Metrology 3

Resistance of the metal to plastic deformation usually by indentation is called

• Hardness
• structural change
• Tempering
• Quenching
• Text for option 5 (optional)

The major load used in rockwell C hardness test is

• 100kg
• 200kg
• 150kg
• 60kg

The major load used in rockwell B hardness test is

• 100kg
• 200kg
• 150kg
• 60kg

The indentor used in rockwell B hardness test is

• Diamond pyramid
• Diamond cone
• Hardened steel ball
• Diamond ball

The indentor used in rockwell C hardness test is

• Diamond pyramid
• Diamond cone
• Hardened steel ball
• Diamond ball

  Brinell method is used for

• soft material
• hard material
• non metal
• none

Brinell method impression made by

• steel ball
• plastic ball
• diamond cone
• none

HSS drill bit hardness checked by

• Brinell
• vicker
• rock
• all of the above

While checking hard material size of indenter is

• 360 ͦ
• 118 ͦ
• 112 ͦ
• 136 ͦ

Brass can be checked in rockwell

• B scale
• C scale
• D scale
• F scale