MMET 207 Exam 3 Questions With
Correct Answers
Austenitic stainless steels can be hardened by heat treatment, cold
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worked or both to improve tensile strength and hardness. - CORRECT
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ANSWER✔✔-True
Graphite flakes can be seen in the surface of unetched gray cast irons -
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CORRECT ANSWER✔✔-True |
An increase in the number of graphite flakes in gray cast irons
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corresponds to: - CORRECT ANSWER✔✔-An increase in castability
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Cast steels have higher mechanical properties than all of the cast irons
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except grey cast iron. - CORRECT ANSWER✔✔-False
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What is a major design concern for anodizing parts for wear resistance?
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- CORRECT ANSWER✔✔-Size change - part getting bigger after
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anodizing
Aluminum is magnetic at low temperatures and non-toxic. - CORRECT
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ANSWER✔✔-False
, What is the first step of precipitation hardening - CORRECT
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ANSWER✔✔-Furnace solution heat treating | | |
Many free machining stainless steels have nitrogen added to improve
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metal chip removal. - CORRECT ANSWER✔✔-False
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Solidification shrinkage can lead to cracks and high stresses in cast irons.
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- CORRECT ANSWER✔✔-True
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The secant modulus is used to determine the modulus of elasticity of
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gray cast irons. - CORRECT ANSWER✔✔-True
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Silicon improves the fluidity of molten metals except aluminum -
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CORRECT ANSWER✔✔-False |
Austenitic stainless steels have 50% higher thermal conductivity than
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carbon steels. - CORRECT ANSWER✔✔-False
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Which cast iron is recommended for extreme wear conditions and
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excellent abrasion resistance - CORRECT ANSWER✔✔-White
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Correct Answers
Austenitic stainless steels can be hardened by heat treatment, cold
| | | | | | | | | |
worked or both to improve tensile strength and hardness. - CORRECT
| | | | | | | | | | |
ANSWER✔✔-True
Graphite flakes can be seen in the surface of unetched gray cast irons -
| | | | | | | | | | | | | |
CORRECT ANSWER✔✔-True |
An increase in the number of graphite flakes in gray cast irons
| | | | | | | | | | | |
corresponds to: - CORRECT ANSWER✔✔-An increase in castability
| | | | | | |
Cast steels have higher mechanical properties than all of the cast irons
| | | | | | | | | | | |
except grey cast iron. - CORRECT ANSWER✔✔-False
| | | | | |
What is a major design concern for anodizing parts for wear resistance?
| | | | | | | | | | |
- CORRECT ANSWER✔✔-Size change - part getting bigger after
| | | | | | | | | |
anodizing
Aluminum is magnetic at low temperatures and non-toxic. - CORRECT
| | | | | | | | | |
ANSWER✔✔-False
, What is the first step of precipitation hardening - CORRECT
| | | | | | | | | |
ANSWER✔✔-Furnace solution heat treating | | |
Many free machining stainless steels have nitrogen added to improve
| | | | | | | | | |
metal chip removal. - CORRECT ANSWER✔✔-False
| | | | |
Solidification shrinkage can lead to cracks and high stresses in cast irons.
| | | | | | | | | | |
- CORRECT ANSWER✔✔-True
| | |
The secant modulus is used to determine the modulus of elasticity of
| | | | | | | | | | | |
gray cast irons. - CORRECT ANSWER✔✔-True
| | | | |
Silicon improves the fluidity of molten metals except aluminum -
| | | | | | | | | |
CORRECT ANSWER✔✔-False |
Austenitic stainless steels have 50% higher thermal conductivity than
| | | | | | | | |
carbon steels. - CORRECT ANSWER✔✔-False
| | | |
Which cast iron is recommended for extreme wear conditions and
| | | | | | | | | |
excellent abrasion resistance - CORRECT ANSWER✔✔-White
| | | | |
