Other Skilled Trades Pipefitting and Plumbing 2

Question 1

What type of fitting is used to join copper pipe using heat?

Accepted Answer

Sweat (solder) fitting

Answer

Compression fitting

Answer

Flare fitting

Answer

Push-connect fitting

Question 2

What is the function of a pressure relief valve (PRV) on a water heater?

Accepted Answer

To relieve excess pressure or temperature to prevent tank explosion

Answer

To regulate incoming water pressure

Answer

To mix hot and cold water

Answer

To prevent backflow into the supply line

Question 3

What is the difference between black iron pipe and galvanized pipe in plumbing?

Accepted Answer

Black iron has no zinc coating and is used for gas; galvanized is zinc-coated and used for water supply

Answer

They are identical products with different brand names

Answer

Black iron is used for hot water; galvanized for cold water

Answer

Black iron is plastic; galvanized is metal

Question 4

How many fixture units does a standard toilet contribute to a building drain system per the IPC?

Accepted Answer

4 fixture units

Answer

1 fixture unit

Answer

3 fixture units

Answer

6 fixture units

Question 5

What is a 'union' fitting used for in a piping system?

Accepted Answer

To allow a section of pipe to be disconnected and reconnected without cutting the pipe

Answer

To connect two pipes of different materials

Answer

To increase water pressure

Answer

To reduce pipe diameter

Question 6

What test is performed on a newly installed DWV (drain-waste-vent) system to check for leaks before closing walls?

Accepted Answer

Air pressure test or water test (ball test)

Answer

Hydrostatic pressure test

Answer

Smoke test

Answer

Dye test