105

Question 1

the ability of a metal 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

ductility , 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

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

Answer 6

yield strength

Question 7

a standard tensile test specimen exerts a resistance force of 8500lbs, what is the stress in the specimen

Answer 7

42500 psi

Question 8

when a metal supports a heavy load at high temperatures it may undergo

Answer 8

creep

Question 9

the mass of a material per unit volume is called its

Answer 9

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

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

cold forging

Question 15

pulling rod stock through a tapered die produces

Answer 15

wire

Question 16

because of its higher carbon content cast iron has a lower melting point than ___

Answer 16

steel

Question 17

carbon in cast iron generally makes the metal 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 in making steel is

Answer 21

carbon

Question 22

aisi and saw are number coding systems that specify the __ of each kind of __

Answer 22

chemical compostion, 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 sheet 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 confusion

Answer 28

preheat

Question 29

steels that are ___ generally have a __ carbon content

Answer 29

forged, low

Question 30

high carbon steels contain ___ percent carbon

Answer 30

0.55 to 1.00

Question 31

copper alloys are made harder by

Answer 31

cold working

Question 32

copper alloys that contain lead are relatively ___ to ____

Answer 32

easy, machine

Question 33

what copper alloy contains 36% to 50% zinc

Answer 33

beta brass

Question 34

muntz metal is the strongest

Answer 34

brass

Question 35

what copper alloy is most widely used for casting

Answer 35

ounce metal

Question 36

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

Answer 36

cladding

Question 37

what causes aluminum to lose its strength during welding

Answer 37

increased temperature

Question 38

intermediate temperature solders melt and flow at temperatures of __ to __ degrees

Answer 38

500 , 700

Question 39

when aluminum is exposed to the air a layer of ___ forms on the surface

Answer 39

oxide

Question 40

in the four-digit aluminum designation number 6053 which digit signifies the main alloying element

Answer 40

6

Question 41

the two methods of extracting magnesium from brines and ores are __ and __-

Answer 41

electrolysis, reduction

Question 42

which magnesium casting alloys have the lowest yield strength at high temperatures

Answer 42

AZ

Question 43

the letter “A” following the designation for a rolled sheet of magnesium stands for

Answer 43

annealed

Question 44

magnesium parts should be gas welded

Answer 44

only in emergencies

Question 45

typical melting and casting methods cannot be used for titanium it can be arc melted using ___ gas

Answer 45

argon

Question 46

lead and tin are alloyed in various proportions to make

Answer 46

solder

Question 47

lead wool can be used to

Answer 47

form cold welded seals

Question 48

which nickel alloy is commonly used for making the heating elements in toasters

Answer 48

nichrome

Question 49

galvanizing is the process of coating sheet steel with

Answer 49

zinc

Question 50

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

Answer 50

lard oil