PC Plumber Pipe Installation & Repair 3

Question 1

When transitioning from copper pipe to CPVC pipe, which fitting must be used to prevent a chemical reaction between the two materials?

Accepted Answer

A copper-to-CPVC transition fitting

Answer

Dedicated copper-to-CPVC transition fittings are required because CPVC solvent cement is incompatible with copper and direct connections can fail.

Question 2

What is the maximum allowable temperature for CPVC hot water supply pipe according to most plumbing codes?

Accepted Answer

180°F

Answer

CPVC is rated for continuous use up to 180°F, making it suitable for residential hot water supply lines.

Question 3

A plumber is running PEX tubing through a wall cavity. Which tool is used to expand the PEX end before inserting an expansion fitting?

Accepted Answer

PEX expansion tool

Answer

A PEX expansion tool (used with expansion fittings) enlarges the pipe end so it can be pushed over the fitting and then contracts to form a leak-tight seal.

Question 4

Under the IPC, what is the minimum pipe size for a water service line supplying a single-family residence?

Accepted Answer

3/4 inch

Answer

The IPC requires a minimum 3/4-inch water service pipe for a single-family dwelling to ensure adequate flow and pressure.

Question 5

What condition causes PVC pipe to expand and potentially crack if installed without expansion loops or offsets in long horizontal runs?

Accepted Answer

Thermal expansion

Answer

PVC has a high coefficient of thermal expansion, so long runs must include offsets or expansion loops to absorb movement and prevent cracking.

(PC) Plumber Certification Practice Test

(PC) Plumber Certification Practice Test

PC Plumber Pipe Installation & Repair 3