Metals In The Plant

Question 1

A metals ability to be stretched into wire without breaking is called it’s_____ its ability to return to its original shape after being deformed is called its_____

Answer 1

A Ductility; elasticity

Question 2

Which of the following magnetic materials is an alloy?

Answer 2

A Alnico

Question 3

solid and a liquid can exist together at the _____ Adding heat melts more of the solid ______ changing the temperature

Answer 3

D Melting point; without

Question 4

An alloy containing iron as the base metal is

Answer 4

D steel

Question 5

Machinability is the speed and ease with which a metal

Answer 5

B can be cut on a machine tool

Question 6

The maximum amount of stress a material can exert is called it’s

Answer 6

D Yield Strength

Question 7

A standard tensile test specimen exerts a resistance force of 8500 lb. What is the stress in the specimen?

Answer 7

42,500 psi

Question 8

When a metal supports a heavy load at high temperature, It may undergo

Answer 8

A Creep

Question 9

The mass of a material per unit volume is called it’s

Answer 9

A Density

Question 10

The ratio of a material’s density to the density of water is called its

Answer 10

Specific gravity

Question 11

Permanent-mold casting uses

Answer 11

Both metal and sand cores

Question 12

The method of casting metal parts using a spinning mold to force the molten metal away from the center and against the sides of the mold is called _____casting.

Answer 12

A centrifugal

Question 13

Die casting is the____ of all casting methods ____ It is used to cast ____ metals.

Answer 13

fastest; nonferrous

Question 14

Upsetting is the most common method of

Answer 14

A Cold forging

Question 15

Pulling rod stock through a tapered die produces

Answer 15

D wire

Question 16

Because of its higher carbon content _____ has a lower melting point than________

Answer 16

Cast iron; steel

Question 17

Carbon in cast iron generally makes it easier to

Answer 17

break

Question 18

Malleable cast iron is_____ than white cast iron and has_____ resistance to wear than gray cast iron

Answer 18

Softer; more

Question 19

What kind of cast iron is best for parts that must be hard and strong but not brittle?

Answer 19

High- alloy

Question 20

Open-hearth, basic oxygen, and electric are three types of furnaces used for making

Answer 20

Steel

Question 21

The most important element added to iron and making steel is

Answer 21

Carbon

Question 22

AlSI and SAE our number coding systems that specify the
________ of each kind of ______

Answer 22

Chemical composition; steel

Question 23

When spark, testing to identify a steel, you should consider spark length_____ and ______

Answer 23

Color; burst

Question 24

The cold rolled she steel graded____ quality has a matte finish that holds paint well.

Answer 24

Commercial

Question 25

All stainless steels contain

Answer 25

Chromium

Question 26

Uneven, heating and cooling of metal parts during welding causes

Answer 26

Distortion

Question 27

In annealing, a metal should be heated to a temperature above its critical temperature, and then

Answer 27

Cooled slowly

Question 28

Before welding a broken gear, you should______it in order to avoid distortion

Answer 28

Preheat

Question 30

Steels that are____ generally have a_____ carbon content

Answer 30

Forged; low

Question 31

High carbon steel's contain______percent carbon

Answer 31

0.55 to 1.00

Question 32

Copper alloys are made harder by

Answer 32

Cold- working

Question 33

Copper alloy is that contain lead are relatively_____ to ______

Answer 33

Easy machine

Question 34

What copper alloy contains 36% to 50% zinc

Answer 34

Betta brass

Question 35

Muntz metal is the strongest

Answer 35

Brass

Question 36

What copper alloy is most widely used for casting

Answer 36

Ounce metal

Question 37

The process of rolling, a thin layer of aluminum onto a base metal is called

Answer 37

Cladding

Question 38

What causes aluminum to lose its strength during welding

Answer 38

Increase temperature

Question 39

Intermediate temperature, solders, melt and flow at temperatures of____to ______

Answer 39

500;700

Question 40

When aluminum is exposed to the air, a layer of _____ forms on the surface

Answer 40

Oxide

Question 41

In the four-digit aluminum designation number 6053, which digit signifies the main alloying element?

Answer 41

6

Question 43

The two methods of extracting magnesium from brines and ores are_____to______

Answer 43

electrolysis; reduction

Question 44

Which magnesium casting alloys have the lowest yield strength at high temperatures?

Answer 44

AZ (aluminum-zinc)

Question 45

The letter "a" following the designation for a rolled sheet of magnesium stands for...

Answer 45

annealed

Question 46

Magnesium parts should be gas welded...

Answer 46

only in emergencies

Question 47

Typical melting and casting methods cannot be used for __ It can be arc melted using ___gas.

Answer 47

titanium; argon

Question 48

Lead and tin are alloyed in various proportions to make...

Answer 48

solder

Question 49

Lead wool can be used to...

Answer 49

form cold-welded seals

Question 50

Which nickel alloy is commonly used for making heating elements in toasters?

Answer 50

Nichrome

Question 51

Galvanizing is the process of coating sheet steel with...

Answer 51

Zinc

Question 52

Which of the following should you use as a lubricant when machining zinc?

Answer 52

lard oil