Chapter 2 Metals

Which of these temper designations indicates "strain hardened and partially annealed"?

-H2

Which of these items should you keep in mind when choosing substitute metal for use in aircraft repair?

-Maintaining the original strength of the structure -Maintaining the original weight -Maintaining contour or aerodynamic properties

Quantitative inspection of metals includes:

-Mechanical properties -Dimensional requirement -Chemical composition

Which of these temper designations indicates "solution heat treated and then artificially aged"?

-T6

An aluminum/silicon alloy is denoted by which series number?

4000

If a bolt were installed in a hole that was too large, and the head was pulled through the material when torque was applied, it means that what measure of strength of the material was insufficient?

Bearing strength

Metal that allows for little bending or forming without shattering is called what?

Brittle

This property of metal enables it to return to its natural shape.

Elasticity

The ability of a metal to resist abrasion, penetration, cutting action, or permanent distortion is called what?

Hardness

Nickel steels are primarily used in which aircraft parts?

Hardware, like nuts and bolts

Which of these is not a common method of carburizing steel?

Instant carburizing

When hardening carbon steel, it must be cooled to below 1,000°F within what time limit?

Less than 1 second

To measure the hardness of precision work pieces that are too small to be measured by other tests, you could use:

Microhardness testing

Which of these is a nickel alloy?

Monel

Which of these is not a standard method of quenching heated metal?

Oil-based quenching

Generally speaking, which of these is an advantage of ferrous metals over nonferrous metals?

Only ferrous metals can be normalized

One method of testing the hardness of metals involves measuring the depth of penetration of a diamond cone or a hardened steel ball under pressure into the metal. It is called the:

Rockwell Hardness Testing System

Which of the following is not a metal commonly alloyed with magnesium?

Silver

What type of strength is measured by the resistance of a material to a force that would tend to pull it apart?

Tensile strength

Which hardness testing system looks like a set of pliers with a dial attached?

Webster Hardness Gauge

The point at which a load would cause an initial indication of a permanent distortion is called:

Yield strength

Which of these is not a property of aluminum that makes it advantageous in modern aircraft construction?

Contains steel

If an aluminum alloy sheet has undergone cladding with pure aluminum, and its thickness is 0.050", how thick is the cladding on each side?

0.0025"

Which of these thickness measurements is outside of the normal range for aluminum alloys used in small aircraft construction?

0.166"

Aluminum alloys become liquid at approximately what temperature?

1,250°F