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5 6 Months > 105 > Flashcards

105 Flashcards

1
Q

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

A

Ductilty, elasticity

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2
Q

Which of the following magnetic materials is an alloy?

A

Alnico

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3
Q

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

A

Melting point; without

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4
Q

An alloy containing iron as the base metal is

A

Steel

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5
Q

Machinability is the speed and ease with which a metal

A

Can be cut on a machine tool

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6
Q

Lead and tin are alloyed in various proportions to make

A

Solder

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7
Q

Lead wool can be used to

A

Form cold welded seals

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8
Q

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

A

Nichrome^

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9
Q

Galvanizing is the process of coating sheet steel with

A

Zinc

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10
Q

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

A

Lard oil

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11
Q

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

A

Yield strength

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12
Q

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

A

42,500 psi

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13
Q

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

A

Creep

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14
Q

The mass of a material per unit volume is called its

A

Density

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15
Q

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

A

Specific gravity

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16
Q

Permanent-mold casting uses

A

Both metal and sand cores

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17
Q

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

A

Centrifugal

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18
Q

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

A

Fastest, nonferrous

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19
Q

Upsetting is the most common method of

A

Cold forging

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20
Q

Pulling rod stock through a tapered die produces

A

Wire

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21
Q

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

A

cast iron, steel

22
Q

Carbon in cast iron generally makes the metal easier to

A

Break

23
Q

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

A

softer, more

24
Q

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

A

High-alloy

25
Q

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

A

Steel

26
Q

The most important element added to iron in making steel is

A

Carbon

27
Q

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

A

Chemical composition, steel

28
Q

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

A

Color, burst

29
Q

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

A

Commercial

30
Q

All stainless steels contain

A

Chromium

31
Q

Uneven heating and cooling of metal parts during welding causes

A

Distortion

32
Q

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

A

cooled slowly

33
Q

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

A

Preheat

34
Q

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

A

Forged, low

35
Q

High-carbon steels contain ______ percent carbon.

A

0.55 to 1.00

36
Q

Copper alloys are made harder by

A

Cold-working

37
Q

Copper alloys that contain lead are relatively ______ to _______

A

Easy, machine

38
Q

What copper alloy contains 36% to 50% zinc?

A

Beta brass

39
Q

Muntz metal is the strongest

A

Brass

40
Q

What copper alloy is most widely used for casting?

A

Ounce metal

41
Q

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

A

Cladding

42
Q

What causes aluminum to lose its strength during welding?

A

Increased temperature

43
Q

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

A

500, 700

44
Q

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

A

Oxide

45
Q

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

A

6

46
Q

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

A

Electrolysis, reduction

47
Q

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

A

AZ

48
Q

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

A

Annealed

49
Q

Magnesium parts should be gas welded

A

Only in emergencies

50
Q

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

A

Titanium, argon

5 6 Months (8 decks)

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