Rockwell Hardness Test Quiz

What is the primary purpose of the Rockwell Hardness Test?

• To measure the color of a material

• To determine the weight of a material

• To calculate the temperature of a material

• To measure the permanent depth of indentation

What type of indenter is used in the Rockwell Hardness Test Scale C?

• A steel ball

• A rounded cone made of diamond

• A flat plate

• A cylindrical rod

What is the minor force applied in the first step of the Rockwell Hardness Test?

• 100 kilo pawns

• 10 kilo pawns

• 50 kilo pawns

• 20 kilo pawns

How much is the test force increased by in the second step of the Rockwell Hardness Test?

• 100 kilo pawns

• 200 kilo pawns

• 140 kilo pawns

• 50 kilo pawns

What is the formula for calculating Rockwell Hardness HRC?

• HRC = 0.1 - permanent depth of indentation in millimeters times 600

• HRC = 0.3 - permanent depth of indentation in millimeters times 400

• HRC = 0.5 - permanent depth of indentation in millimeters times 200

• HRC = 0.2 - permanent depth of indentation in millimeters times 500

What is the first step in setting up the testing machine?

• Adjusting the test piece

• Rotating the microscope lens

• Installing the conical diamond indenter

• Picking up the gear wheel

What should be done after placing the gear wheel on the support table?

• Increase the test force

• Rotate the microscope lens to its vertical position

• Start the test immediately

• Remove the gear wheel

What indicates that the surface of the test piece is at the correct height?

• The test piece starts to move

• The focused image can be seen on the screen

• The machine beeps

• The test piece changes color

Why is the Rockwell Hardness Test often used in automated production lines?

• Because it is very slow

• Because it requires manual operation

• Because it is fully automated

• Because it is very expensive

What was the Rockwell Hardness of the gear wheel tested in the video?

• 75 HRC

• 45 HRC

• 55 HRC

• 65 HRC