Materials Review

When a steel bar rusts, which property remains the same?

• Stress

• Strength

What is a typical density for normal weight concrete?

• 1500-2000 kg/m3

• 2000-2500 kg/m3

• 2500-3000 kg/m3

• 2500-3000 kg/m2

What type of failure does concrete experience?

• Brittle

• Ductile

If the aggregates are rounded and smooth:

• There is no need to change the water content

• The water content needs to increase

• The water needs to decrease

If the aggregates are coarse, does the Fineness Modulus:

• Decrease

• Increase

• Stay the same

Adding Molybdenum to steel will result in which of the following:

• Promotes an austenitic structure

• Improves high-temperature strength

• Increases toughness

• Restricts grain growth

Adding sulfur to steel will result in which of the following:

• Increase toughness

• Improves high temperature strength

• Adds machinability

• Promotes grain refinement

When the yield strength is not well defined, what method is used to approximate it for aluminium?

• 0.2% extension method

• 0.5% extension method

• 0.5% offset method

• 0.2% offset method

Poisson's ratio is defined as:

• Lateral strain/longitudinal strain

• Longitudinal strain/lateral strain

In steel, if the grain size is smaller:

• The strength increases

• The strength decreases

• Toughness decreases

• There will be more plastic deformation