CAR Material Selection & Properties 2

Question 1

Which property makes copper tubing in refrigerators particularly valuable during recycling?

Accepted Answer

High corrosion resistance and conductivity

Answer

Low melting point for easy processing

Answer

Magnetic properties for easy separation

Answer

High density for compact storage

Question 2

What is the primary concern when recycling appliances containing polyurethane foam insulation?

Accepted Answer

Foam may contain ozone-depleting blowing agents that must be recovered

Answer

The foam is too heavy to transport

Answer

Polyurethane cannot be recycled at all

Answer

The foam dissolves in water during processing

Question 3

Which appliance component is most likely to contain mercury and requires special handling?

Accepted Answer

Thermostat switches and relays

Answer

Compressor oil

Answer

Plastic door gaskets

Answer

Stainless steel drum

Question 4

Galvanized steel in appliances is coated with which material to prevent corrosion?

Accepted Answer

Zinc

Answer

Chromium

Answer

Nickel

Answer

Tin

Question 5

What distinguishes Type 304 stainless steel commonly found in dishwashers from carbon steel?

Accepted Answer

It contains 18% chromium and 8% nickel alloy additions

Answer

It is coated with a plastic film for corrosion resistance

Answer

It has a higher carbon content than regular steel

Answer

It is non-metallic and cannot be magnetized

Question 6

Which plastic resin code is commonly found on polypropylene washing machine tubs?

Accepted Answer

#5 (PP)

Answer

#1 (PET)

Answer

#2 (HDPE)

Answer

#7 (Other)

Question 7

During appliance shredding, eddy current separators are used to recover which material?

Accepted Answer

Non-ferrous metals like aluminum

Answer

Ferrous metals like iron and steel

Answer

Glass and ceramics

Answer

Plastic polymers