Material Selection & Properties Flashcards
7 cards from real PC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Material Selection & Properties flashcards as text
Which pipe material requires a primer before applying solvent cement to make a proper joint?
Answer: Both PVC and CPVC
Both PVC and CPVC require a purple or clear primer to soften and clean the pipe surface before solvent cement is applied to form a proper chemical weld.
What is 'dezincification' and which material is most susceptible to it?
Answer: Selective leaching of zinc from brass alloys in aggressive water; standard brass fittings are most susceptible
Dezincification is the selective leaching of zinc from brass, leaving a porous copper residue; it is prevented by using dezincification-resistant (DZR) brass fittings.
Which material is approved for use in wet venting applications under the International Plumbing Code?
Answer: Copper, PVC, ABS, and other listed materials meeting the code's requirements
The IPC permits wet venting using any pipe material that is listed and approved for both drain and vent service, including copper, PVC, and ABS.
When installing underground plastic drain pipe, which bedding material is required beneath and around the pipe?
Answer: Crushed stone or granular fill free of sharp objects
Plastic pipe requires crushed stone or clean granular bedding material free of sharp rocks to prevent point loading and pipe deflection under backfill weight.
Which pipe material is commonly used for natural gas distribution mains buried underground because it is corrosion-resistant and can be fused without fittings?
Answer: Polyethylene (PE) gas pipe
Polyethylene gas pipe is widely used for underground gas distribution because it resists corrosion and can be heat-fused into a continuous, joint-free line.
What does NSF/ANSI 61 certification indicate for a plumbing product?
Answer: The product has been tested and certified to not leach harmful contaminants into drinking water
NSF/ANSI 61 is the standard for drinking water system components, certifying that the material does not leach contaminants above acceptable health thresholds.
Which joining method is used for copper press-connect fittings and what tool is required?
Answer: A hydraulic press tool that crimps a fitting sleeve permanently onto the pipe
Press-connect copper fittings use a hydraulic press tool to permanently deform a fitting sleeve around the pipe, creating a water-tight mechanical joint without heat.