30 Questions
What property of metals makes them resistant to failure under shock loads?
Ductility
Which property makes a material more likely to break or crack when exposed to stress?
Brittleness
What type of metals are examples of brittle ferrous metals?
Cast iron and very hard steel
Which property refers to a metal's tendency to return to its original shape after normal stretching and bending?
Elasticity
What is the point beyond which a metal does not return to its original shape after a deforming force is removed?
Elastic limit
Which type of metals have very low elastic limits according to the text?
Non-ferrous metals
What characteristic does tungsten add to steel when it is alloyed with it?
High melting point
Where are tungsten steels typically used due to their high density and retained hardness at elevated temperatures?
Control surface balance weights and breaker contacts in magnetos
What is a key advantage of titanium steel alloys?
High corrosion resistance
Which type of steel is well suited for high-temperature applications like firewalls and exhaust system components?
Stainless steel
Why is pure iron not suitable for use as a structural material?
It is unresponsive to heat treatment
What element is typically alloyed with iron to create steel?
Carbon
What is the main effect of sulphur in steel?
Increases brittleness
How is the negative impact of sulphur in steel countered?
By adding manganese
What role does manganese play in the presence of sulphur in steel?
Combines with sulphur to form a harmless compound
Which element raises the yield strength of steel and improves its resistance to atmospheric corrosion?
Phosphorous
What effect does nickel have on the hardening process of steel when heat-treated?
Slows down the rate of hardening
How does manganese improve a metal's forging characteristics?
By making it less brittle at rolling and forging temperatures
What is a metal's ability to resist being pressed or squeezed?
Compressive strength
Which type of strength relates to a metal's ability to withstand shear stress?
Torsional strength
What is a metal's ability to resist cutting, penetration, or abrasion known as?
Hardness
Which metallic strength refers to the metal's ability to resist repeated loading?
Fatigue strength
What property of steel directly relates to its tensile strength?
Hardness
Which type of strength is related to a metal's ability to resist shock?
Impact strength
What property refers to a metal's tendency to return to its original shape after stretching and bending?
Elasticity
Which property describes a material's ability to resist tearing or breaking when bent or stretched?
Toughness
What does conductivity refer to in metals?
Ability to carry heat or electricity
Which property describes a metal's ability to expand when heated and shrink when cooled?
Thermal Expansion
What characteristic makes a metal a good electrical conductor?
Ability to carry electrons
Which example reflects an application where toughness and hardness are both necessary in metals?
Hammer faces and wrenches
Test your knowledge on stress, strain, yield strength, ultimate strength, and other mechanical properties of materials. Learn about the behavior of materials under different loading forces and their ability to withstand tension, compression, and shear.
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