Rockwell test utilizes ___________ a measure of hardness.

• Load

• Depth of indentation

• Diameter of indentation

• Time of loading

A minor load of _________ is applied to seat the specimen in the Rockwell test.

• 1 kg

• 5 kg

• 10 kg

• 150 kg

What is a limitation of the Rockwell test?

• Slow speed

• Personal error

• Bigger size of indentation

• Different indenters

which of these used to test hardness?

• Rockwell TEST
• Izod impact test

Hardness of metal means that it is ...

• resistant to corrosion
• resistant to bending
• resistant to abrasion/permanent deformation
• resistant to rupture

which material is hardest

• Aluminium

• Copper

• Steel

What minimizes the amount of surface preparation in Rockwell test?

• Minor load

• Indenter surface

• Indenter geometry

• Heat-treatment

Hardened steel is tested on the C scale with ________ indenter and a _______ kg major load.

• 1.6 mm steel ball, 100

• Diamond, 150

• Diamond, 100

• 3.2 mm steel ball, 150

Which scale is used to test softer materials?

• A

• B

• C

• D

Which method of hardness test is most widely used?

• Brinell

• Rockwell

• Shore

• Vickers