Materials ( 110101j )

Question 1

Brittleness in a metal is what?

Answer 1

The ability to withstand distortion materials like glass, cast iron are considered brittle as they will shatter easily

Question 2

How is a metal conductive?

Answer 2

Most metals are good conductors when they permit the flow of heat or electricity through them easily

Question 3

What is metal ductility?

Answer 3

A metal that has the ability to withstand stretching, bending or twisting past its elastic limit without breaking or losing any other mechanical properties

Question 4

What is metal elasticity?

Answer 4

Elasticity is the tendency of a metal to return to its original shape after it has been deformed

Question 5

What is hardness in a metal?

Answer 5

Hardness is the ability of a metal to resist forces that tend to push the molecules apart

Question 6

When a metal is malleable how is it described?

Answer 6

It can easily be drawn out by hammering or when forces are applied

Question 7

What is strength of a metal?

Answer 7

The amount of high, steady stress a metal can withstand before it yields

Question 8

What are 3 categories of heat treating?

Answer 8

Annealing
Quenching
Tempering

Question 9

What is annealing?

Answer 9

A process used to release internal stresses in a hardened metal

Question 10

What is quenching?

Answer 10

Quenching is a process that involves rapid cooling of a metal that is heated by immersion in a medium such as water or oil

Question 11

What is oxidation?

Answer 11

The result of a metal that is exposed to oxygen in the atmosphere

Question 12

What is a ferrous metal?

Answer 12

Metal that contains iron contents like mild steel

Question 13

What is a non ferrous metal?

Answer 13

Metal that does not have iron in it
Like aluminum or copper

Question 14

What are some pure metals?

Answer 14

Gold, silver, aluminum these metals are pure

Question 15

What is an alloy?

Answer 15

Alloy metals are combination metals that have 2 or more metals

Question 16

What is expanded metal?

Answer 16

Metal that is formed from slitting and expanding diamond shapes

Question 17

What is perforated metal?

Answer 17

Solid sheets with holes punched in.
The holes can be round, square, or other patterns

Question 18

What is most common name for hardware cloth?

Answer 18

Birdscreen, it is a wire mesh to cover openings against the entry of unwanted pests

Question 19

What is galvanic action?

Answer 19

This is a corrosive process that results when dissimilar metals come into contact with an electrolytes such as moisture

Question 20

What is one way to prevent galvanic action?

Answer 20

To provide a barrier between the two metals

Question 21

What is the gauge of metal?

Answer 21

The thickness

Question 22

What metal must not be used on any food equipment?

Answer 22

Zinc coated metal because the zinc and its compounds are poisonous

Question 23

What is galvalume used for?

Answer 23

The outer wall of B-vent and L-vent chimney and fittings

Question 24

What is an advantage of stainless steel?

Answer 24

A high resistance to heat and corrosion

Question 25

What is a disadvantage of stainless steel?

Answer 25

Because of their high tensile strength they are more difficult to work with.

Question 26

What is one advantage of aluminum?

Answer 26

It is lightweight weighing about one third the weight of steel

Question 27

What are some common uses of aluminum?

Answer 27

Aluminum has many uses including automotive, aerospace and marine industries. Aluminum foil in the packaging industry as well as soda cans and cooking utensils

Question 28

What is copper?

Answer 28

A reddish brown metal that is considered an element. It hardens when it is cold worked and is extremely tough

Question 29

What are some advantages of copper?

Answer 29

It is an excellent conductor of heat and electricity. Because it's oxides protect it from further oxidation it is a long lasting metal

Question 30

What are advantages of brass?

Answer 30

Brass is highly malleable and are easily cast, forged, rolled and pressed.

Question 31

What are two basic categories of plastics?

Answer 31

Thermosetting Thermoplastic

Question 32

What are thermosetting plastics?

Answer 32

Thermosetting plastics harden under heat such as vulcanized rubber, silicone

Question 33

What are thermoplastic materials?

Answer 33

Materials that soften when heated and solidify when cooled

Question 34

Where is PVC pipe used?

Answer 34

To vent high efficiency furnaces. For corrosive fume exhaust systems

Question 35

What is toughness in a metal?

Answer 35

The ability to withstand an impact load

Question 36

What is no 4 stainless steel?

Answer 36

A stain finish on one side used for restaurant, kitchen etc

Question 37

How is aluminum obtained?

Answer 37

From an ore called bauxite

Question 38

What is the formula for an inside diameter measurement?

Answer 38

Add 20 percent of the material thickness to the side of the bend line ( in add 20)

Question 39

What is the formula for an outside diameter measurement?

Answer 39

Subtract 80 percent of the metal thickness on all sides of the bend ( out sub 80)

Question 40

How is copper gauged?

Answer 40

By the weight in ounces per square foot