Unit I-Selection of materials part II

An example of a nanomaterial used in semiconductor devices is:

• Wood fiber

• Graphene

• Plain steel

• Natural rubber

The development of smart and nanomaterials is a focus in:

• Traditional manufacturing

• Advanced research for innovative applications

• Basic construction

• Food processing

The Brinell hardness test measures a material’s resistance to:

• Bending

• Indentation

• Stretching

• Twisting

In the Brinell hardness test, the indenter is a:

• Steel ball

• Diamond cone

• Diamond pyramid

• Rubber probe

The Brinell hardness number (BHN) is calculated based on:

• The depth of indentation

• The diameter of indentation

• The weight of the material

• The length of the material

The Brinell hardness test is best suited for:

• Very soft materials

• Very hard materials

• Materials with coarse surfaces

• Thin materials

The Rockwell hardness test measures hardness by:

• Measuring the depth of penetration

• Measuring the diameter of indentation

• Applying a magnetic force

• Measuring surface roughness

The indenter used in the Rockwell hardness test can be:

• A steel ball or diamond cone

• A rubber ball

• A flat blade

• A cylindrical probe

The Rockwell hardness test is known for being:

• Slow and complex

• Fast and direct

• Inaccurate

• Only for liquids

The Rockwell hardness scale is denoted by letters such as:

• A, B, C

• X, Y, Z

• P, Q, R

• L, M, N