water heaters?

A

water heaters that serve the entire domestic hot water distribution system

21
Q

What is a point of use water heater?

A

a water heater designed to deliver hot water almost instantaneously

22
Q

Where are point-of-use water heaters installed?

A

location of the fixture

23
Q

True or False: Indirect water heaters has its hot water from a heat source the flows through one side of a heat exchanger

A

True

24
Q

Define indirect service water heater

A

a service water heater that gets its heat from a heating medium such as warm air, steam or hot water.

25
Q

What does an anode rod do?

A

protect exposed steel areas against corrosion

26
Q

What are anode rods made of?

A

either aluminum or magnesium

27
Q

What is the purpose of a dip tube?

A

deliver cold water near the bottom of the tank

28
Q

Where is a temperature and relief valve installed on all HWT?

A

12 inches from the floor

29
Q

Where are point -of-use heaters aka booster heaters installed?

A

commercial dishwashers

30
Q

What temperature do booster heaters boost it to?

A

180 F or 82 C

31
Q

What is an advantage to electric water heaters?

A

They do not require a vent
can be installed in various locations

32
Q

What is the efficiency of an electric water heater?

A

100%

33
Q

what is the efficiency of a gas-fired tankless water heater?

A

80%

34
Q

Why is storing hot water at temperatures below 60 C 140F not a good idea?

A

may lead to the growth of legionella bacteria

35
Q

True or false: hot water delivered at 60 C (140 F) will severely burn human skin in 1 to 5 seconds

A

true

36
Q

What do manufacturer’s water heating sizing calculations use?

A

a 2 hour window

37
Q

What are 2 types of mixing valve design?

A

pressure - balanced and temperature activated (thermostatic)

38
Q

What happen if hot water tanks are allowed to operate at excessively high pressures?

A

creates bursts of water / piping noise when a fixture is first opened

39
Q

Where should the thermal expansion tank be placed?

A

always on the cold water piping supply
downstream of any non-return valve or device

40
Q

How are circ pumps sized?

A

by height

41
Q
A
42
Q

What are compound meters?

A

Meters that feature both positive displacement and velocity (turbine)

Plumbing Level 3 (26 decks)

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