105

Question 1

A metal’s ability to be stretched into wire without breaking is called its ____. Its ability to return to its original shape after being deformed is called its

Answer 1

Ductilty, elasticity

Question 2

Which of the following magnetic materials is an alloy?

Answer 2

Alnico

Question 3

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

Answer 3

Melting point; without

Question 4

An alloy containing iron as the base metal is

Answer 4

Steel

Question 5

Machinability is the speed and ease with which a metal

Answer 5

Can be cut on a machine tool

Question 6

Lead and tin are alloyed in various proportions to make

Answer 6

Solder

Question 7

Lead wool can be used to

Answer 7

Form cold welded seals

Question 8

Which nickel alloy is commonly used for making the heating elements in toasters? (^®Invar and Monel are trade names of the International Nickel Co.)

Answer 8

Nichrome^

Question 9

Galvanizing is the process of coating sheet steel with

Answer 9

Zinc

Question 10

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

Answer 10

Lard oil

Question 11

The maximum amount of stress a material can exert is called its

Answer 11

Yield strength

Question 12

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

Answer 12

42,500 psi

Question 13

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

Answer 13

Creep

Question 14

The mass of a material per unit volume is called its

Answer 14

Density

Question 15

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

Answer 15

Specific gravity

Question 16

Permanent-mold casting uses

Answer 16

Both metal and sand cores

Question 17

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 17

Centrifugal

Question 18

Die casting is the ______ of all casting methods. It is used to cast ______ metals

Answer 18

Fastest, nonferrous

Question 19

Upsetting is the most common method of

Answer 19

Cold forging

Question 20

Pulling rod stock through a tapered die produces

Answer 20

Wire

Question 21

Because of its higher carbon content, ______ has a lower melting point than _______.

Answer 21

cast iron, steel

Question 22

Carbon in cast iron generally makes the metal easier to

Answer 22

Break

Question 23

Malleable cast iron is ____ than white cast iron and has _____ resistance to wear than gray cast iron.

Answer 23

softer, more

Question 24

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

Answer 24

High-alloy

Question 25

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

Answer 25

Steel

Question 26

The most important element added to iron in making steel is

Answer 26

Carbon

Question 27

AISI and SAE are number coding systems that specify the _____ of each kind of ____.

Answer 27

Chemical composition, steel

Question 28

When spark testing to identify a steel, you should consider spark length, _______, and ________.

Answer 28

Color, burst

Question 29

The cold-rolled sheet steel graded ______ quality has a matte finish that holds paint well.

Answer 29

Commercial

Question 30

All stainless steels contain

Answer 30

Chromium

Question 31

Uneven heating and cooling of metal parts during welding causes

Answer 31

Distortion

Question 32

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

Answer 32

cooled slowly

Question 33

Before welding a broken gear, you should ________ it in order to avold distortion.

Answer 33

Preheat

Question 34

Steels that are _____ generally have a ______ -carbon content.

Answer 34

Forged, low

Question 35

High-carbon steels contain ______ percent carbon.

Answer 35

0.55 to 1.00

Question 36

Copper alloys are made harder by

Answer 36

Cold-working

Question 37

Copper alloys that contain lead are relatively ______ to _______

Answer 37

Easy, machine

Question 38

What copper alloy contains 36% to 50% zinc?

Answer 38

Beta brass

Question 39

Muntz metal is the strongest

Answer 39

Brass

Question 40

What copper alloy is most widely used for casting?

Answer 40

Ounce metal

Question 41

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

Answer 41

Cladding

Question 42

What causes aluminum to lose its strength during welding?

Answer 42

Increased temperature

Question 43

Intermediate-temperature solders melt and flow at temperatures of ____ to _____° F

Answer 43

500, 700

Question 44

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

Answer 44

Oxide

Question 45

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

Answer 45

6

Question 46

The two methods of extracting magnesium from brines and ores are _____ and ______

Answer 46

Electrolysis, reduction

Question 47

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

Answer 47

AZ

Question 48

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

Answer 48

Annealed

Question 49

Magnesium parts should be gas welded

Answer 49

Only in emergencies

Question 50

Typical melting and casting methods cannot be used for ______. It can be arc melted using _____ gas

Answer 50

Titanium, argon