EMP Revision 1

What is a characteristic of non-destructive testing?

• Tested parts are destroyed during testing

• It provides direct measurement of how a material responds to service conditions

• It can be performed on parts that are in service

• It does not require interpretation of results by skilled operators

Which of the following is an advantage of destructive testing?

• It can be performed on 100% of production lot

• It provides quantitative results useful for design

• Little or no specimen preparation is required

• Different tests can be applied to the same item

What are the two different types of material testing that you know?

• Invasive and Non-invasive

• Mechanical and Chemical

• Destructive and Non-destructive

• Physical and Structural

Why are materials and components tested in laboratories and industries?

• To determine their cost

• To determine their special properties

• To make them stronger

• To change their color

What is a characteristic of non-destructive testing?

• Tested parts are destroyed during testing

• It provides direct measurement of how a material responds to service conditions

• It can be performed on parts that are in service

• It does not require interpretation of results by skilled operators

Which of the following is NOT mentioned as a reason for the importance of testing materials?

• To determine the properties of the material

• To check quality at intermediate stages in production process

• To increase the sale value of the material

• To aid research

What is hardness defined as in materials science?

• The ability to resist corrosion

• The ability to resist indentation, scratching, and wear

• The ability to conduct electricity

• The ability to resist heat

Why is the Brinell test considered effective for irons and steels?

• It measures hardness over a relatively large area

• It can be used on very hard materials

• It doesn't require any special equipment

• It can be used on very thin specimens

If a material has a Brinell hardness number of 250, what would its approximate Rockwell C number be?

• 15

• 25

• 35

• 45

When would you choose to use the Rockwell superficial hardness test instead of the standard Rockwell test?

• For very thick materials

• For rough surfaces

• For thin materials or when a shallow indentation is desired

• For materials with high hardness values