Engineering Materials

Question 1

Resistance to indentation refers to a metals property which
is
a) brittleness
b) elasticity
c) malleability
d) toughness
e) hardness

Answer 1

e) hardness

Question 2

Malleability of a metal

a) will usually decrease as the temperature rises
b) is checked using the Charpy tester
c) means it will crack when struck with a hammer
d) usually increases with the addition of heat
e) means the same as “toughness

Answer 2

d) usually increases with the addition of heat

Question 3

A material that can be drawn out or extended in length
without breakage is said to be
a) hard
b) brittle
c) ductile
d) chilled
e) malleable

Answer 3

c) ductile

Question 4

Materials which will break rather than bend when subjected to
an outside force are said to be
a) tough
b) malleable
c) hard
d) brittle
e) stiff

Answer 4

d) brittle

Question 5

In the process of forming iron, limestone is added to

a) pig iron moulds
b) the iron ore in the moulds
c) the molten iron ore in order to form slag
d) make the resulting pig iron more malleable
e) increase the pig iron elasticity

Answer 5

c) the molten iron ore in order to form slag

Question 6

The result of removing nearly all the impurities and carbon
from pig iron is
a) white cast iron
b) steel
c) low carbon steel
d) coke
e) wrought iron

Answer 6

e) wrought iron

Question 7

Medium carbon steel becomes difficult to weld when the carbon
content exceeds
a) 10%
b) 3.5%
c) 0.35%
d) 0.25%
e) 0.1%

Answer 7

c) 0.35%

Question 8

Pig iron

a) is the raw material from which brass is made
b) has a high percentage of graphite
c) contains at least 2% carbon
d) has most of its carbon in a combined state
e) is the raw material from which cast iron is made

Answer 8

e) is the raw material from which cast iron is made

Question 9

An element which reduces creep in metal is

a) nickel
b) copper
c) vanadium
d) molybdenum
e) manganese

Answer 9

d) molybdenum

Question 10

In order to avoid residual stresses after welding, alloy
steels
a) cannot contain any carbon
b) must contain copper
c) are not affected by carbon content
d) should be heated before, during, and after welding
e) must be heated after welding

Answer 10

d) should be heated before, during, and after welding

Question 11

When nickel is added to alloy steel, it

a) produces increased hardness
b) produces improved machineability
c) causes brittleness
d) produces improved corrosion resistance
e) produces improved elasticity

Answer 11

d) produces improved corrosion resistance

Question 12

When chromium is added to alloy steel it produces

a) increased toughness
b) increased ductility
c) increased hardness
d) improved machineability
e) improved malleability

Answer 12

c) increased hardness

Question 13

Nickel when added to steel

a) improves hardness and brittleness
b) decreases toughness and corrosion resistance
c) improves malleability
d) decreases hardness and brittleness
e) improves toughness and corrosion resistance

Answer 13

e) improves toughness and corrosion resistance

Question 14

An alloy of copper, tin, and sometimes zinc is

a) brass
b) bronze
c) white metal
d) babbit
e) low carbon steel

Answer 14

b) bronze

Question 15

Copper alloys

a) are harder to machine than copper
b) are not as strong as copper itself
c) are less resistant to corrosion than copper
d) are much lower in carbon content than copper
e) are easier to machine than copper itself

Answer 15

e) are easier to machine than copper itself

Question 16

Aluminum is produced from

a) copper and zinc
b) bauxite
c) non-ferrous ore
d) aluminum ore
e) babbit

Answer 16

b) bauxite

Question 17

Aluminum alloys are used in the construction of

a) condenser tubes
b) motor casings
c) internal combustion engine parts
d) bearing shells
e) valves and piping

Answer 17

c) internal combustion engine parts

Question 18

Bismuth, silver and antimony are sometimes found in

a) bearing metals
b) bronze
c) copper
d) brass
e) chrome products

Answer 18

a) bearing metals

Question 19

Relative to bearing metal or babbit, the greater the amount
of lead it contains
a) the greater will be the amount of tin
b) the load it will be able to support will be less
c) the faster the equipment will be able to operate
d) the greater will be the load it will be able to support
e) the less chance it will have of being alloyed with
antimony

Answer 19

d) the greater will be the load it will be able to support

Question 20

Brass is an alloy of

a) copper and bronze
b) copper and lead
c) brass and lead
d) copper and zinc
e) copper and tin

Answer 20

d) copper and zinc

Question 21

Bearing metal

1. is sometimes called babbit metal
2. is sometimes called white metal
3. can be heated to any temperature
4. can be made for different types of service
   a) 1, 2, 3
   b) 2, 3, 4
   c) 1, 3, 4
   d) 1, 2, 4
   e) 3, 4

Answer 21

d) 1, 2, 4

Question 22

Babbit is composed of

a) 75% tin; 15% lead; 10% copper
b) 89% lead; 7.5% tin; 3.5% copper
c) 10% tin; 15% antimony; 75% lead
d) 89% tin; 7.5% lead; 3.5% copper
e) 75% lead; 15% tin; 10% antimony

Answer 22

d) 89% tin; 7.5% lead; 3.5% copper