PC Material Selection & Properties 3

Question 1

What is the maximum temperature rating for standard CPVC pipe used in residential hot water distribution?

Accepted Answer

180°F (82°C)

Answer

CPVC pipe is rated for continuous service up to 180°F (82°C), making it suitable for hot water supply systems.

Question 2

Which cast iron pipe joint system uses a rubber gasket compressed by a stainless steel clamp?

Accepted Answer

No-hub (neoprene gasket) coupling

Answer

No-hub cast iron pipe uses a neoprene gasket and stainless steel clamp assembly, providing a flexible, leak-proof joint without molten lead.

Question 3

Which property of polypropylene (PP) pipe makes it preferred for chemical drain waste applications?

Accepted Answer

Excellent chemical resistance to acids and bases

Answer

Polypropylene has excellent resistance to a wide range of acids, bases, and solvents, making it ideal for laboratory and chemical waste drainage.

Question 4

What is the purpose of the 'K' designation in Type K copper tubing?

Accepted Answer

It denotes the thickest wall of the copper types for highest-pressure applications

Answer

Type K has the thickest wall of the three copper types, making it suitable for underground service and higher-pressure applications.

Question 5

A plumber needs to install drain piping in an area exposed to petroleum solvents. Which material is MOST appropriate?

Accepted Answer

Cast iron

Answer

Cast iron is inert to petroleum solvents and provides the best chemical resistance for drain systems exposed to hydrocarbons.

(PC) Plumber Certification Practice Test