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

Sweat fittings (also called solder fittings) are the traditional method for joining copper pipe — the joint is heated with a torch and solder is drawn into the fitting by capillary action.

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

The T&P (temperature and pressure) relief valve opens automatically if pressure or temperature in the water heater exceeds safe limits, venting water/steam to prevent a catastrophic tank failure.

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

Black iron pipe has no protective coating and is used for gas lines, while galvanized pipe is coated with zinc for corrosion resistance and is used for water supply (though rarely in new construction).

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

Per the International Plumbing Code, a residential toilet contributes 4 drainage fixture units (DFU) to the drain system for sizing purposes.

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

A union fitting allows two pipe sections to be easily separated and reconnected without cutting, making it essential for equipment that may need future servicing or removal.

Other Skilled Trades Practice Test

Other Skilled Trades Practice Test

Other Skilled Trades Pipefitting and Plumbing 2