120102c Metal Identification

Question 1

A ferrous metal has a high content of:
a) carbon.
b) nickel.
c) iron.
d) manganese.

Answer 1

c) iron.

Question 2

Which statement describes a non-ferrous metal?
a) high iron content and usually magnetic
b) high iron content and usually non-magnetic
c) contains little or no iron and is usually magnetic
d) contains little or no iron and is usually non-magnetic

Answer 2

d) contains little or no iron and is usually non-magnetic

Question 3

A metal that is red or yellow is most likely what type of metal?
a) aluminum or magnesium
b) malleable cast iron
c) low or medium carbon steel
d) copper or brass

Answer 3

d) copper or brass

Question 4

What is the normal colour for steels and cast irons?
a) silvery grey
b) black
c) yellow
d) red

Answer 4

a) silvery grey

Question 5

If a metal that has fractured shows a dull grey appearance in its internal structure, with no bending before breaking, it is most likely:
a) high carbon steel.
b) malleable cast iron.
c) grey east iron.
d) pure aluminum.

Answer 5

c) grey east iron.

Question 6

Given two identical pieces of zinc die cast and aluminum, what would be the simplest way to identify them?
a) flame test
b) spark test
c) by their colour
d) by their weight

Answer 6

d) by their weight

Question 7

If an object is irregularly shaped, what might you conclude about the object?
a) It is aluminum.
b) It is a casting.
c) It is heat-treated.
d) It is ductile.

Answer 7

b) It is a casting.

Question 8

If a piece of metal has a smooth outer surface, what might you conclude about the object?
a) It has been formed.
b) It is a casting.
c) It is high carbon steel.
d) It is magnetic.

Answer 8

a) It has been formed.

Question 9

In using a chip test to identify a metal, what would a smooth continuous chip
indicate?
a) a dull chisel
b) a soft material like aluminum
c) a hard material like high carbon steel
d) a brittle material like cast iron

Answer 9

b) a soft material like aluminum

Question 10

How can using a new hand-held file give you an estimate of a metal’s hardness?
a) If you tap the metal with the file, hardened tool steel will not ring.
b) If the file bites into the metal easily, it is likely a hard material.
c) If the file bites into the metal easily, it is likely a soft material.
d) If the metal is harder than the file, the file bites in easily.

Answer 10

c) If the file bites into the metal easily, it is likely a soft material.

Question 10

How is cast iron distinguished from low carbon steel in a spark test?
a) The sparks given off by cast iron are in yellowish straight streaks.
b) The sparks given off by low carbon steel are short with red bursts near the
grinder.
c) The sparks look the same, but more pressure is required with carbon steel.
d) The sparks given off by cast iron are short with red bursts near the grinder.

Answer 10

d) The sparks given off by cast iron are short with red bursts near the grinder.

Question 11

What is the approximate hardness rating of low carbon steel on the Brinell Hardness scale?
a) 100
b) 300
c) 500
d) 600

Answer 11

a) 100

Question 12

Which metal will burn violently when ignited using the flame test?
a) copper
b) nickel
c) aluminum
d) magnesium

Answer 12

d) magnesium

Question 13

When the heat code identification number is cut from a piece of plate, what should you do?
a) Notify the supervisor.
b) Transfer the ID number to the remaining plate.
c) Check the hardness of the remaining plate.
d) Discard the mill test report.

Answer 13

b) Transfer the ID number to the remaining plate.

Question 14

What is the most precise method for the identification of a metal that has been shipped from a steel mill?
a) Study the mill test report.
b) Use a file for hardness testing.
c) Do a spark test with an angle grinder.
d) Steel that comes in shapes is always low carbon.

Answer 14

a) Study the mill test report.

Question 15

In addition to the mill test report, what else do steel mills usually attach to the straps that hold bundles of bar stock together?
a) colour coded material size tags
b) date of manufacture tags
c) metal specification tags
d) an MSDS

Answer 15

c) metal specification tags

Question 16

This term describes the resistance of a material to a force that tends to deform or cause failure by crushing.
a) shear strength
b) compressive strength
c) endurance limit
d) tensile strength

Answer 16

b) compressive strength

Question 17

The maximum load required to punch through a metal is used to determine the:
a) toughness.
b) compressive strength.
c) shear strength.
d) malleability.

Answer 17

c) shear strength.

Question 18

Which term describes the resistance of a material to a force that is trying to pull it apart?
a) tensile strength
b) yield strength
c) ductility
d) elasticity

Answer 18

a) tensile strength

Question 19

Which term describes the ability of a metal to be cold worked without a great deal of resistance?
a) elasticity
b) toughness
c) brittleness
d) malleability

Answer 19

d) malleability

Question 20

Which term describes a material that shows no permanent distortion before failure?
a) brittleness
b) hardness
c) toughness
d) elasticity

Answer 20

a) brittleness

Question 21

Which term describes the ability of a metal to resist indentation or penetration?
a) brittleness
b) hardness
c) toughness
d) malleability

Answer 21

b) hardness

Question 22

Which term describes the ability of a metal to withstand the shock of a rapidly applied load?
a) malleability
b) hardness
c) toughness
d) elasticity

Answer 22

c) toughness

Question 23

This term describes the ability of a metal to return to its original shape after a load has been removed.
a) elasticity
b) malleability
c) toughness
d) ductility

Answer 23

a) elasticity

Question 24

The point at which permanent deformation takes place is known as the:
a) tensile strength.
b) yield strength.
c) compressive strength.
d) shear strength.

Answer 24

b) yield strength.

Question 25

Which term describes the ability of a metal to withstand a sharp, high-velocity blow?
a) impact strength
b) yield strength
c) compressive strength
d) tensile strength

Answer 25

a) impact strength

Question 26

Density is defined as weight per unit volume. What is the density of steel?
a) 0.283 Ib/in
b) 0.283 Ib/in2
c) 0.283 Ib/in3
d) 0.283 Ib/gal

Answer 26

c) 0.283 Ib/in3

Question 27

Which term describes the ability of a metal to resist wasting away by slow gradual combination with other elements and chemical compounds?
a) electrical resistance
b) thermal expansion
c) corrosion resistance
d) stress relieving

Answer 27

c) corrosion resistance

Question 28

Which term describes the rate at which electric current flows through a metal?
a) electrical conductivity
b) electrical resistance
c) electrical short circuit
d) electrical variability

Answer 28

a) electrical conductivity

Question 29

Which term describes the rate at which heat flows through a metal?
a) thermal expansion
b) thermal conductivity
c) electrical conductivity
d) transition temperature

Answer 29

b) thermal conductivity

Question 30

Which term describes the extent of increase in physical dimensions due to a change in the metal’s temperature?
a) thermal conductivity
b) transition temperature
c) electrical expansion rate
d) thermal expansion rate

Answer 30

d) thermal expansion rate

Question 31

The temperature at which a metal changes to liquid form is called its:
a) melting point.
b) density.
c) transition temperature.
d) thermal conductivity.

Answer 31

a) melting point.