Learning tasks

Question 1

True or false: plumbers install water distribution systems

Answer 1

True

Question 2

Define Service Water heater

Answer 2

a device for heating water for plumbing services

Question 3

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

Answer 3

Rural
lakes and wells

Question 4

What is a benefit in having a water meter?

Answer 4

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

Question 5

What are the 2 basic types of water meters?

Answer 5

positive displacement
velocity

Question 6

Where are positive displacement meters used most?

Answer 6

residential (very accurate)
small commercial

Question 7

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

Answer 7

Positive displacement meters

Question 8

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

Answer 8

1 1/2” (40mm)

Question 9

What is a Fixture supply pipe also called?

Answer 9

graded supply

Question 10

What is a fixture supply pipe?

Answer 10

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

Question 11

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

Answer 11

stop-and-waste

Question 12

What is the largest control valve with a drain?

Answer 12

1”

Question 13

True or False: sprinklers are on a metered system.

Answer 13

False

Question 14

Why are PRV installed?

Answer 14

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

Question 15

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

Answer 15

Yes

Question 16

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

Answer 16

a hot water supply

Question 17

Define a service water heater

Answer 17

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

Question 18

Does direct heating have it’s own heat source?

Answer 18

Yes, uses combustion fuels

Question 19

Does Indirect heating have its own heat source?

Answer 19

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

Question 20

What are point of distribution water heaters?

Answer 20

water heaters that serve the entire domestic hot water distribution system

Question 21

What is a point of use water heater?

Answer 21

a water heater designed to deliver hot water almost instantaneously

Question 22

Where are point-of-use water heaters installed?

Answer 22

location of the fixture

Question 23

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

Answer 23

True

Question 24

Define indirect service water heater

Answer 24

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

Question 25

What does an anode rod do?

Answer 25

protect exposed steel areas against corrosion

Question 26

What are anode rods made of?

Answer 26

either aluminum or magnesium

Question 27

What is the purpose of a dip tube?

Answer 27

deliver cold water near the bottom of the tank

Question 28

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

Answer 28

12 inches from the floor

Question 29

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

Answer 29

commercial dishwashers

Question 30

What temperature do booster heaters boost it to?

Answer 30

180 F or 82 C

Question 31

What is an advantage to electric water heaters?

Answer 31

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

Question 32

What is the efficiency of an electric water heater?

Answer 32

100%

Question 33

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

Answer 33

80%

Question 34

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

Answer 34

may lead to the growth of legionella bacteria

Question 35

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

Answer 35

true

Question 36

What do manufacturer's water heating sizing calculations use?

Answer 36

a 2 hour window

Question 37

What are 2 types of mixing valve design?

Answer 37

pressure - balanced and temperature activated (thermostatic)

Question 38

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

Answer 38

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

Question 39

Where should the thermal expansion tank be placed?

Answer 39

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

Question 40

How are circ pumps sized?

Answer 40

by height

Question 42

What are compound meters?

Answer 42

Meters that feature both positive displacement and velocity (turbine)