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IMSE 250 Quizzes 2-9 (1)
IMSE 250 Quizzes 2-9 (1)
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IMSE 250 Quizzes 2-9Both steels and cast iron are iron-carbon alloys. T/F - ANS-True
Both brasses and bronzes contain copper. T/F - ANS-True
Generally speaking, ceramic materials have ________ thermal conductivity than metals.
a. lower
b. higher - ANS-lower
Generally speaking, metals have _______ thermal conductivity than plastics.
a. lower
b. higher - ANS-Higher
Generally speaking, the melting point of ceramics is _______ than that of metals.
a. lower
b. higher - ANS-higher
On Boeing 787 airplanes, which type of material is used the most?
a. metal
b. plastics
c. ceramics
d. composites - ANS-Composites
On Boeing 787 airplanes, about _____ of all materials used are composites?
a. 5%
b. 25%
c. 50%
d. 75% - ANS-50%
In the past three decades, US composites shipment has _________.
a. decreased
b. increased - ANS-increased
Density is part of _______
a. mechanical properties.
b. physical properties. - ANS-physical properties
If we let the young's modulus of AISI steel by 1, which value will most likely be the young's
modulus of plastic?
a. 0.1
b. 1
, c. 10 - ANS-0.1
Can the young's of a material be greatly changed by manufacturing processes?
a. yes
b. no - ANS-no
Can the yield strength of a material be greatly changed by manufacturing processes?
a. yes
b. no - ANS-yes
If we let the tensile strength of AISI 4140 steel be 1, which value will most likely be the tensile
strength of ceramics?
a. 0.5
b. 5
c. 50 - ANS-0.5
Can the ductility of a material be greatly changed by the manufacturing process?
a. yes
b. no - ANS-yes
Please refer to the figure on the right (#7 on quiz #3)
Which material has lower elastic modulus?
Which material has lower yield strength?
Which material has lower tensile strength?
Which material is less ductile?
Which material has lower toughness? - ANS-B
B
B
A
A
Generally speaking, as tensile strength increases, hardness _________
a. increases
b. decreases - ANS-increases
A material can have many fatigue strength values. There is a fatigue strength value for every
number of loading cycles. However a material has just one endurance strength value.
a. true
b. false - ANS-true
When the applied load is below the endurance strength, the material will never fail regardless of
the number of loading cycles.
a. true
b. false - ANS-true
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