Crystalline Defects Lesson

Multiple Choice

Which two crystal defects are responsible for creating alloys?

• Vacancy and interstitial

• interstitial and substitutional

• Vacancy and subsitutional

• line and interstitial

Multiple Choice

An interstitial defect is when ___________.

• a unit cell is missing from the repeating arrangement

• a unit cell is replaced in the repeating arrangement

• a new unit cell is placed in between two unit cells in the repeating arrangement

Multiple Choice

Imagine a deck of cards where only one card is sticking out from the rest of the deck. This is a visual example of a ______ defect.

• line

• interfacial

• point

• substitutional

Multiple Choice

Which type of defect is shown in the image?

• point defect

• line defect

• interfacial defect

• vacancy defect

Multiple Choice

The image shown to the left is the

• vacancy defect

• interfacial defect

• substitutional defect

• interstitial defect

Multiple Choice

The image to the left identifies

• substitutional defect

• interstitial defect

• interfacial defect

• vacancy defect

Multiple Choice

This an example of brass, which is an alloy. What kind of defect is responsible for creating brass?

• interstitial

• substitutional

• vacancy

• interfacial

Multiple Choice

Grain boundary is a

• point defect
• surface defect
• line defect
• none

Multiple Choice

Grain boundary is a

• point defect
• surface defect
• line defect
• none

Multiple Choice

This test applies pulling force to a material and measures the specimen's response to the stress.

• Tensile test

• Harness test

• Impact test

Multiple Choice

You grab a plastic bag stretching it until it breaks.  What type of stress strain behavior would resist this?

• tensile strength
• abrasion resistance
• puncture resistance
• none of options listed

Multiple Choice

Concrete is exceptionally high in compression strength but relatively weak in _______________ strength, because it can easily be pulled apart.

• tensile

• creep

• fracture

• hardnes

Multiple Choice

An investigation confirmed excess weight on a weak material was the reason for the system collapsing. The information derived from a _ test.

• torsion

• tensile

• compression

• fatigue

Multiple Choice

Why is 'welded wire' or 'wire mesh' added to concrete ?

• It keeps it from getting too heavy

• It helps to manage households pests

• It adds tensile strength to the concrete

• Its makes the concrete have a smooth finish

Multiple Choice

If you apply a force to deform a material then remove the force and the material returns to its original shape this is

• elastic deformation

• plastic deformation

• inelastic deformation

• unplastic deformation

Multiple Choice

If you apply a force to deform a material then remove the force and the material does not return to its original shape this is

• elastic deformation

• plastic deformation

• rubber deformation

• unplastic deformation

Multiple Select

Non destructive testing is used

• on products in use

• on products not in use

• when you don't want to damage the material

• when you need to damage the material

Multiple Select

Destructive testing is used

• on products in use

• on products not in use

• when you don't want to damage the material

• when you need to damage the material

Multiple Choice

What is the Youngs Modulus if a stress of 25MPa causes a strain of 0.003?

• 8x10⁹ Pa

• 8x10⁶ Pa

• 8x10³ Pa

• 8x10^-3 Pa

Multiple Choice

The ratio of stress and .......... strain is called Young's modulus

• volume

• tensile

• width

Multiple Choice

Complete the formula , Y = F L_° /.........

• F A ∆ L

• F ∆ L

• A ∆ L

Multiple Choice

Unit of Young's modulus is .............

• Nm

• N/m²

• N

Multiple Choice

What below best describes the term quenching?

• is the rapid cooling of a workpiece in water, oil or air to obtain certain material properties

• when subjected to stress, it breaks without significant plastic deformation

• is the ability of a solid to bend or be hammered into other shapes without breaking.

• is a heat treatment technique applied to ferrous alloys, such as steel or cast iron, to achieve greater toughness by decreasing the hardness of the alloy.

Multiple Choice

What below best describes the term annealing?

• is the rapid cooling of a workpiece in water, oil or air to obtain certain material properties

• when subjected to stress, it breaks without significant plastic deformation

• is the ability of a solid to bend or be hammered into other shapes without breaking.

• is a heat treatment that alters the physical and sometimes chemical properties of a material to increase its ductility and reduce its hardness, making it more workable.

Multiple Choice

What process is happening in this image?

• annealing

• hardening

• forging

• Quenching

Multiple Choice

What process is happening in this image?

• annealing

• hardening

• forging

• Quenching

Multiple Choice

What process is happening in this image?

• annealing

• hardening

• forging

• Quenching

Multiple Choice

What is this tool or equipment called?

• Tongs

• Pliers

• Long nose pliers

• Long clamps